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  • Effects of sources and meteorology on particulate matter in the Western Mediterranean Basin: An overview of the DAURE campaign

     Pandolfi, Marco; Querol, Xavier; Alastuey, Andres; Jiménez, José-Luis; Jorba Casellas, Oriol; Day, D.; Ortega, A.; Cubison, M.J.; Comeron Tejero, Adolfo; Sicard, Michaël; Mohr, C.; Prévôt, A.S.H.; Minguillón, M.C.; Pey, Jorge; Baldasano Recio, Jose M.; Burkhart, J.F.; Seco, R.; Peñuelas, J.; van Drooge, B.L.; Artiñano, Begoña; Di Marco, C.; Nemitz, E.; Schallhart, S.; Metzger, A.; Hansel, A.; Lorente, J.; Ng, S.; Jayne, J.; Szidat, S.
    Journal of geophysical research: atmospheres
    Date of publication: 2014-04-27
    Journal article

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    DAURE (Determination of the Sources of Atmospheric Aerosols in Urban and Rural Environments in the Western Mediterranean) was a multidisciplinary international field campaign aimed at investigating the sources and meteorological controls of particulate matter in the Western Mediterranean Basin (WMB). Measurements were simultaneously performed at an urban-coastal (Barcelona, BCN) and a rural-elevated (Montseny, MSY) site pair in NE Spain during winter and summer. State-of-the-art methods such as 14C analysis, proton-transfer reaction mass spectrometry, and high-resolution aerosol mass spectrometry were applied for the first time in the WMB as part of DAURE. WMB regional pollution episodes were associated with high concentrations of inorganic and organic species formed during the transport to inland areas and built up at regional scales. Winter pollutants accumulation depended on the degree of regional stagnation of an air mass under anticyclonic conditions and the planetary boundary layer height. In summer, regional recirculation and biogenic secondary organic aerosols (SOA) formation mainly determined the regional pollutant concentrations. The contribution from fossil sources to organic carbon (OC) and elemental carbon (EC) and hydrocarbon-like organic aerosol concentrations were higher at BCN compared with MSY due to traffic emissions. The relative contribution of nonfossil OC was higher at MSY especially in summer due to biogenic emissions. The fossil OC/EC ratio at MSY was twice the corresponding ratio at BCN indicating that a substantial fraction of fossil OC was due to fossil SOA. In winter, BCN cooking emissions were identified as an important source of modern carbon in primary organic aerosol. Key Points Analysis of the sources and meteorological controls of PM in the WMB

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    Dimensionless parameterization of lidar for laser remote sensing of the atmosphere and its application to systems with SiPM and PMT detectors  Open access

     Agishev, Ravil R.; Comeron Tejero, Adolfo; Rodriguez Gomez, Alejandro Antonio; Sicard, Michaël
    Applied optics
    Date of publication: 2014-05-20
    Journal article

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    In this paper, we show a renewed approach to the generalized methodology for atmospheric lidar assessment, which uses the dimensionless parameterization as a core component. It is based on a series of our previous works where the problem of universal parameterization over many lidar technologies were described and analyzed from different points of view. The modernized dimensionless parameterization concept applied to relatively new silicon photomultiplier detectors (SiPMs) and traditional photomultiplier (PMT) detectors for remote-sensing instruments allowed predicting the lidar receiver performance with sky background available. The renewed approach can be widely used to evaluate a broad range of lidar system capabilities for a variety of lidar remote-sensing applications as well as to serve as a basis for selection of appropriate lidar system parameters for a specific application. Such a modernized methodology provides a generalized, uniform, and objective approach for evaluation of a broad range of lidar types and systems (aerosol, Raman, DIAL) operating on different targets (backscatter or topographic) and under intense sky background conditions. It can be used within the lidar community to compare different lidar instruments. (C) 2014 Optical Society of America

    In this paper, we show a renewed approach to the generalized methodology for atmospheric lidar assessment, which uses the dimensionless parameterization as a core component. It is based on a series of our previous works where the problem of universal parameterization over many lidar technologies were described and analyzed from different points of view. The modernized dimensionless parameterization concept applied to relatively new silicon photomultiplier detectors (SiPMs) and traditional photomultiplier (PMT) detectors for remote-sensing instruments allowed predicting the lidar receiver performance with sky background available. The renewed approach can be widely used to evaluate a broad range of lidar system capabilities for a variety of lidar remote-sensing applications as well as to serve as a basis for selection of appropriate lidar system parameters for a specific application. Such a modernized methodology provides a generalized, uniform, and objective approach for evaluation of a broad range of lidar types and systems (aerosol, Raman, DIAL) operating on different targets (backscatter or topographic) and under intense sky background conditions. It can be used within the lidar community to compare different lidar instruments. (C) 2014 Optical Society of America

  • Lidar with SiPM: some capabilities and limitations in real environment

     Agishev, Ravil; Comeron Tejero, Adolfo; Bach Aguilà, Jordi; Rodriguez Gomez, Alejandro Antonio; Sicard, Michaël; Riu Gras, Jordi; Royo, Santiago
    Optics and laser technology
    Date of publication: 2013-07
    Journal article

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    The purpose of the work is to demonstrate real capabilities and to give examples of SiPMs application in lidar technology in both analog and photon counting modes. The experimental research within an operating lidar complex adapted to implement the analog mode and photon counting measurements with subsequent inversions of atmospheric extinction and backscattering coefficients was conducted. Theoretical evaluations of potential limitations of atmospheric lidar by use of real day-time background parameters and features of SiPM-photodetectors studied experimentally were carried out with comparison of the extent of sensitivity decreasing for different detectors used and estimations of their operation range reduction.

    The purpose of the work is to demonstrate real capabilities and to give examples of SiPMs application in lidar technology in both analog and photon counting modes. The experimental research within an operating lidar complex adapted to implement the analog mode and photon counting measurements with subsequent inversions of atmospheric extinction and backscattering coefficients was conducted. Theoretical evaluations of potential limitations of atmospheric lidar by use of real day-time background parameters and features of SiPM-photodetectors studied experimentally were carried out with comparison of the extent of sensitivity decreasing for different detectors used and estimations of their operation range reduction.

