284 results on '"Nicolae, Doina"'
Search Results
2. Combined sun-photometer/lidar inversion: lessons learned during the EARLINET/ACTRIS COVID-19 Campaign
- Author
-
Tsekeri, Alexandra, Gialitaki, Anna, Paolantonio, Marco, Dionisi, Davide, Liberti, Gian Luigi, Fernandes, Alnilam, Szkop, Artur, Pietruczuk, Aleksander, Pérez-Ramírez, Daniel, Granados Muñoz, Maria J., Guerrero-Rascado, Juan Luis, Alados-Arboledas, Lucas, Bermejo-Pantaleón, Diego, Bravo-Aranda, Juan Antonio, Kampouri, Anna, Marinou, Eleni, Amiridis, Vassilis, Sicard, Michael, Comerón, Adolfo, Muñoz-Porcar, Constantino, Rodríguez-Gómez, Alejandro, Romano, Salvatore, Perrone, Maria Rita, Shang, Xiaoxia, Komppula, Mika, Mamouri, Rodanthi-Elisavet, Nisantzi, Argyro, Hadjimitsis, Diofantos, Navas-Guzmán, Francisco, Haefele, Alexander, Szczepanik, Dominika, Tomczak, Artur, Stachlewska, Iwona, Belegante, Livio, Nicolae, Doina, Voudouri, Kalliopi Artemis, Balis, Dimitris, Floutsi, Athina A., Baars, Holger, Miladi, Linda, Pascal, Nicolas, Dubovik, Oleg, and Lopatin, Anton
- Abstract
The European Aerosol Research Lidar Network (EARLINET), part of the Aerosols, Clouds and Trace gases Research Infrastructure (ACTRIS), organized an intensive observational campaign in May 2020, with the objective of monitoring the atmospheric state over Europe during the COVID-19 lockdown and relaxation period. Besides the standard operational processing of the lidar data in EARLINET, for seven EARLINET sites having co-located sun-photometric observations in AERONET, a network exercise was held in order to derive profiles of the concentration and effective-column size distributions of the aerosols in the atmosphere, by applying the GRASP/GARRLiC inversion algorithm. The objective of this network exercise was to explore the possibility to identify the anthropogenic component and to monitor its spatial and temporal characteristics in the COVID-19 lockdown and relaxation period. While the number of cases are far from being statistically significant so as to provide a conclusive description of the atmospheric aerosols over Europe during this period, this network exercise was fundamental to derive a common methodology for applying GRASP/GARRLiC on a network of instruments with different characteristics. The limits of the approach are discussed, in particular the missing information close to the ground in the lidar measurements due to the instrument geometry, and the sensitivity of the GRASP/GARRLiC retrieval to the settings used, especially for cases with low AOD as the ones we show here. We found that this sensitivity is well-characterized in the GRASP/GARRLiC products, since it is included in their retrieval uncertainties.
- Published
- 2023
3. Using Raman-lidar-based regularized microphysical retrievals and Aerosol Mass Spectrometer measurements for the characterization of biomass burning aerosols
- Author
-
Samaras, Stefanos, Nicolae, Doina, Böckmann, Christine, Vasilescu, Jeni, Binietoglou, Ioannis, Labzovskii, Lev, Toanca, Florica, and Papayannis, Alexandros
- Published
- 2015
- Full Text
- View/download PDF
4. ACTRIS and its Aerosol Remote Sensing Component
- Author
-
Wandinger Ulla, Nicolae Doina, Pappalardo Gelsomina, Mona Lucia, and Comerón Adolfo
- Subjects
Physics ,QC1-999 - Abstract
The Aerosol, Clouds and Trace Gases Research Infrastructure ACTRIS is currently being developed with support from more than 20 countries and more than 100 research-performing organizations in Europe. The pan-European distributed research infrastructure shall provide data and services related to short-lived atmospheric constituents to facilitate high-quality Earth system research in the long term (over at least 20 years). While some of the activities are already in place, ACTRIS functionality will be further ramped up until full operation in 2025. The observation of aerosol, clouds and reactive trace gases with in-situ and remote-sensing techniques in ACTRIS is supported by six Topical Centres, which are responsible for common standards and quality assurance. Free and open virtual access to ACTRIS data is provided by the Data Centre. International users will also have physical access to ACTRIS observatories, atmospheric simulation chambers and mobile platforms as well as remote or physical access to calibration services, digital services and training. Access provision is organized through a single-entry point by the Head Office. In this contribution, the general principles and structure of ACTRIS are introduced, and the observational component related to aerosol remote sensing, which builds on the heritage of the European Aerosol Research Lidar Network (EARLINET) and the European part of the Aerosol Robotic Network (AERONET-Europe), is explained in more detail.
