14 results on '"Siomos, Nikos"'
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2. The ESA-EVE Polarization Lidar for Assessing the Aeolus Aerosol Product Perfomance
- Author
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Paschou Peristera, Proestakis Emmanouil, Tsekeri Alexandra, Siomos Nikos, Gkikas Antonis, Gialitaki Anna, Marinou Eleni, Binietoglou Ioannis, Meleti Charikleia, Freudenthaler Volker, Georgoussis George, Doxastakis George, Louri-das Alexandros, Von Bismarck Jonas, and Amiridis Vassilis
- Subjects
Physics ,QC1-999 - Abstract
We present the EVE lidar concept, a combined linear/circular polarization system, tailored to evaluate the spaceborne ALADIN Doppler lidar system aerosol retrievals. EVE, currently under development, aims to provide the ESA-Aeolus mission with a flexible, mobile reference ground-based lidar system capable of providing well-characterized fiducial reference measurements of aerosol optical properties. Since ALADIN detects only the co-polar component of the backscattered circularly polarized radiation, a portion of the received radiation gets lost, leading to an un-derestimation of the backscatter coefficient and the circular depolarization ratio in strongly depolarizing scenes with non-spherical particles. The main focus of the new EVE lidar is to quantify these uncertainties and to evaluate aerosol backscatter/extinction retrievals for Aeolus, and later also for EarthCARE product validation, quality assessment and improvement.
- Published
- 2020
- Full Text
- View/download PDF
3. An Overview of the ASKOS Campaign in Cabo Verde.
- Author
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Marinou, Eleni, Paschou, Peristera, Tsikoudi, Ioanna, Tsekeri, Alexandra, Daskalopoulou, Vasiliki, Kouklaki, Dimitra, Siomos, Nikos, Spanakis-Misirlis, Vasileios, Voudouri, Kalliopi Artemis, Georgiou, Thanasis, Drakaki, Eleni, Kampouri, Anna, Papachristopoulou, Kyriaki, Mavropoulou, Ioanna, Mallios, Sotiris, Proestakis, Emmanouil, Gkikas, Antonis, Koutsoupi, Iliana, Raptis, Ioannis Panagiotis, and Kazadzis, Stelios
- Subjects
DUST ,LIDAR ,REMOTE sensing ,SUMMER - Abstract
In the framework of the ESA-NASA Joint Aeolus Tropical Atlantic Campaign (JATAC), the ASKOS experiment was implemented during the summer and autumn of 2021 and 2022. ASKOS comprised roughly 9 weeks of measurements in the Saharan dust outflow towards the North Atlantic, with operations conducted from the Cabo Verde Islands. Through its unprecedented dataset of synergistic measurements in the region, ASKOS will allow for the calibration and validation of the aerosol/cloud product from Aeolus and the preparation of the terrain for EarthCARE cal/val activities. Moreover, ASKOS marks a turning point in our ability to study Saharan dust properties and the processes affecting its atmospheric transport, as well as the link to other components of the Earth's system, such as the effect of dust particles on cloud formation over the Eastern Atlantic and the effect of large and giant particles on radiation. This is possible through the synergy of diverse observations acquired during the experiment, which include intense 24/7 ground-based aerosol, cloud, wind, and radiation remote sensing measurements, and UAV-based aerosol in situ measurements within the Saharan air layer, up to 5.3 km altitude, offering particle size-distributions up to 40 µm as well as sample collection for mineralogical analysis. We provide an outline of the novel measurements along with the main scientific objectives of ASKOS. The campaign data will be publicly available by September of 2023 through the EVDC portal (ESA Validation Data Center). [ABSTRACT FROM AUTHOR]
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- 2023
- Full Text
- View/download PDF
4. The Joint Aeolus Tropical Atlantic Campaign - First Results for Aeolus Calibration/Validation and Science in the Tropics
- Author