  • Four-dimensional distribution of the 2010 Eyjafjallajökull volcanic cloud over Europe observed by EARLINET

     Pappalardo, Gelsomina; Mona, Lucia; D'Amico, Giuseppe; Wandinger, Ulla; Adam, Mariana; Amodeo, Aldo; Ansmann, Albert; Apituley, Arnoud; Alados Arboledas, Lucas; Balis, Dimitris; Bravo Aranda, J. A.; Chaikovsky, Anatoli; Comeron Tejero, Adolfo; Cuesta, J.; De Tomasi, Ferdinando; Freudenthaler, Volker; Gausa, Michael; Giannakaki, E.; Giehl, H.; Giunta, Aldo; Grigorov, I. Ivan; Gross, Silke; Haeffelin, M.; Hiebsch, Anja; Iarlori, M.; Lange, Diego; Linné, Holger; Madonna, Fabio; Mamouri, R.E.; Mattis, I.; McAuliffe, M. A. P.; Mitev, V.; Molero, Francisco; Navas Guzmán, Francisco; Nicolae, D.; Papayannis, Alexander; Perrone, Maria-Rita; Pietras, Christophe; Pietruczuk, Aleksander; Pisani, G.; Preissler, J.; Pujadas Cordero, Manuel; Rizi, Vicenzo; Ruth, A. A.; Schmidt, J.; Schnell, Franziska; Seifert, Patric; Serikov, I.; Sicard, Michaël; Simeonov, Valentin; Spinelli, N.; Stebel, K.; Tesche, M.; Trickl, Thomas; Wang, Xuan; Wagner, F.; Wiegner, M.; Wilson, K.
    Atmospheric chemistry and physics
    Date of publication: 2013-04-29
    Journal article

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    The eruption of the Icelandic volcano Eyjafjallajökull in April¿May 2010 represents a "natural experiment" to study the impact of volcanic emissions on a continental scale. For the first time, quantitative data about the presence, altitude, and layering of the volcanic cloud, in conjunction with optical information, are available for most parts of Europe derived from the observations by the European Aerosol Research Lidar NETwork (EARLINET). Based on multi-wavelength Raman lidar systems, EARLINET is the only instrument worldwide that is able to provide dense time series of high-quality optical data to be used for aerosol typing and for the retrieval of particle microphysical properties as a function of altitude. In this work we show the four-dimensional (4-D) distribution of the Eyjafjallajökull volcanic cloud in the troposphere over Europe as observed by EARLINET during the entire volcanic event (15 April¿26 May 2010). All optical properties directly measured (backscatter, extinction, and particle linear depolarization ratio) are stored in the EARLINET database available at http://www.earlinet.org. A specific relational database providing the volcanic mask over Europe, realized ad hoc for this specific event, has been developed and is available on request at http://www.earlinet.org. During the first days after the eruption, volcanic particles were detected over Central Europe within a wide range of altitudes, from the upper troposphere down to the local planetary boundary layer (PBL). After 19 April 2010, volcanic particles were detected over southern and south-eastern Europe. During the first half of May (5¿15 May), material emitted by the Eyjafjallajökull volcano was detected over Spain and Portugal and then over the Mediterranean and the Balkans. The last observations of the event were recorded until 25 May in Central Europe and in the Eastern Mediterranean area.

  • Wavelet correlation transform method and gradient method to determine aerosol layering from lidar returns: Some comments

     Comeron Tejero, Adolfo; Sicard, Michaël; Rocadenbosch Burillo, Francisco
    Journal of atmospheric and oceanic technology
    Date of publication: 2013-06
    Journal article

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    Identification of aerosol layers on lidar measurements is of interest to determine ranges where aerosol properties are likely to be homogeneous and to infer transport phenomena and atmosphere dynamics. For instance, the range-corrected backscattered signal from aerosol measured with lidars has long been used as a proxy to determine the depth of the planetary boundary layer. The method relies on the assumption that in a well-mixed atmosphere, a rather homogenous aerosol distribution will exist within the boundary layer; hence, a sudden drop in the lidar range-corrected signal profile will mark the end of the layer. The most usual methods to detect that drop are the gradient method, which detects a negative maximum in the derivative with respect to range of the lidar range-corrected signal, or of its logarithm, and the wavelet correlation transform method, which detects a maximum in the correlation function of the lidar range-corrected signal and a wavelet, usually the Haar wavelet. These methods are not restricted to determining the boundary layer height but can also be used to locate the edges of lofted aerosol layers. Using fundamentals of linear system theory, this study shows the deep link existing between the gradient method and the wavelet correlation transform method using the Haar wavelet, the latter being equivalent to the gradient method applied to a range-corrected signal profile smoothed by a low-pass spatial filtering, which seems not to have been explicitly noted in the literature so far. Consequences are readily drawn for the wavelet correlation transform method using other wavelets.

  • Daytime aerosol extinction profiles from the combination of CALIOP profiles and AERONET products

     Marcos, Carlos; Pedrós Esteban, Roberto; Gómez Amo, José Antonio; Sicard, Michaël; Utrillas Esteban, Maria Pilar; Muñoz Porcar, Constantino; Comeron Tejero, Adolfo; Martínez Lozano, José Antonio
    Atmospheric measurement techniques discussions
    Date of publication: 2013-04-24
    Journal article

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  • Analysis and design of an edge-technique-based Doppler wind lidar. Practical assessment of a laboratory prototype  Open access

     Muñoz Porcar, Constantino
    Defense's date: 2013-02-22
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    La tesi presentada constitueix la fase inicial en el desenvolupament d¿un lidar Doppler per a mesurar la velocitat del vent amb resolució en distància. Els lidars atmosfèrics emeten radiació làser polsada que després de ser dispersada per les molècules d¿aire i els aerosols en suspensió, és parcialment recollida per un telescopi, detectada per un fotorreceptor i analitzada per obtenir informació sobre l¿estat en que es troba la regió il¿luminada. La velocitat amb la que aquests elements es mouen respecte al instrument pot identificar-se amb la velocitat del vent. Aquesta pot mesurar-se per tant ¿i així ho han els lidars Doppler atmosfèrics¿¿ a partir de la detecció del desplaçament de freqüència que per efecte Doppler experimenta el senyal dispersat. L¿elecció de la tècnica de detecció utilitzada per a mesurar aquesta diferència de freqüència òptica ¿la denominada edge-technique¿¿ ha vingut determinada en aquest cas fonamentalment pel làser disponible, el emplaçament previst del sistema i per consideracions de simplicitat. En ella, la diferència de freqüència entre els polsos emesos i el senyal rebut s¿obté a partir de la mesura del canvi produït en la transmissió d¿un filtre òptic.En la primera part d¿aquest treball es proposa el disseny del filtre òptic encarregat de discriminar freqüències i un anàlisi detallada de les prestacions d¿un lidar Doppler per a la mesura de la velocitat del vent basat en la edge-technique operant a partir del senyal dispersat per els aerosols atmosfèrics. En primer lloc, s¿ha establert un mètode que permet calcular, utilitzant la precisió de les mesures com a indicador i el marge de velocitats a mesurar com a restricció, la configuració òptima del filtre òptic emprat, en aquest cas un interferòmetre Fabry-Perot. A continuació, la precisió, la resolució temporal, la resolució en distància i l¿exactitud de les mesures de velocitat són analitzades en detall en diferents entorns típics de mesura i avaluades comparativament en relació a l¿estat de l¿art. També s¿estudia l¿efecte que sobre els paràmetres de qualitat de les mesures de velocitat té el component interferent de retorn molecular que inevitablement és present al senyal d¿aerosols analitzat.La segona part de la tesi està dedicada al disseny, construcció i avaluació d¿un prototip de laboratori basat en la edge-technique. L¿objectiu d¿aquest desenvolupament és avaluar en condicions adequades la implementació de la tècnica seleccionada per a la mesura de la velocitat. Aquest muntatge preliminar permet tanmateix caracteritzar i ajustar el funcionament d¿alguns dels elements crítics que formaran part del lidar de vents, com el interferòmetre Fabry-Perot, el subsistema de control de sintonia de la cavitat (imprescindible per compensar les derives relatives de freqüència entre el làser i el filtre), els elements de guiat i condicionament dels feixos de llum, els mòduls detectors i amplificadors de senyals o les rutines de calibració i control del sistema i de processament de la informació. El prototip construït per tal d¿assolir aquests objectius mesura la velocitat de blancs sòlids utilitzant la emissió d¿un làser en règim d¿ona continua. Aquestes condicions d¿operació permeten, en aquesta fase preliminar, evitar algunes complicacions relacionades amb la utilització de senyals lidar atmosfèriques polsats: en primer lloc, es tracta de senyals de durada molt curta, la potència de la qual no és constant ni predicible; a més no és senzill obtenir valors independents de la velocitat del vent per tal d¿avaluar la qualitat de les mesures.