- Published
- 2020
- Full Text
- View/download PDF
5. Biomass Burning Measurements in Earlinet
- Author
-
Adam Mariana, Nicolae Doina, Belegante Livio, Stachlewska Iwona S., Szczepanik Dominika, Mylonaki Maria, Papanikolaou Christiana Anna, Siomos Nikolaos, Voudouri Kalliopi A., Apituley Arnoud, Alados-Arboledas Luca, Bravo-Aranda Juan Antonio, Pietruczuk Aleksander, Chaikovski Anatoli, Sicard Michaël, Muñoz-Porcar Constantino, Mattis Ina, Papagiannopoulos Nikolaos, Mona Lucia, Baars Holger, Wandinger Ulla, Bortoli Daniele, Grigorov Ivan, Peshev Zahary, and Antonescu Bogdan
- Subjects
Physics ,QC1-999 - Abstract
The biomass burning events are analyzed using the EARLINET-ACTRIS atmospheric profiling of aerosols using lidars. The period of 2008-2017 was chosen to analyze all the events assigned in the EARLINET database under Forest Fire category. A number of fourteen stations were considered. The data provided, ranged from complete data sets (backscatter, extinction and particle linear depolarization ratio) to single profiles (backscatter coefficient). A thorough quality control was performed. Smoke layers geometry was evaluated and the mean properties within each layer were computed. The Hysplit backward-trajectory technique and the FIRMS fire database were used to double check the source of each layer. Discussions were made under the following scenarios: fire events seen by two stations, long range transport from North America, and geographical clusters.
- Published
- 2020
- Full Text
- View/download PDF
6. Synergetic Observations by Ground-Based and Space Lidar Systems and Aeronet Sun-Radiometers: A Step to Advanced Regional Monitoring of Large Scale Aerosol Changes
- Author
-
Chaikovsky Anatoli, Bril Andrey, Dubovik Oleg, Fedarenka Anton, Goloub Philippe, Hu Qiaoyun, Lopatin Anton, Lapyonok Tatyana, Miatselskaya Natallia, Torres Benjamin, Fuertes David, Peshcharankou Vladislau, Podvin Thierry, Popovici Ioana, Liu Dong, Li Zhengqiang, Soupiona Ourania, Mylonaki Maria, Mona Lucia, Giunta Aldo, Papagiannopoulos Nikolaos, Perrone Maria Rita, Romano Salvatore, Balis Dimitris, Siomos Nikolaos, Voudouri Kalliopi-Artemis, Belegante Livio, Nicolae Doina, Ene Dragos, Ajtai Nicolae, Stefanie Horatiu, Amiridis Vassilis, Tsekeri Alexandra, Bortoli Daniele, Costa Maria Joao, Mattis Ina, Rocadenbosch Francesc, Rodríguez-Gomez Alejandro, Sicard Michael, Fernandez Alfonso J., Molero Francisco, Althausen Dietrich, Baars Holger, Rascado Juan Luis Guerrero, Ortiz-Amezcua Pablo, Oltra José Antonio Benavent, Bedoya-Velásquez Andrés Esteban, Román Roberto, Alados-Arboledas Lucas, Balin Yurii, Kokhanenko Grigorii, Penner Ivan, Chen Boris, Sverdlik Leonid, Milinevsky Genadi, Sugimoto Nobuo, Shimizu Atsushi, Nishizawa Tomoaki, Kudo Rei, Sano Itaru, Yasunari Teppei J., Irie Hitoshi, Takemura Toshihiko, Kim Sang-Woo, Anh Nguyen Xuan, Thanh Pham Xuan, Pietruczuk Aleksander, Stachlewska Iwona S., Sannino Alessia, Wang Xuan, and Boselli Antonela
- Subjects
Physics ,QC1-999 - Abstract
The paper presents the preliminary results of the lidar&radiometer measurement campaign (LRMC-2017), estimation of statistical relations between aerosol mode concentrations retrieved from CALIOP and ground-based lidar stations and case study of fire smoke events in the Eurasian regions using combined ground-based and space lidar and radiometer observations.