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Skofronick-Jackson, Gail, Fehr, Thorsten, Althausen, Dietrich, Amiridis, Vassilis, Baars, Holger, von Bismarck, Jonas, Borne, Maurus, Casal, Tânia, Cazenave, Quitterie, Chen, Shuyi, Engelmann, Ronny, Flamant, Cyrille, Gaetani, Marco, Geiß, Alexander, Gómez Maqueo Anaya, Sofia, Knipperz, Peter, Kollias, Pavlos, Koopman, Rob, Krisna, Trismono, Lemmerz, Christian, Lux, Oliver, Marinou, Eleni, Marksteiner, Uwe, Močnik, Griša, Nemuc, Anca, Parrinello, Tommaso, Paschou, Peristera, Piña, Aaron, Pirloaga, Razvan, Rahm, Stephan, Reitebuch, Oliver, Schäfler, Andreas, Siomos, Nikos, Skupin, Annett, Straume, Anne, Tran, Viet, Vaziri, Pouya, Wandinger, Ulla, Wehr, Tobias, Weiler, Fabian, Wernham, Denny, Witschas, Benjamin, Zenk, Cordula, Cardon, Catherine, NASA Science Mission Directorate (SMD), NASA, European Space Research and Technology Centre (ESTEC), European Space Agency (ESA), Leibniz Institute for Tropospheric Research (TROPOS), Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing [Penteli] (IAASARS), National Observatory of Athens (NOA), European Space Research Institute (ESRIN), Karlsruhe Institute of Technology (KIT), TROPO - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Department of Atmospheric Sciences [Seattle], University of Washington [Seattle], Istituto Universitario di Studi Superiori (IUSS), DLR Institut für Physik der Atmosphäre (IPA), Deutsches Zentrum für Luft- und Raumfahrt [Oberpfaffenhofen-Wessling] (DLR), University of Nova Gorica, National Institute of Research and Development for Optoelectronics (INOE), Agence Spatiale Européenne (ESA), and Helmholtz Centre for Ocean Research [Kiel] (GEOMAR)
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[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] ,[PHYS.PHYS.PHYS-AO-PH] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] - Abstract
International audience; ESA’s Aeolus satellite observations are expected to have the biggest impact for the improvement of numerical weather prediction in the Tropics. An especially important case relating to the evolution, dynamics, and predictability of tropical weather systems is the outflow of Saharan dust, its interaction with cloud microphysics and impact on the development of tropical storms over the Atlantic Ocean. The Atlantic Ocean off the coast of West Africa and the eastern Caribbean uniquely allows the study of the Saharan Aerosol layer, African Easterly Waves and Jet, Tropical Easterly Jet, as well as the deep convection in the Intertropical Convergence Zone and their relation to the formation of convective systems, and the long-range transport of dust and its impact on air quality. The Joint Aeolus Tropical Atlantic Campaign (JATAC) deployed on Cabo Verde and the US Virgin Islands is addressing the validation and preparation of the ESA missions Aeolus, EarthCARE and WIVERN, as well as supporting the related science objectives raised above. The JATAC campaign started in July 2021 with the deployment of ground-based instruments at the Ocean Science Center Mindelo (OSCM, Cabo Verde), including the EVE lidar, the PollyXT lidar, a W-band Doppler cloud radar and a sunphotometer. By mid-August, the CPEX-AW campaign started their operations from the US Virgin Islands with NASA’s DC-8 flying laboratory in the Western Tropical Atlantic and Caribbean with the Doppler Aerosol Wind Lidar (DAWN), Airborne Precipitation and Cloud Radar (APR-3), the Water Vapor DIAL and HSRL (HALO), a microwave sounder (HAMSR) and dropsondes. In September, a European aircraft fleet was deployed to Sal (Cabo Verde) with the DLR Falcon-20 carrying the Aeolus Airborne Demonstrator (A2D) and the 2-µm Doppler wind lidar, and the Safire Falcon-20 carrying the high-spectral-resolution Doppler lidar (LNG), the RASTA Doppler cloud radar, in-situ cloud and aerosol instruments among others. The Aerovizija Advantic WT-10 light aircraft with filter-photometers and nephelometers for in-situ aerosol characterisation was operating in close coordination with the ground-based observations from Mindelo. More than 35 flights of the four aircraft were performed. 17 Aeolus orbits were underflown, four of which completed by simultaneous observations of three aircraft, with a perfect collocation of Aeolus and the ground-based observation for two cases. Several flights by the NASA DC-8 and the Safire Falcon-20 have been dedicated to cloud microphysics and dust events. The EVE lidar has been operating on a regular basis, while the PollyXT and several other ground-based instruments were continuously operating during the campaign period. For further characterisation of the atmosphere, radiosondes were launched up to twice daily from Sal airport. Additionally, there were radiosonde launches from western Puerto Rico and northern St Croix, US Virgin Islands. The JATAC was supported by dedicated numerical weather and dust simulations supporting the forecasting efforts needed for successful planning of the flights and addressing open science questions. While the airborne activities were completed end September, the ground-based observations are continuing into 2022. The paper will present an overview and initial results of JATAC. In memory of our colleague and friend Gail.