    This thesis is the initial stage in the development of a range-resolving Doppler wind lidar. Atmospheric lidars emit pulsed laser radiation that after being scattered by air molecules and suspended aerosol particles is partly collected by a telescope, detected by a photoreceiver and analyzed for obtaining information about the state of the illuminated region. The speed of these elements with respect the instrument can be identified with the speed of the wind and it can be therefore measured ¿and this is the way the Doppler wind lidars do it¿¿ from the detection of the frequency shift that due to Doppler effect is undergone by the scattered signal. The selection of the technique used to measure this optical frequency shift ¿the so-called edge-technique¿¿ has been determined in this case mainly by the available laser, the location of the site where the system will be placed and by simplicity considerations. With this technique, the frequency difference between the emitted pulses and the receiver signal is obtained by measuring the change produced in the transmission of an optical filter. In the first part of this work the design of the optical filter devoted to discriminate frequencies and a complete analysis of the performance of a Doppler wind lidar based on the edge-technique operating from the signal scattered by the atmospheric aerosols is proposed. In the first place, a method that permits to calculate, using the precision of the measurements as indicator and the range of measurable velocities as constraint, the best configuration of the optical filter used in the system, in this case a Fabry-Perot interferometer, has been established. Afterwards, the precision, the time resolution, the range resolution and the accuracy of the velocity measurements are analyzed with detail in different typical measuring scenarios and are compared with the performance of other systems currently in operation. Also, the effects on the quality parameters of the velocity measurements of the interfering molecular return component that is unavoidably present in the analyzed aerosol signal is studied. The second part of the thesis is devoted to the design, implementation and assessment of a laboratory prototype based on the edge-technique. The objective of this development is to assess in convenient conditions the implementation of the selected detection technique. This preliminary assembly also permits to characterize and adjust the operation of some of the critical elements and subsystems that will be part of the Doppler wind lidar, such as the Fabry-Perot interferometer, the cavity tuning control subsystem (essential to compensate the relative frequency drifts between the laser and the filter), the elements for guiding and conditioning the light beams, the signal detection and amplification modules or the routines for calibrating and controlling the system and for processing the information. The prototype implemented to achieve these objectives is designed to measure the speed of hard targets using a laser emitting in continuous-wave regime. These operating conditions allow avoiding some difficulties related with the use of pulsed atmospheric lidar signals: in the first place, their duration is very short and their power is neither constant nor predictable; furthermore, it is not easy to obtain independent values of the speed of the wind for assessing the quality of the measurements.

  • Observación lidar atmosférica multi-espectral, procesado de la señal y recuperación de productos de datos: red europea y cal/val de satélites

     Comeron Tejero, Adolfo; Sicard, Michaël; Muñoz Porcar, Constantino; Garcia Vizcaino, David; Lange, Diego; Frasier, Steve; Rocadenbosch Burillo, Francisco
    Participation in a competitive project

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  • Atmospheric aerosol measurement with a network of advanced lidar instruments

     Comeron Tejero, Adolfo; Sicard, Michaël; Rocadenbosch Burillo, Francisco; Muñoz Porcar, Constantino; Rodriguez Gomez, Alejandro Antonio; Garcia Vizcaino, David
    SPIE Newsroom
    Date of publication: 2013-03-11
    Journal article

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    A European network of atmosphere sensors uses multi-wavelength elastic-Raman lidar instruments in its infrastructure.

    A European network of atmosphere sensors uses multi-wavelength elastic-Raman lidar instruments in its infrastructure.

  • Estimation of a radiative transfer model in the longwave spectral range: sensitivity study and application to real cases

     Sicard, Michaël; Bertolin Martinez, Santiago; Mallet, Marc; Dubuisson, Philippe; Comeron Tejero, Adolfo
    Electro-Optical Remote Sensing, Photonic Technologies, and Applications; and Military Applications in Hyperspectral Imaging and High Spatial Resolution Sensing
    Presentation's date: 2013-09
    Presentation of work at congresses

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    The aerosol radiative effect in the longwave spectral range is often neglected in atmospheric aerosol forcing studies, hence very few researches are conducted in this field at local scale, and even less at regional scale. However, strong absorbing aerosols, like mineral dust, can have a small, but non-negligible heating effect in the longwave spectral range which can slightly counteract the aerosol cooling effect in the shortwave. The objective of this research is to perform a sensitivity study of an aerosol radiative transfer model as a function of dust particle properties. GAME model1, which can compute vertically resolved shortwave and longwave values of aerosol radiative forcing, is used. Before developing the sensitivity analysis, the aerosol radiative transfer model is validated by comparing its outputs with results published previously. Radiative forcing simulations in the longwave have shown an important sensitivity to the following parameters: aerosol size and refractive index, aerosol vertical distribution, humidity, surface temperature and albedo. A couple of strong mineral dust intrusion observed by means of lidar and sun-photometer are also presented in terms of shortwave and longwave radiative forcing.

  • Parameter design of a biaxial lidar ceilometer

     Gregorio López, Eduard; Rocadenbosch Burillo, Francisco; Tiana Alsina, Jordi; Comeron Tejero, Adolfo; Sanz Cortiella, Ricardo; Rosell Polo, Joan Ramon
    Journal of applied remote sensing
    Date of publication: 2012-07-11
    Journal article

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  • Study on aerosol properties over Madrid (Spain) by multiple instrumentation during SPALI10 lidar campaign

     Molero, Francisco; Sicard, Michaël; Navas Guzmán, Francisco; Preissler, J.; Freudenthaler, Volker; Fernández, J.A.; Amodeo, Aldo; Tomás Martinez, Sergio; Mattis, I.; Granados, M; Giunta, Aldo; Pujadas Cordero, Manuel; Lange, Diego; Wagner, F.; Comeron Tejero, Adolfo; Alados Arboledas, Lucas; Guerrero Rascado, Juan Luis; D'Amico, Giuseppe; Kumar, Dhiraj; Giner Nos, Joaquin Jose; Muñoz Porcar, Constantino; Rocadenbosch Burillo, Francisco; Pappalardo, Gelsomina
    Óptica pura y aplicada
    Date of publication: 2012-11-19
    Journal article