- Published
- 2020
- Full Text
- View/download PDF
7. Aerosol Field Influence on the Retrieval of the Ozone Vertical Column Densities from Pandora 2S Measurements
- Author
-
Dandocsi Alexandru, Nemuc Anca, Nicolae Doina, Belegante Livio, Cede Alexander, and Tiefengraber Martin
- Subjects
Physics ,QC1-999 - Abstract
Total ozone and other trace gases are measured and reported regularly due to the increased interest started with the ozone hole discovery but the new satellites dedicated to worldwide observations of these species need both short-and long-term well calibrated ground based observation for validation procedures. The ESA/NASA Pandora network established a sophisticated, automatic calibration procedure that utilizes a variety of narrow-line and broadband emission lamps with temperature control for their UV-Vis-NIR spectroradiometers. In this study, we describe additional calibration efforts for ozone retrievals. In this paper we explore the local aerosol field influence on the retrieval of the ozone spectra from PANDORA 2S measurements using collocated lidar and sunphotometer measurements and proposed a methodology to be implemented in the calibration procedure of the instruments.
- Published
- 2020
- Full Text
- View/download PDF
8. New Algorithm for the Retrieval of Aerosol's Optical Parameters by LIDAR Data Inversion
- Author
-
Talianu, Camelia, Nicolae, Doina, Cristescu, C. P., Ciuciu, Jeni, Nemuc, Anca, Carstea, Emil, Belegante, Livio, Ciobanu, Mircea, Bock, Hans-Georg, editor, de Hoog, Frank, editor, Friedman, Avner, editor, Gupta, Arvind, editor, Neunzert, Helmut, editor, Pulleyblank, William R., editor, Rusten, Torgeir, editor, Santosa, Fadil, editor, Tornberg, Anna-Karin, editor, Ciuprina, Gabriela, editor, and Ioan, Daniel, editor
- Published
- 2007
- Full Text
- View/download PDF
9. A novel method of identifying and analysing oil smoke plumes based on MODIS and CALIPSO satellite data
- Author
-
Mereuţă, Alexandru, primary, Ajtai, Nicolae, additional, Radovici, Andrei T., additional, Papagiannopoulos, Nikolaos, additional, Deaconu, Lucia T., additional, Botezan, Camelia S., additional, Ştefănie, Horaţiu I., additional, Nicolae, Doina, additional, and Ozunu, Alexandru, additional
- Published
- 2022
- Full Text
- View/download PDF
10. Regularized inversion of microphysical atmospheric particle parameters: Theory and application
- Author
-
Osterloh, Lukas, Böckmann, Christine, Nicolae, Doina, and Nemuc, Anca
- Published
- 2013
- Full Text
- View/download PDF
11. SUPPORT CENTER FOR MANAGEMENT AND PROMOTION IN SERVICE OF EUROPEAN RESEARCH PROJECTS.
- Author
-
Toanca, Florica, Nicolae, Doina, Vasilescu, Georgeta Jeni, Andrei, Simona Cornelia, Radu, Cristian, and Tilea, Alin Alexandru
- Subjects
- *
TRACE gases , *REMOTE sensing , *INTERNATIONAL competition , *ANALYTICAL chemistry , *RESEARCH & development projects - Abstract
The Remote Sensing department from National Institute of R&D for Optoelectronics INOE, Romania, operates a complex research infrastructure and has multidisciplinary expertise spanning from laboratory/in-situ chemical analysis to Earth Observation (EO) techniques and applications. Infrastructure and personnel are mostly supported from projects financed by European Commission through FP7/Horizon 2020 (ended programs) and Horizon Europe (current programme) and other international calls (e.g., European Space Agency). In order to facilitate support of R&D projects submission/execution/reporting to Horizon Europe framework program competitions and other international calls, INOE is building a dedicated center until mid-2023, through PREPARE project - "Support Center for European Project Management and European Promotion", funded under the Competitiveness Operational Program (2014-2020), the action 1.1.3 "Creating synergies with the RDI actions of the European Union's HORIZON 2020 framework program and other international RDI programs". This work presents the results of our journey of drawing the main components of the management and promotion center that will mainly support large projects related to ACTRIS - Aerosol, Clouds and Trace Gases Research Infrastructure (ACTRIS). The center is intended to guide and support scientists' approach from idea to grant negotiation stages and also to project implementation and reporting. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
12. The analysis of a complex fire event using multispaceborne observations
- Author
-
Andrei Simona, Carstea Emil, Marmureanu Luminita, Ene Dragos, Binietoglou Ioannis, Nicolae Doina, Konsta Dimitra, Amiridis Vassilis, and Proestakis Emmanouil
- Subjects
Physics ,QC1-999 - Abstract
This study documents a complex fire event that occurred on October 2016, in Middle East belligerent area. Two fire outbreaks were detected by different spacecraft monitoring instruments on board of TERRA, CALIPSO and AURA Earth Observation missions. Link with local weather conditions was examined using ERA Interim Reanalysis and CAMS datasets. The detection of the event by multiple sensors enabled a detailed characterization of fires and the comparison with different observational data.