- Published
- 2021
5. Biomass burning events measured by lidars in EARLINET. Part II. Results and discussions
- Author
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Adam, Mariana, primary, Nicolae, Doina, additional, Belegante, Livio, additional, Stachlewska, Iwona S., additional, Janicka, Lucja, additional, Szczepanik, Dominika, additional, Mylonaki, Maria, additional, Papanikolaou, Christiana Anna, additional, Siomos, Nikos, additional, Voudouri, Kalliopi Artemis, additional, Alados-Arboledas, Luca, additional, Bravo-Aranda, Juan Antonio, additional, Apituley, Arnoud, additional, Papagiannopoulos, Nikolaos, additional, Mona, Lucia, additional, Mattis, Ina, additional, Chaikovsky, Anatoli, additional, Sicard, Michaël, additional, Muñoz-Porcar, Constantino, additional, Pietruczuk, Aleksander, additional, Bortoli, Daniele, additional, Baars, Holger, additional, Grigorov, Ivan, additional, and Peshev, Zahary, additional
- Published
- 2020
- Full Text
- View/download PDF
6. Supplementary material to "Biomass burning events measured by lidars in EARLINET. Part II. Results and discussions"
- Author
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Adam, Mariana, primary, Nicolae, Doina, additional, Belegante, Livio, additional, Stachlewska, Iwona S., additional, Janicka, Lucja, additional, Szczepanik, Dominika, additional, Mylonaki, Maria, additional, Papanikolaou, Christiana Anna, additional, Siomos, Nikos, additional, Voudouri, Kalliopi Artemis, additional, Alados-Arboledas, Luca, additional, Bravo-Aranda, Juan Antonio, additional, Apituley, Arnoud, additional, Papagiannopoulos, Nikolaos, additional, Mona, Lucia, additional, Mattis, Ina, additional, Chaikovsky, Anatoli, additional, Sicard, Michaël, additional, Muñoz-Porcar, Constantino, additional, Pietruczuk, Aleksander, additional, Bortoli, Daniele, additional, Baars, Holger, additional, Grigorov, Ivan, additional, and Peshev, Zahary, additional
- Published
- 2020
- Full Text
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7. The ESA-EVE Polarization Lidar for Assessing the Aeolus Aerosol Product Perfomance.
- Author
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Liu, D., Wang, Y., Wu, Y., Gross, B., Moshary, F., Paschou, Peristera, Proestakis, Emmanouil, Tsekeri, Alexandra, Siomos, Nikos, Gkikas, Antonis, Gialitaki, Anna, Marinou, Eleni, Binietoglou, Ioannis, Meleti, Charikleia, Freudenthaler, Volker, Georgoussis, George, Doxastakis, George, Louri-das, Alexandros, Von Bismarck, Jonas, and Amiridis, Vassilis
- Subjects
DOPPLER lidar ,AEROSOLS ,UNCERTAINTY ,BACKSCATTERING - Abstract
We present the EVE lidar concept, a combined linear/circular polarization system, tailored to evaluate the spaceborne ALADIN Doppler lidar system aerosol retrievals. EVE, currently under development, aims to provide the ESA-Aeolus mission with a flexible, mobile reference ground-based lidar system capable of providing well-characterized fiducial reference measurements of aerosol optical properties. Since ALADIN detects only the co-polar component of the backscattered circularly polarized radiation, a portion of the received radiation gets lost, leading to an un-derestimation of the backscatter coefficient and the circular depolarization ratio in strongly depolarizing scenes with non-spherical particles. The main focus of the new EVE lidar is to quantify these uncertainties and to evaluate aerosol backscatter/extinction retrievals for Aeolus, and later also for EarthCARE product validation, quality assessment and improvement. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
8. Advancing the remote sensing of desert dust
- Author
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Amiridis, Vassilis, primary, Tsekeri, Alexandra, additional, Marinou, Eleni, additional, Proestakis, Emmanouil, additional, Gkikas, Antonis, additional, Gialitaki, Anna, additional, Daskalopoulou, Vassiliki, additional, Paschou, Peristera, additional, Siomos, Nikos, additional, Binietoglou, Ioannis, additional, Gasteiger, Josef, additional, Freudenthaler, Volker, additional, Mamouri, Rodanthi-Elisavet, additional, Ansmann, Albert, additional, and Mona, Lucia, additional