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    Cuatro sistemas lidar Raman multifrecuencia (Madrid, Granada, Barcelona y Evora), tomaron medidas simultáneamente a un sistema de referencia (Potenza) para verificar su funcionamiento durante la campaña de intercomparación: SPALI10, (SPAin Lidar Intercomparison 2010) que tuvo lugar en Madrid entre el 18 de Octubre y el 5 de Noviembre de 2010. Estos sistemas lidar Raman multifrecuencia proporcionan propiedades ópticas de los aerosoles con resolución vertical. Los perfiles suministrados por los sistemas lidar se compararon con información complementaria proporcionada por otra instrumentación, tal como la distribución de tamaños de los aerosoles medida de manera continua a nivel de superficie o la caracterización de la columna de aerosoles

  • Silicon photomultiplier detector for atmospheric lidar applications

     Riu Gras, Jordi; Sicard, Michaël; Royo Royo, Santiago; Comeron Tejero, Adolfo
    Optics letters
    Date of publication: 2012-04-01
    Journal article

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  • Track Detection in Railway Sidings Based on MEMS Gyroscope Sensors

     Broquetas Ibars, Antoni; Comeron Tejero, Adolfo; Gelonch Bosch, Antoni; Fuertes Armengol, José Mª; Castro, Jose Antonio; Felip, Damià; López, Miguel Angel; Pulido, Jose Antonio
    Sensors
    Date of publication: 2012-11-23
    Journal article

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  • Intense dust and extremely fresh biomass burning outbreak in Barcelona, Spain: Characterization of their optical properties and estimation of their direct radiative forcing

     Sicard, Michaël; Mallet, Maëlle; Garcia Vizcaino, David; Comeron Tejero, Adolfo; Rocadenbosch Burillo, Francisco; Dubuisson, P.; Muñoz Porcar, Constantino
    Environmental research letters
    Date of publication: 2012-07
    Journal article

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    Silicon photomultiplier for atmospheric lidar applications  Open access

     Riu Gras, Jordi; Sicard, Michaël; Royo Royo, Santiago; Comeron Tejero, Adolfo
    Optics letters
    Date of publication: 2012-01-31
    Journal article

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    The viability and performance of using a silicon photomultiplier (SiPM) in atmospheric lidar applications is experimentally compared against the well-established use of photomultiplier tubes. By using a modified lidar setup for simultaneous data acquisition of both types of sensors, we demonstrate that a SiPM can offer appropriate qualities for this specific application where the detection of fast, extremely low light pulses and large dynamic range signals are essential capabilities. The experimental results show that the SiPM has an appropriate behaviour offering suitable capabilities for elastic, backscatter aerosol lidars. To the best of our knowledge, this is the first study showing SiPM for atmospheric lidar applications.

    The viability and performance of using a silicon photomultiplier (SiPM) in atmospheric lidar applications is experimentally compared against the well-established use of photomultiplier tubes. By using a modified lidar setup for simultaneous data acquisition of both types of sensors, we demonstrate that a SiPM can offer appropriate qualities for this specific application where the detection of fast, extremely low light pulses and large dynamic range signals are essential capabilities. The experimental results show that the SiPM has an appropriate behaviour offering suitable capabilities for elastic, backscatter aerosol lidars. To the best of our knowledge, this is the first study showing SiPM for atmospheric lidar applications.

  • Participación española en ChArMEx (The Chemistry-Aerosol Mediterranean Experiment) ChArMEx-SP2

     Comeron Tejero, Adolfo; Baldasano Recio, Jose M.; Rocadenbosch Burillo, Francisco; Sicard, Michaël
    Participation in a competitive project

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  • Fotomultiplicador de silicio para aplicaciones de lidar atmosférico

     Riu Gras, Jordi; Sicard, Michaël; Royo Royo, Santiago; Comeron Tejero, Adolfo
    Reunión Nacional de Óptica
    Presentation of work at congresses

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  • Power budget and performance assessment for the RSLAB multispectral elastic/raman lidar system

     Kumar, Dhiraj; Lange, Diego; Rocadenbosch Burillo, Francisco; Tomas, Sergio; Sicard, Michaël; Muñoz Porcar, Constantino; Comeron Tejero, Adolfo
    IEEE International Geoscience and Remote Sensing Symposium
    Presentation's date: 2012
    Presentation of work at congresses

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    The need of a multi-spectral lidar has widely been experienced in last few years with a view to invert the optical and microphysical properties of aerosols and their impact on the climate change. As a part of the EARLINET-GALION objectives, a joint effort has already been made by the European Aerosol Research Lidar Network (EARLINET). The EARLINET advanced standard of 3+2-channel configuration for lidar instruments (3+2 standing for 3 elastic channels and 2 respective Raman channels) enables retrieval of aerosol microphysical properties. An overview of the new RSLAB 3+2+1 multispectral lidar system, therefore, is presented in terms of power budget estimation for all the reception channels and overall system performance, that is, signal-to-noise ratio (SNR) and maximum sounding range achieved.

  • Utilization of a field lens to improve the overlap function in lidar systems using optical fibers

     Comeron Tejero, Adolfo; Sicard, Michaël; Kumar, Dhiraj; Rocadenbosch Burillo, Francisco; Lange Vega, Diego
    International Laser Radar Conference
    Presentation's date: 2012-06-26
    Presentation of work at congresses

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  • Investigation of representativeness of CALIPSO aerosol optical properties products by EARLINET correlative measurements

     Mona, Lucia; Papagiannopoulos, N.; D'Amico, Giuseppe; Wandinger, Ulla; Giunta, Aldo; Hiebsch, Anja; Pappalardo, Gelsomina; Amodeo, Aldo; Apituley, Arnoud; Alados Arboledas, Lucas; Balis, Dimitris; Chaikovsky, Anatoli; Comeron Tejero, Adolfo; Freudenthaler, Volker; Papayannis, Alexander; Grigorov, I. Ivan; Iarlori, M.; Linné, Holger; Pietruczuk, Aleksander; De Tomasi, Ferdinando; Schnell, Franziska; Spinelli, N.; Wiegner, M.
    International Laser Radar Conference
    Presentation's date: 2012-06-28
    Presentation of work at congresses

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    The almost six-years long database of aerosol and cloud vertical profiles provided by CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) is at the present the longest database of aerosol optical properties at global scale. This database is a unique tool for the characterization of aerosol 4D distribution at global scale. However, CALIPSO has a small footprint and a revisiting time of 16 days, and therefore how well these measurements represent the atmospheric conditions of a surrounding area over a longer time is a big issue to be investigated. Because of its geographic coverage and the large number of advanced Raman aerosol lidars, EARLINET, the European Aerosol Research Lidar Network, offers a unique opportunity for the validation and full exploitation of the CALIPSO mission. CALIPSO Level 2 and Level 3 data products are investigated in terms of their representativeness by comparison with EARLINET measurements. Comparisons for the Level 2 profiles available in both version 2 (40 km as horizontal resolution) and version 3 (5 km) releases highlight the issue of finding a best compromise between the high resolution and the high signal-to-noise ratio. Representativeness of monthly averages provided in Level 3 data is investigated using EARLINET-CALIPSO correlative measurements. The study will furthermore benefit from the availability of the 12-years long-term database of EARLINET climatological data available from May 2000.