- Published
- 2018
- Full Text
- View/download PDF
13. Analysis of different cloud signatures using multiwavelength raman lidar retrievals
- Author
-
Andrei Simona, Ţoancă Flori, Nemuc Anca, Dandocsi Alex, Belegante Livio, and Nicolae Doina
- Subjects
Physics ,QC1-999 - Abstract
The present study is focused on microphysics analysis of different cloud types observed by a multi-wavelength Raman lidar. Particle’s content from a wide variety of cloud types, produced in various atmospheric environments, were investigated using data provided by lidar and validated using ECMWF’s ERA Interim reanalysis. The results emphasized the capability of lidar instruments to detect multiple cloud layers, and to discriminate between ice particles and water droplets found within the studied clouds.
- Published
- 2018
- Full Text
- View/download PDF
14. An automatic aerosol classification for earlinet: application and results
- Author
-
Papagiannopoulos Nikolaos, Mona Lucia, Amiridis Vassilis, Binietoglou Ioannis, D’Amico Giuseppe, Guma-Claramunt P., Schwarz Anja, Alados-Arboledas Lucas, Amodeo Aldo, Apituley Arnoud, Baars Holger, Bortoli Daniele, Comeron Adolfo, Guerrero-Rascado Juan Luis, Kokkalis Panos, Nicolae Doina, Papayannis Alex, Pappalardo Gelsomina, Wandinger Ulla, and Wiegner Matthias
- Subjects
Physics ,QC1-999 - Abstract
Aerosol typing is essential for understanding the impact of the different aerosol sources on climate, weather system and air quality. An aerosol classification method for EARLINET (European Aerosol Research Lidar Network) measurements is introduced which makes use the Mahalanobis distance classifier. The performance of the automatic classification is tested against manually classified EARLINET data. Results of the application of the method to an extensive aerosol dataset will be presented.
- Published
- 2018
- Full Text
- View/download PDF
15. Strengths and limitations of the NATALI code for aerosol typing from multiwavelength Raman lidar observations
- Author
-
Nicolae Doina, Talianu Camelia, Vasilescu Jeni, Nicolae Victor, and Stachlewska Iwona S.
- Subjects
Physics ,QC1-999 - Abstract
A Python code was developed to automatically retrieve the aerosol type (and its predominant component in the mixture) from EARLINET’s 3 backscatter and 2 extinction data. The typing relies on Artificial Neural Networks which are trained to identify the most probable aerosol type from a set of mean-layer intensive optical parameters. This paper presents the use and limitations of the code with respect to the quality of the inputed lidar profiles, as well as with the assumptions made in the aerosol model.
- Published
- 2018
- Full Text
- View/download PDF
16. Earlinet validation of CATS L2 product
- Author
-
Proestakis Emmanouil, Amiridis Vassilis, Kottas Michael, Marinou Eleni, Binietoglou Ioannis, Ansmann Albert, Wandinger Ulla, Yorks John, Nowottnick Edward, Makhmudov Abduvosit, Papayannis Alexandros, Pietruczuk Aleksander, Gialitaki Anna, Apituley Arnoud, Muñoz-Porcar Constantino, Bortoli Daniele, Dionisi Davide, Althausen Dietrich, Mamali Dimitra, Balis Dimitris, Nicolae Doina, Tetoni Eleni, Luigi Liberti Gian, Baars Holger, Stachlewska Iwona S., Voudouri Kalliopi-Artemis, Mona Lucia, Mylonaki Maria, Rita Perrone Maria, João Costa Maria, Sicard Michael, Papagiannopoulos Nikolaos, Siomos Nikolaos, Burlizzi Pasquale, Engelmann Ronny, Abdullaev Sabur F., Hofer Julian, and Pappalardo Gelsomina
- Subjects
Physics ,QC1-999 - Abstract
The Cloud-Aerosol Transport System (CATS) onboard the International Space Station (ISS), is a lidar system providing vertically resolved aerosol and cloud profiles since February 2015. In this study, the CATS aerosol product is validated against the aerosol profiles provided by the European Aerosol Research Lidar Network (EARLINET). This validation activity is based on collocated CATS-EARLINET measurements and the comparison of the particle backscatter coefficient at 1064nm.