- Published
- 2019
- Full Text
- View/download PDF
9. Biomass burning events measured by lidars in EARLINET. Part II. Results and discussions.
- Author
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Adam, Mariana, Nicolae, Doina, Belegante, Livio, Stachlewska, Iwona S., Janicka, Lucja, Szczepanik, Dominika, Mylonaki, Maria, Papanikolaou, Christiana Anna, Siomos, Nikos, Artemis Voudouri, Kalliopi, Alados-Arboledas, Luca, Bravo-Aranda, Juan Antonio, Apituley, Arnoud, Papagiannopoulos, Nikolaos, Mona, Lucia, Mattis, Ina, Chaikovsky, Anatoli, Sicard, Michaël, Muñoz-Porcar, Constantino, and Pietruczuk, Aleksander
- Abstract
Biomass burning events are analysed using the European Aerosol Research Lidar Network database for atmospheric profiling of aerosols by lidars. Atmospheric profiles containing forest fires layers were identified in data collected by fourteen stations during 2008-2017. The data ranged from complete data sets (particle backscatter coefficient, extinction coefficient and linear depolarization ratio) to single profiles (particle backscatter coefficient). The data analysis methodology was described in Part I (Biomass burning events measured by lidars in EARLINET. Part I. Data analysis methodology, under discussions to ACP, the EARLINET special issue). The results are analysed by means of intensive parameters in three directions: (I) common biomass burning source (fire) recorded by at least two stations, (II) long range transport of smoke particles from North America (here, we divided the events into pure North America and mixed-North America and local) smoke groups, and (III) analysis of smoke particles over four geographical regions (SE Europe, NE Europe, Central Europe and SW Europe). Five events were found for case (I), while 24 events were determined for case (II). A statistical analysis over the four geographical regions considered revealed that smoke originated from different regions. The smoke detected in the Central Europe region (Cabauw, Leipzig, and Hohenpeißenberg) was mostly brought over from North America (87 % of the fires), by long range transport. The smoke in the South West region (Barcelona, Evora, and Granada) came mostly from the Iberian Peninsula and North Africa, the long-range transport from North America accounting for only 9 % here. The smoke in the North Europe region (Belsk, Minsk, and Warsaw) originated mostly in East Europe (Ukraine and Russia), and had a 31 % contribution from smoke by long-range transport from North America. For the South East region (Athens, Bucharest, Potenza, Sofia, Thessaloniki) the origin of the smoke was mostly located in SE Europe (only 3 % from North America). Specific features for the lidar-derived intensive parameters based on smoke continental origin were determined for each region. Based on the whole dataset, the following signatures were observed: (i) the colour ratio of the lidar ratio and the backscatter Ångström exponent increase with travel time, while the extinction Ångström exponent and the colour ratio of the particle depolarization ratio decrease; (ii) an increase of the colour ratio of the particle depolarization ratio corresponds to both a decrease of the colour ratio of the lidar ratios and an increase of the extinction Ångström exponent; (iii) the measured smoke originating from all continental regions is characterized in average as aged smoke, except for a few cases; (iv) in general, the local smoke shows a smaller lidar ratio while the long range transported smoke shows a higher lidar ratio; and (v) the depolarization is smaller for long range transported smoke. A complete characterization of the smoke particles type (either fresh or aged) is presented for each of the four geographical regions versus different continental source regions. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
10. SACS-2/SMASH – Validation Report on the Eyjafjallajökull and Grimsvötn eruptions
- Author
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Koukouli, MariLiza, Balis, Dimitris, Dimopoulos, Spiros, and Siomos, Nikos
- Subjects
Lidar ,GOME2 ,Eyjafjallajökull ,IASI ,Grimsvötn ,CALIPSO ,SO2 ,Volcanic ash - Abstract
The main objective of the SACS-2/SMASH project is to create an optimal End-to-End System for Volcanic Ash Plume Monitoring and Prediction. This system is based on improved and dedicated satellite-derived ash plume and sulphur dioxide level assessments, as well as an extensive validation using auxiliary satellite, aircraft and ground-based measurements. The focus of the LAP/AUTH satellite data validation activities is to validate SO2 and ash characteristics products provided by different satellite instruments during the following eruptions: 15 to 26 April 2010, Eyjafjallajökull, Iceland. 4 to 20 May 2010, Eyjafjallajökull, Iceland. 21 to 28 May 2011, Grimsvötn, Iceland. The validation was performed on two levels, on the total SO2 column assessment, discussed in length in Section 2, and on the ash plume characteristics, i.e. the aerosol optical depth and, where applicable, the ash plume height, presented in Sections 3, 4 and 5. A short section on satellite-to-satellite inter-comparison is given both in sub-section 2.7 for the SO2 products as well as in Section 6 for all different ash products.