  • Seasonal variability of aerosol optical properties observed by means of a Raman lidar at an EARLINET site over Northeastern Spain

     Sicard, Michaël; Rocadenbosch Burillo, Francisco; Md. Reba, Mohd Nadzri; Comeron Tejero, Adolfo; Tomas Martinez, Sergio; Garcia Vizcaino, David; Batet Torrell, Oscar; Barrios Porras, Ricardo Alfonso; Kumar, Dhiraj; Baldasano Recio, Jose M.
    Atmospheric chemistry and physics
    Date of publication: 2011-01-11
    Journal article

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    Monitoring of the Eyjafjallajökull volcanic aerosol plume over the Iberian Peninsula by means of four EARLINET lidar stations  Open access

     Sicard, Michaël; Guerrero Rascado, Juan Luis; Navas Guzmán, Francisco; Preissler, J.; Molero, Francisco; Tomas Martinez, Sergio; Bravo Aranda, J. A.; Comeron Tejero, Adolfo; Rocadenbosch Burillo, Francisco; Wagner, F.; Pujadas Cordero, Manuel; Alados Arboledas, Lucas
    Atmospheric chemistry and physics discussions
    Date of publication: 2011
    Journal article

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    Lidar and sun-photometer measurements were performed intensively over the Iberian Peninsula (IP) during the eruption of Eyjafjallaj ¨ okull volcano (Iceland) in April–May 2010. The volcanic plume hit all the IP stations for the first time on 5 May 2010. A thorough study of the event is conducted for the period 5–8 May. Firstly the spatial and temporal evolution of the plume is described by means of lidar and sun-photometer measurements supported with backtrajectories. The volcanic aerosol layers observed over the IP were rather thin (< 1000 m) with a top height up to 11–12 km. The mean optical thicknesses associated to those layers were rather low (between 0.013 and 0.020 over the whole period). Punctually on 7 May the optical thickness reached peak values near 0.10. Secondly the volcanic aerosols are characterized in terms of extinction and backscatter coefficients, lidar ratios, A° ngstro¨m exponents and linear particle depolarization ratio. Lidar ratios at different sites varied between 30 and 50 sr without a marked spectral dependency. Similar extinction-related A° ngstro¨m exponents varying between 0.6 and 0.8 were observed at different sites. The temporal evolution of the backscatter-related A° ngstro¨m exponents points out a possible decrease of the volcanic particle size as the plume moves from west to east. Particle depolarization ratios on the order of 0.06–0.08 confirmed the coexistence of both ash and non-ash particles. Additionally profiles of mass concentration were obtained with a method using the opposite depolarizing effects of ash particles (strongly depolarizing) and non-ash particles (very weakly depolarizing), and sun-photometer observations. In Granada the ash mass concentration was found approximately 1.5 higher than that of non-ash particles, and probably did not exceed the value of 200 μgm−3 during the whole event.

  • SPALINET: The Spanish and Portuguese aerosol lidar network

     Sicard, Michaël; Pujadas Cordero, Manuel; Alados Arboledas, Lucas; Pedrós Esteban, Roberto; Díaz, Juan Pedro; Córdoba Jabonero, Carmen; Requena, Alberto; Comeron Tejero, Adolfo; Rocadenbosch Burillo, Francisco; Rodrigues, Jose António; Moreno, J. M.; Wagner, F.
    Óptica pura y aplicada
    Date of publication: 2011-02-01
    Journal article

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    To extend and reinforce the action of the European network EARLINET (supported by the EARLINET-ASOS European project), a network of Spanish and Portuguese aerosol lidars (SPALINET) was created. In the first three years of the project six out of the ten systems have been successfully intercompared, seven elastic algorithms and six Raman algorithms have also been validated. Now the network focuses on future scientific objectives aiming at performing coordinated measurements. This paper presents the scientific context and a description of the network, as well as the results from the first three years of activity.

  • Aerosol closure study by lidar, Sun photometry, and airborne optical counters during DAMOCLES filed campaign at El Arenosillo sounding station, Spain

     Guerrero-Rascado, Juan Luis; Andrey, J.; Sicard, Michaël; Comeron Tejero, Adolfo; Pujadas Cordero, Manuel; Molero, Francisco; Rocadenbosch Burillo, Francisco; Pedrós Esteban, Roberto; Serrano-Vargas, O.; Gil Ojeda, Manuel; Olmo, F. J.; Lyamani, H.; Navas Guzmán, Francisco; Alados Arboledas, Lucas
    Journal of geophysical research
    Date of publication: 2011-01-26
    Journal article

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  • Use of a field lens for improving the overlap function of a lidar system employing an optical fiber in the receiver assembly

     Comeron Tejero, Adolfo; Sicard, Michaël; Kumar, Dhiraj; Rocadenbosch Burillo, Francisco
    Applied optics
    Date of publication: 2011-10-01
    Journal article

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  • INVESTIGATION OF CONTINUOUS-WAVE RANGE-RESOLVED LIDAR SYSTEMS FOR GAS DETECTION AND CONCENTRATION MEASUREMENT

     Batet Torrell, Oscar
    Defense's date: 2011-07-27
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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  • Aerosols, Clouds and Trace Gases Research Infrastructure Network

     Rocadenbosch Burillo, Francisco; Sicard, Michaël; Muñoz Porcar, Constantino; Garcia Vizcaino, David; Rodriguez Gomez, Alejandro Antonio; Lange Vega, Diego; Kumar, Dhiraj; Comeron Tejero, Adolfo
    Participation in a competitive project

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    Six-channel polychromator design and implementation for the UPC elastic/Raman LIDAR  Open access

     Kumar, Dhiraj; Rocadenbosch Burillo, Francisco; Sicard, Michaël; Comeron Tejero, Adolfo; Lange, Diego; Muñoz, Constantino; Tomás, Sergio; Gregorio, Eduard
    SPIE International Symposium - Remote Sensing Europe
    Presentation's date: 2011-09-21
    Presentation of work at congresses

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    A 6-channel dichroic-based polychromator is presented as the spectrally selective unit for the U.P.C. elastic/Raman lidar. Light emission is made at 355-nm (ultraviolet, UV), 532-nm (visible, VIS) and 1064-nm (near infrared, NIR) wavelengths. In reception, the polychromator is the spectral separation unit that separates the laser backscattered composite return into 3 elastic (355, 532, 1064-nm wavelengths) and 3 Raman channels (386.7, 607.4 and 407.5-nm (water-vapor) wavelengths). The polychromator houses photo-multiplier tubes (PMT) for all the channels except for the NIR one, which is avalanche photodiode (APD) based. The optomechanical design uses 1-inch optics and Eurorack standards. The APD-based receiver uses a XY-axis translation/elevation micro-positioning stage due to its comparatively small active area and motorised neutral density filters are used in all PMT-based channels to avoid detector saturation. The design has been specially optimized to provide homogeneous spatial light distribution onto the photodetectors and good mechanical repeatability. All channels are acquired in mixed analog and photon-counting mode using Licel® transient recorders, which are controlled by means of a user friendly LabVIEW TM interface. The paper focuses on the main polychromator optical design parameters, that is, light collimation trade-offs, end-to-end transmissivity, net channel responsivity, light distribution and spot size onto the photodetectors. The polychromator along with the rest of the U.P.C. lidar system has successfully been tested during a recent lidar system intercomparison campaign carried out in Madrid (Spain) during Oct. 2010.