- Published
- 2018
- Full Text
- View/download PDF
17. A Decade of Poland-AOD Aerosol Research Network Observations
- Author
-
Markowicz, Krzysztof M., primary, Stachlewska, Iwona S., additional, Zawadzka-Manko, Olga, additional, Wang, Dongxiang, additional, Kumala, Wojciech, additional, Chilinski, Michal T., additional, Makuch, Przemyslaw, additional, Markuszewski, Piotr, additional, Rozwadowska, Anna K., additional, Petelski, Tomasz, additional, Zielinski, Tymon, additional, Posyniak, Michal, additional, Kaminski, Jacek W., additional, Szkop, Artur, additional, Pietruczuk, Aleksander, additional, Chojnicki, Bogdan H., additional, Harenda, Kamila M., additional, Poczta, Patryk, additional, Uscka-Kowalkowska, Joanna, additional, Struzewska, Joanna, additional, Werner, Malgorzata, additional, Kryza, Maciej, additional, Drzeniecka-Osiadacz, Anetta, additional, Sawinski, Tymoteusz, additional, Remut, Arkadiusz, additional, Mietus, Miroslaw, additional, Wiejak, Krzysztof, additional, Markowicz, Jacek, additional, Belegante, Livio, additional, and Nicolae, Doina, additional
- Published
- 2021
- Full Text
- View/download PDF
18. Supplementary material to "Biomass burning events measured by lidars in EARLINET – Part 2: Optical properties investigation"
- Author
-
Adam, Mariana, primary, Stachlewska, Iwona S., additional, Mona, Lucia, additional, Papagiannopoulos, Nikolaos, additional, Bravo-Aranda, Juan Antonio, additional, Sicard, Michaël, additional, Nicolae, Doina N., additional, Belegante, Livio, additional, Janicka, Lucja, additional, Szczepanik, Dominika, additional, Mylonaki, Maria, additional, Papanikolaou, Christina-Anna, additional, Siomos, Nikolaos, additional, Voudouri, Kalliopi Artemis, additional, Alados-Arboledas, Luca, additional, Apituley, Arnoud, additional, Mattis, Ina, additional, Chaikovsky, Anatoli, additional, Muñoz-Porcar, Constantino, additional, Pietruczuk, Aleksander, additional, Bortoli, Daniele, additional, Baars, Holger, additional, Grigorov, Ivan, additional, and Peshev, Zahary, additional
- Published
- 2021
- Full Text
- View/download PDF
19. Biomass burning events measured by lidars in EARLINET – Part 2: Optical properties investigation
- Author
-
Adam, Mariana, primary, Stachlewska, Iwona S., additional, Mona, Lucia, additional, Papagiannopoulos, Nikolaos, additional, Bravo-Aranda, Juan Antonio, additional, Sicard, Michaël, additional, Nicolae, Doina N., additional, Belegante, Livio, additional, Janicka, Lucja, additional, Szczepanik, Dominika, additional, Mylonaki, Maria, additional, Papanikolaou, Christina-Anna, additional, Siomos, Nikolaos, additional, Voudouri, Kalliopi Artemis, additional, Alados-Arboledas, Luca, additional, Apituley, Arnoud, additional, Mattis, Ina, additional, Chaikovsky, Anatoli, additional, Muñoz-Porcar, Constantino, additional, Pietruczuk, Aleksander, additional, Bortoli, Daniele, additional, Baars, Holger, additional, Grigorov, Ivan, additional, and Peshev, Zahary, additional
- Published
- 2021
- Full Text
- View/download PDF
20. A novel method of identifying and analysing oil smoke plumes based on synergic satellite data
- Author
-
Mereuță, Alexandru, primary, Ajtai, Nicolae, additional, Radovici, Andrei Titus, additional, Papagiannopoulos, Nikolaos, additional, Deaconu, Lucia Timea, additional, Botezan, Camelia, additional, Ștefănie, Horațiu Ioan, additional, Nicolae, Doina, additional, and Ozunu, Alexandru, additional
- Published
- 2021
- Full Text
- View/download PDF
21. Retrieval of the boundary layer height from active and passive remote sensors. Comparison with a NWP model
- Author
-