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- 2014
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11. Satellite Monitoring of Ash and Sulphur Dioxide for the mitigation of Aviation Hazards: Part I. Validation of satellite-derived Volcanic Ash Levels
- Author
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Koukouli, Mariliza, Balis, Dimitris, Simopoulos, Spiros, Siomos, Nikos, Clarisse, Lieven, Carboni, Elisa, Wang, Ping, Siddans, Richard, Marenco, Franco, Spinetti, Claudia, Theys, Nicolas, Tampellini, Lucia, and Zehner, Claus
- Published
- 2014
- Full Text
- View/download PDF
12. Satellite Monitoring of Ash and Sulphur Dioxide for the mitigation of Aviation Hazards: Part I. Validation of satellite-derived Volcanic Ash Levels.
- Author
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EGU General Assembly (27 April - 02 May 2014: Vienna, Austria), Koukouli, Mariliza, Balis, Dimitris, Dimopoulos, Spiros, Siomos, Nikos, Clarisse, Lieven, Carboni, Elisa, Wang, Ping, Siddans, Richard, Marenco, Franco, Mona, L., Pappalardo, Gelsomina, Spinetti, Claudia, Theys, Nicolas, Tampellini, Lucia, Zehner, Claus, EGU General Assembly (27 April - 02 May 2014: Vienna, Austria), Koukouli, Mariliza, Balis, Dimitris, Dimopoulos, Spiros, Siomos, Nikos, Clarisse, Lieven, Carboni, Elisa, Wang, Ping, Siddans, Richard, Marenco, Franco, Mona, L., Pappalardo, Gelsomina, Spinetti, Claudia, Theys, Nicolas, Tampellini, Lucia, and Zehner, Claus
- Abstract
info:eu-repo/semantics/nonPublished
- Published
- 2014
13. Advancing the remote sensing of desert dust.
- Author
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Comerón, Adolfo, Kassianov, Evgueni I., Schäfer, Klaus, Picard, Richard H., Weber, Konradin, Singh, Upendra N., Amiridis, Vassilis, Tsekeri, Alexandra, Marinou, Eleni, Proestakis, Emmanouel, Gkikas, Antonis, Gialitaki, Anna, Daskalopoulou, Vassiliki, Paschou, Peristera, Siomos, Nikos, Binietoglou, Ioannis, Gasteiger, Josef, Freudenthaler, Volker, Mamouri, Rodanthi-Elisaveth, and Ansmann, Albert
- Published
- 2019
- Full Text
- View/download PDF
14. Mineral dust size distributions in the eastern Mediterranean from balloon-borne optical particle counter and validation with aircraft measurements and remote-sensing retrievals.
- Author
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Kezoudi, Maria, Tesche, Matthias, Smith, Helen, Ulanowski, Joseph, Tsekeri, Alexandra, Baars, Holger, Siomos, Nikos, Estellés, Victor, Miladi, Linda, Müller, Detlef, Amiridis, Vassilis, and Weinzierl, Bernadett
- Published
- 2019
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