  • Optimised data-gluing method for mixed analog/photon-counting lidar signals

     Lange, Diego; Kumar, Dhiraj; Rocadenbosch Burillo, Francisco; Sicard, Michaël; Comeron Tejero, Adolfo
    Workshop on Lidar Measurements in Latin America
    Presentation's date: 2011-09-26
    Presentation of work at congresses

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    In atmospheric LIDAR (Light Detection and Ranging) remote sensing, the dynamic range of the return power signals can span up to five orders of magnitude. Modern acquisition systems such as those based on LicelTM transient recorders combine a dual acquisition mode in which the return signal is recorded simultaneously in both analog (analog-to-digital (AD) conversion) and photon-counting (PC) modes. Although both data records can be analyzed separately, their combination obtained through gluing gives the advantage of the high linearity of the AD conversion for high light-level signals (especially in the near range) and the high sensitivity of the PC mode for low light-level signals (in the far range). Recently, eruptions of volcanoes such as Eyjafjalla (Iceland) in 2010, Grímsvötn (Iceland Puyehue (Argentina) Nabro (Eritrea) and Mount Lokon (Indonesia) in 2011 have yielded emergency situations with a strong economical cost due to human evacuation and/or air traffic interruption. Volcanic aerosols are first injected in the troposphere and often reach the stratosphere where they can reside for several years. The mixed analog/photo-counting acquisition approach is particularly suitable for the detection of volcanic aerosols in both the troposphere (near/mid range) and the stratosphere (far range). In this line, a case study showing volcanic aerosols from the Nabro volcano (Eritrea, 2011) in the stratosphere and simultaneously Saharan dust in the troposphere over the multi-spectral Barcelona lidar station during the period 27 June ¿ 1 July 2011 is presented. The benefits of the proposed gluing technique will be shown through the comparison of analog, PC, and glued backscatter-coefficient time series. Existing gluing algorithms solve the fitting coefficients by matching both analog and PC data over a predefined spatial range (or equivalently, over a predefined upper and lower counting rate) depending on which kind of photodetector (usually a photomultiplier) is being used. In this work, an enhanced data-gluing formulation is presented. The method automatically finds the spatial range where both analog and PC signals are more similar based on Euclidian distance minimization over piece-wise range intervals along the whole acquisition spatial range.

  • FMCW lidar for multiple-target sounding

     Batet Torrell, Oscar; Dios Otin, Victor Federico; Comeron Tejero, Adolfo
    Proceedings of SPIE, the International Society for Optical Engineering
    Date of publication: 2010
    Journal article

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    Seasonal variability of aerosol optical properties observed by means of an elastic-Raman lidar over Northeastern Spain  Open access

     Sicard, Michaël; Md. Reba, Mohd Nadzri; Rocadenbosch Burillo, Francisco; Comeron Tejero, Adolfo; Tomás Martinez, Sergio; Garcia Vizcaino, David; Batet Torrell, Oscar; Barrios Porras, Ricardo Alfonso; Kumar, Dhiraj
    Atmospheric chemistry and physics discussions
    Date of publication: 2010-06-01
    Journal article

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    The annual and seasonal variability of aerosol optical properties observed by means of an elastic-Raman lidar over Northeastern Spain has been assessed. The lidar representativeness has first been checked against un-photometer measurements in terms of aerosol optical thickness. Then the annual cycle and the seasonal variability of the planetary boundary layer aerosol optical thickness and its fraction compared to the columnar optical thickness, the lidar ratio, the backscatter-related A° ngstro¨m exponent and the planetary boundary layer height have been analyzed and discussed. Winter and summer mean profiles of extinction, backscatter and lidar ratio retrieved with the Raman algorithm have been presented. The analysis shows the impact of most of the natural events (Saharan dust intrusions, wildfires, etc.) and meteorological situations (summer anticyclonic situation, the formation of the Iberian thermal low, winter longrange transport from North Europe and/or North America, re-circulation flows, etc.) occurring in the Barcelona area. A detail study of a special event including a combined intrusion of Saharan dust and biomass-burning particles has proven the suitability of combining nighttime Raman- and daytime pure elastic-inversions to discriminate spatially different types of aerosols and to follow their spatial and temporal evolution.

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    Practical analytical backscatter errorbars for the elastic one-component liar inversion algorithm  Open access

     Rocadenbosch Burillo, Francisco; Md. Reba, Mohd Nadzri; Sicard, Michaël; Comeron Tejero, Adolfo
    Applied optics
    Date of publication: 2010-06-10
    Journal article

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  • Intensity-modulated linear-frequency-modulated continuous-wave lidar for distributed media: fundamentals of technique

     Batet Torrell, Oscar; Dios Otin, Victor Federico; Comeron Tejero, Adolfo; Agishev, Ravil
    Applied optics
    Date of publication: 2010-06-10
    Journal article

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    We analyze the intensity-modulation frequency-modulated continuous-wave (FMCW) technique for lidar remote sensing in the context of its application to distributed media. The goal of the technique is the reproduction of the sounded-medium profile along the emission path. A conceptual analysis is carried out to show the problems the basic version of the method presents for this application. The principal point is the appearance of a bandpass filtering effect, which seems to hinder its use in this context. A modified version of the technique is proposed to overcome this problem. A number of computer simulations confirm the ability of the modified FMCW technique to sound distributed media.

  • Site-testing using an aerosol, backscatter lidar at the Roque de los Muchachos Observatory

     Sicard, Michaël; Md. Reba, Mohd Nadzri; Tomas Martinez, Sergio; Comeron Tejero, Adolfo; Batet Torrell, Oscar; Muñoz Porcar, Constantino; Rodriguez Gomez, Alejandro Antonio; Rocadenbosch Burillo, Francisco; Muñoz Tuñón, Casiana; Jiménez Fuensalida, Jesús
    Monthly notices of the Royal Astronomical Society
    Date of publication: 2010-06-01
    Journal article

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  • Lidar measurements of wind velocity fields

     Comeron Tejero, Adolfo; Muñoz Porcar, Constantino; Rocadenbosch Burillo, Francisco; Rodriguez Gomez, Alejandro Antonio; Sicard, Michaël; Tomas Martinez, Sergio
    Date of publication: 2010
    Book chapter

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  • LIDARES ELASTICO-RAMAN: Integracion,procesado de datos y explotacion

     Comeron Tejero, Adolfo; Muñoz Porcar, Constantino; Sicard, Michaël; Garcia Vizcaino, David; Tomas Martinez, Sergio; Kumar, Dhiraj; Lange Vega, Diego; Rocadenbosch Burillo, Francisco
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  • Unmanned unattended LIDAR (radar laser) station