Belegante, Livio, Nicolae, Doina, Nemuc, Anca, Talianu, Camelia, and Derognat, Claude
- Published
- 2014
- Full Text
- View/download PDF
22. Optical properties of long-range transported volcanic ash over Romania and Poland during Eyjafjallajökull eruption in 2010
- Author
-
Nemuc, Anca, Stachlewska, Iwona S., Vasilescu, Jeni, Górska, Anna, Nicolae, Doina, and Talianu, Camelia
- Published
- 2014
- Full Text
- View/download PDF
23. SAMIRA-SAtellite Based Monitoring Initiative for Regional Air Quality
- Author
-
Stebel, Kerstin, primary, Stachlewska, Iwona S., additional, Nemuc, Anca, additional, Horálek, Jan, additional, Schneider, Philipp, additional, Ajtai, Nicolae, additional, Diamandi, Andrei, additional, Benešová, Nina, additional, Boldeanu, Mihai, additional, Botezan, Camelia, additional, Marková, Jana, additional, Dumitrache, Rodica, additional, Iriza-Burcă, Amalia, additional, Juras, Roman, additional, Nicolae, Doina, additional, Nicolae, Victor, additional, Novotný, Petr, additional, Ștefănie, Horațiu, additional, Vaněk, Lumír, additional, Vlček, Ondrej, additional, Zawadzka-Manko, Olga, additional, and Zehner, Claus, additional
- Published
- 2021
- Full Text
- View/download PDF
24. Pilot provision of EARLINET/ACTRIS lidar profiles to CAMS
- Author
-
Mona, Lucia, primary, D'Amico, Giuseppe, additional, Gagliardi, Simone, additional, Amato, Francesco, additional, Amodeo, Aldo, additional, Ciamprone, Sergio, additional, De Rosa, Benedetto, additional, Ripepi, Ermann, additional, Summa, Donato, additional, Alados-Arboledas, Lucas, additional, Amiridis, Vassilis, additional, Baars, Holger, additional, Kompula, Mika, additional, Mattis, Ina, additional, Nicolae, Doina, additional, Pietras, Christoper, additional, Stachlewska, Iwona S., additional, and Peuch, Vincent Henri, additional
- Published
- 2021
- Full Text
- View/download PDF
25. Aerosol type classification analysis using EARLINET multiwavelength and depolarization lidar observations
- Author
-
Mylonaki, Maria, primary, Giannakaki, Elina, additional, Papayannis, Alexandros, additional, Papanikolaou, Christina-Anna, additional, Komppula, Mika, additional, Nicolae, Doina, additional, Papagiannopoulos, Nikolaos, additional, Amodeo, Aldo, additional, Baars, Holger, additional, and Soupiona, Ourania, additional
- Published
- 2021
- Full Text
- View/download PDF
26. Independent Retrieval of Aerosol Type From Lidar
- Author
-
Nicolae Doina, Vasilescu Jeni, Talianu Camelia, and Dandocsi Alexandru
- Subjects
Physics ,QC1-999 - Abstract
This paper presents an algorithm for aerosol typing from multiwavelength lidar data, based on Artificial Neural Networks. The aerosol model used to simulate optical properties for the training of the network is described. The algorithm is tested on real observations from ESA-CALIPSO database.
- Published
- 2016
- Full Text
- View/download PDF
27. Lidar Calibration Centre
- Author
-
Pappalardo Gelsomina, Freudenthaler Volker, Nicolae Doina, Mona Lucia, Belegante Livio, and D’Amico Giuseppe
- Subjects
Physics ,QC1-999 - Abstract
This paper presents the newly established Lidar Calibration Centre, a distributed infrastructure in Europe, whose goal is to offer services for complete characterization and calibration of lidars and ceilometers. Mobile reference lidars, laboratories for testing and characterization of optics and electronics, facilities for inspection and debugging of instruments, as well as for training in good practices are open to users from the scientific community, operational services and private sector. The Lidar Calibration Centre offers support for trans-national access through the EC HORIZON2020 project ACTRIS-2.