     Comeron Tejero, Adolfo; Muñoz Porcar, Constantino; Sicard, Michaël; Garcia Vizcaino, David; Rocadenbosch Burillo, Francisco
    Participation in a competitive project

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  • Participación Española en Charmex (The Chemistry-Aerosol Mediterranean Experiment)

     Comeron Tejero, Adolfo; Baldasano Recio, Jose M.; Rocadenbosch Burillo, Francisco; Sicard, Michaël
    Participation in a competitive project

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    Monitoring of the Eyjafjalla volcanic plume at four lidar stations over the Iberian Peninsula: 6 to 8 May 2010  Open access

     Guerrero Rascado, Juan Luis; Sicard, Michaël; Navas Guzmán, Francisco; Preissler, J.; Kumar, Dhiraj; Bravo Aranda, J. A.; Molero, Francisco; Tomás, S.; Md. Reba, Mohd Nadzri; Alados Arboledas, Lucas; Comeron Tejero, Adolfo; Pujadas Cordero, Manuel; Rocadenbosch Burillo, Francisco; Silva, A. M.; Wagner, F.
    Reunión Española de Ciencia y Tecnología de Aerosoles
    Presentation's date: 2010-06
    Presentation of work at congresses

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    Lidar measurements were performed in the framework of the EARLINET and SPALINET networks during the eruption of Eyjafjalla volcano (Iceland) since 14 April 2010. The profiles of the aerosol optical properties, namely backscatter and extinction coefficients, lidar ratio and Angström exponent, show the presence of volcanic aerosol layers over all SPALINET stations since 5 May. The volcanic particles were monitored both within the planetary boundary layer and in decoupled layers up to 8 km agl over the Iberian Peninsula. This is the first time that the spatial and temporal distributions of volcanic aerosols have been studied with active remote sensing techniques over the Iberian Peninsula.

  • FMCW lidar for multiple target sounding

     Batet Torrell, Oscar; Dios Otin, Victor Federico; Comeron Tejero, Adolfo
    Remote Sensing System Engineering
    Presentation's date: 2010-08-02
    Presentation of work at congresses

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    Continuous-Wave lidars are constantly evolving in order to achieve the best performances with low power and low cost. Frequency-modulated continuous-wave (FMCW) lidar is a well-known type of lidar used for solid-target detection and ranging with high spatial resolution. The extension of this lidar technique to the probing of distributed media (aerosols, smoke or exhaust fumes) has recently been proposed by the authors. The main drawback in measuring extended or distributed targets with a conventional FMCW signal is the loss of information that occurs in the retrieved signal, as it suffers a bandpass filtering in the detection process. This implies the practical impossibility of recovering the complete information about the target spatial distribution. A shift of the sub-carrier FM modulating signal to baseband can avoid these effects and the desired information can be satisfactorily retrieved if the emitted signal is adequately chosen to avoid sum-frequency components distortion. A theoretical formulation has been developed and tested by sounding a distributed medium composed of two narrow solid targets, which is analyzed in different configurations by changing the distance among them. The medium is probed with both the classical sub-carrier FM bandpass signal and with the baseband one previously proposed. The experimental results are compared with the corresponding simulations in order to assess them.

  • EARLINET observations of the Eyjafjallajökull ash plume over Europe

     Pappalardo, Gelsomina; Comeron Tejero, Adolfo; Sicard, Michaël
    Remote Sensing for Agriculture, Ecosystems, and Hydrology
    Presentation's date: 2010-09-20
    Presentation of work at congresses

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    EARLINET, the European Aerosol Research Lidar NETwork, established in 2000, is the first coordinated lidar network for tropospheric aerosol study on the continental scale. The network activity is based on scheduled measurements, a rigorous quality assurance program addressing both instruments and evaluation algorithms, and a standardised data exchange format. At present, the network includes 27 lidar stations distributed over Europe. EARLINET performed almost continuous measurements since 15 April 2010 in order to follow the evolution of the volcanic plume generated from the eruption of the Eyjafjallajökull volcano, providing the 4-dimensional distribution of the volcanic ash plume over Europe. During the 15-30 April period, volcanic particles were detected over Central Europe over a wide range of altitudes, from 10 km down to the local planetary boundary layer (PBL). Until 19 April, the volcanic plume transport toward South Europe was nearly completely blocked by the Alps. After 19 April volcanic particles were transported to the south and the southeast of Europe. Descending aerosol layers were typically observed all over Europe and intrusion of particles into the PBL was observed at almost each lidar site that was affected by the volcanic plume. A second event was observed over Portugal and Spain (6 May) and then over Italy on 9 May 2010. The volcanic plume was then observed again over Southern Germany on 11 May 2010. rigorous quality assurance program addressing both instruments and evaluation algorithms, and a standardised data exchange format. At present, the network includes 27 lidar stations distributed over Europe. EARLINET performed almost continuous measurements since 15 April 2010 in order to follow the evolution of the volcanic plume generated from the eruption of the Eyjafjallajökull volcano, providing the 4-dimensional distribution of the volcanic ash plume over Europe. During the 15-30 April period, volcanic particles were detected over Central Europe over a wide range of altitudes, from 10 km down to the local planetary boundary layer (PBL). Until 19 April, the volcanic plume transport toward South Europe was nearly completely blocked by the Alps. After 19 April volcanic particles were transported to the south and the southeast of Europe. Descending aerosol layers were typically observed all over Europe and intrusion of particles into the PBL was observed at almost each lidar site that was affected by the volcanic plume. A second event was observed over Portugal and Spain (6 May) and then over Italy on 9 May 2010. The volcanic plume was then observed again over Southern Germany on 11 May 2010.

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    Representativeness of aerosol measurements: EARLINET-CALIPSO correlative study  Open access

     Pappalardo, Gelsomina; Mona, Lucia; Hiebsch, Anja; Wandinger, Ulla; Apituley, Arnoud; Linné, Holger; Alados Arboledas, Lucas; Balis, Dimitris; Comeron Tejero, Adolfo; Freudenthaler, Volker; Giannakaki, E.; Giunta, Aldo; Guerrero, J. L.; Madonna, Fabio; Mamouri, R.E.; Mattis, I.; Papayannis, Alexander; Pujadas Cordero, Manuel; Rocadenbosch Burillo, Francisco; Spinelli, N.; Wang, Xuan; Wiegner, M.
    International Laser Radar Conference
    Presentation's date: 2010-07
    Presentation of work at congresses

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    The high variability of tropospheric aerosols, both in space and time, is the main cause of the high uncertainty about radiative forcing related to tropospheric aerosols and their interaction with clouds. Because of the lack of high resolution aerosol global vertical profiles, the vertical mixing has not been considered so far in studies of spatial and temporal variability. The CALIPSO mission provides the first opportunity to investigate the 4-D aerosol and cloud fields in detail. However, because of the CALIOP small footprint and the revisit time of 16 days, correlative ground-based lidar observations are necessary in order to investigate the representativeness of these satellite observations. EARLINET, the European Aerosol Research Lidar Network, started correlative measurements for CALIPSO in June 2006, right after the CALIPSO launch. An integrated study of CALIPSO and EARLINET correlative measurements opens new possibilities for spatial (both horizontal and vertical) and temporal representativeness investigation of polar-orbit satellite measurements also in terms of revisit time.

  • Seguimiento de las cenizas del Eyjafjalla sobre la Península Ibérica por la red de lidares hispano-portuguesa SPALINET

     Sicard, Michaël; Kumar, Dhiraj; Tomas Martinez, Sergio; Comeron Tejero, Adolfo; Rocadenbosch Burillo, Francisco; Guerrero-Rascado, Juan Luis; Molero, Francisco; Preissler, J.; Silva, A.M.; Navas Guzmán, Francisco; Pujadas Cordero, Manuel; Bravo Aranda, J. A.; Alados Arboledas, Lucas; Wagner, F.; Bolarín, Jose Miguel; Requena, Alberto
    Congreso Nacional del Medio Ambiente
    Presentation's date: 2010-11-22
    Presentation of work at congresses

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    La reciente erupción del volcán Eyjafjallajökull es una muestra – extremada, pero de probabilidad no despreciable – de la influencia que los aerosoles atmosféricos pueden tener en la vida diaria de miles de personas y en la economía mundial. Este acontecimiento ha sido seguido desde tierra por – entre otros instrumentos – radares láser (lidares) que han permitido determinar la evolución en el espacio y el tiempo de las nubes de ceniza proyectadas por el volcán y han proporcionado información de valor a las agencias meteorológicas y a las administraciones responsables de la seguridad de la navegación aérea.

  • Dispersion and evolution of the Eyjafjallajökull ash plume over Europe: vertically resolved measurements with the European LIDAR network EARLINET

     Pappalardo, Gelsomina; Mona, Lucia; Alados Arboledas, Lucas; Amodeo, Aldo; Ansmann, Albert; Balis, Dimitris; Apituley, Arnoud; Bellantone, V.; Böckmann, C.; Bravo Aranda, J. A.; Burlizzi, P.; Chaikovsky, Anatoli; Comeron Tejero, Adolfo; Cuesta, J.; D'Amico, Giuseppe; De Graaf, M.; De Tomasi, Ferdinando; Donovan, D.; Freudenthaler, Volker; Gasteiger, J.; Gausa, Michael; Giannakaki, E.; Giehl, H.; Giunta, Aldo; Grigorov, I. Ivan; Gross, S.; Gustavsson, O.; Haeffelin, M.; Heese, B.; Hiebsch, Anja; Iarlori, M.; Kinne, S.; Kolarov, George V.; Linné, Holger; Mamouri, R.E.; Madonna, Fabio; Mattis, I.; Mitev, V.; Molero, Francisco; Müller, D.; Navas Guzmán, Francisco; Nemuc, A.; Nicolae, D.; Osterloh, L.; Persson, R.; Pietruczuk, Aleksander; Podgorsky, J.; Preissler, J.; Pujadas, M.; Putaud, J. P.; Ravetta, F.; Rizi, Vicenzo; Rocadenbosch Burillo, Francisco; Schmidt, J.; Papayannis, Alexander; Perrone, Maria-Rita; Pisani, G.; Seifert, Patric; Serikov, I.; Sicard, Michaël; Silva, A. M.; Simeonov, Valentin; Spinelli, N.; Stebel, K.; Stoyanov, Dimitar Vassilev; Tafuro, A.; Tesche, M.; Trickl, Thomas; Wagner, F.; Wandinger, Ulla; Wang, Xuan; Wiegner, M.; Wilson, K.
    European Geosciences Union General Assembly
    Presentation's date: 2010-05
    Presentation of work at congresses

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    Aerosol lidar intercomparison in the framework of SPALINET-The Spanish lidar network: methodology and results  Open access

     Sicard, Michaël; Guerrero, Juan Luis; Pedros, Roberto; Molero, Francisco; Exposito, Francisco Javier; Córdoba Jabonero, Carmen; Bolarín, Jose Miguel; Comeron Tejero, Adolfo; Rocadenbosch Burillo, Francisco; Pujades, Manuel; Alados Arboledas, Lucas; Martínez Lozano, José Antonio; Pedro Diaz, Juan; Gil Ojeda, Manuel; Requena, Alberto; Navas Guzmán, Francisco; Moreno, Jose Maria
    IEEE transactions on geoscience and remote sensing
    Date of publication: 2009-10
    Journal article

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    Abstract—A group of eight Spanish lidars was formed in order to extend the European Aerosol Research Lidar Network–Advanced Sustainable Observation System (EARLINET-ASOS)project. This study presents intercomparisons at the hardware and software levels. Results of the system intercomparisons are based on range-square-corrected signals in cases where the lidars viewed the same atmospheres. Comparisons were also made for aeros backscatter coefficients at 1064 nm (2 systems) and 532 nm (all systems), and for extinction coefficients at 532 nm (2 systems). In total, three field campaigns were carried out between 2006 and 2007. Comparisons were limited to the highest layer found before the free troposphere, i.e., either the atmospheric boundary layer or the aerosol layer just above it. Some groups did not pass the quality assurance criterion on the first attempt. Following modification and improvement to these systems, all systems met the quality criterion. The backscatter algorithm intercomparison consisted of processing lidar signal profiles simulated for two types of atmospheric conditions. Three stages with increasing knowledge of the input parameters were considered. The results showed that all algorithms work well when all inputs are known. They also showed the necessity to perform, when possible, additional measurements to attain better estimation of the lidar ratio, which is the most critical unknown in the elastic lidar inversion.

  • EARLINET: the European Aerosol Research Lidar Network for the Aerosol Climatology on Continental Scale

     Pappalardo, Gelsomina; Bosenberg, J; Amodeo, Aldo; Ansmann, Albert; Apituley, Arnoud; Alados, L; Balis, Dimitrios; Bockmann, C; Chaikovsky, A; Comeron Tejero, Adolfo; D'Amico, Giuseppe; Freudenthaler, V; Grigorov, I [et al]
    AIP Conference proceedings
    Date of publication: 2009-03
    Journal article

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  • Optical ground station: requirements and design, bidirectional link model and performance

     Reyes García-Talavera, Marcos; Sodnik, Zoran; Comeron Tejero, Adolfo
    Date of publication: 2009
    Book chapter

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  • GRUP DE FOTONICA

     Belmonte Molina, Aniceto; Dios Otin, Victor Federico; Sicard, Michaël; Rocadenbosch Burillo, Francisco; Muñoz Porcar, Constantino; Hernandez Marco, Jordi; Garcia Vizcaino, David; Garcia Mateos, Jorge; Rodriguez Gomez, Alejandro Antonio; Batet Torrell, Oscar; Barrios Porras, Ricardo Alfonso; Kartashov, Yaroslav V.; Torner Sabata, Lluis; Canal Bienzobas, Fernando; Tomas Martinez, Sergio; Comeron Tejero, Adolfo
    Participation in a competitive project

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