- Published
- 2016
- Full Text
- View/download PDF
28. Combined sphere-spheroid particle model for the retrieval of the microphysical aerosol parameters via regularized inversion of lidar data
- Author
-
Samaras Stefanos, Böckmann Christine, and Nicolae Doina
- Subjects
Physics ,QC1-999 - Abstract
In this work we propose a two-step advancement of the Mie spherical-particle model accounting for particle non-sphericity. First, a naturally two-dimensional (2D) generalized model (GM) is made, which further triggers analogous 2D re-definitions of microphysical parameters. We consider a spheroidal-particle approach where the size distribution is additionally dependent on aspect ratio. Second, we incorporate the notion of a sphere-spheroid particle mixture (PM) weighted by a non-sphericity percentage. The efficiency of these two models is investigated running synthetic data retrievals with two different regularization methods to account for the inherent instability of the inversion procedure. Our preliminary studies show that a retrieval with the PM model improves the fitting errors and the microphysical parameter retrieval and it has at least the same efficiency as the GM. While the general trend of the initial size distributions is captured in our numerical experiments, the reconstructions are subject to artifacts. Finally, our approach is applied to a measurement case yielding acceptable results.
- Published
- 2016
- Full Text
- View/download PDF
29. Biomass burning events measured by lidars in EARLINET – Part 1: Data analysis methodology
- Author
-
Adam, Mariana, primary, Nicolae, Doina, additional, Stachlewska, Iwona S., additional, Papayannis, Alexandros, additional, and Balis, Dimitris, additional
- Published
- 2020
- Full Text
- View/download PDF
30. Aerosol type classification analysis using EARLINET multiwavelength and depolarization lidar observations
- Author
-
Mylonaki, Maria, primary, Giannakaki, Elina, additional, Papayannis, Alexandros, additional, Papanikolaou, Christina-Anna, additional, Komppula, Mika, additional, Nicolae, Doina, additional, Papagiannopoulos, Nikolaos, additional, Amodeo, Aldo, additional, Baars, Holger, additional, and Soupiona, Ourania, additional
- Published
- 2020
- Full Text
- View/download PDF
31. Satellite validation strategy assessments based on the AROMAT campaigns
- Author
-
Merlaud, Alexis, primary, Belegante, Livio, additional, Constantin, Daniel-Eduard, additional, Den Hoed, Mirjam, additional, Meier, Andreas Carlos, additional, Allaart, Marc, additional, Ardelean, Magdalena, additional, Arseni, Maxim, additional, Bösch, Tim, additional, Brenot, Hugues, additional, Calcan, Andreea, additional, Dekemper, Emmanuel, additional, Donner, Sebastian, additional, Dörner, Steffen, additional, Balanica Dragomir, Mariana Carmelia, additional, Georgescu, Lucian, additional, Nemuc, Anca, additional, Nicolae, Doina, additional, Pinardi, Gaia, additional, Richter, Andreas, additional, Rosu, Adrian, additional, Ruhtz, Thomas, additional, Schönhardt, Anja, additional, Schuettemeyer, Dirk, additional, Shaiganfar, Reza, additional, Stebel, Kerstin, additional, Tack, Frederik, additional, Nicolae Vâjâiac, Sorin, additional, Vasilescu, Jeni, additional, Vanhamel, Jurgen, additional, Wagner, Thomas, additional, and Van Roozendael, Michel, additional
- Published
- 2020
- Full Text
- View/download PDF
32. Pilot study of ultra-high energy Cosmic rays through their Space – Atmospheric interactions – COSAT
- Author
-
Isar Paula Gina and Nicolae Doina
- Subjects
Physics ,QC1-999 - Abstract
One hundred years after the discovery of cosmic rays, the study of charged ultra-high energy cosmic rays remains a vital activity in fundamental physics. While primary cosmic rays could not be measured directly until it was possible to get the detectors high in the atmosphere using balloons or spacecraft, nowadays very energetic cosmic rays are detected indirectly by ground-based experiments measuring their Extensive Air Showers (EAS) induced Cherenkov and fluorescent light, or radio waves. Moreover, all cosmic ray measurements (performed either from space or ground) rely on accurate understandings of atmospheric phenomena. The concept of the COSAT project is the inter-link between Astroparticle Physics, Remote Sensing and Atmospheric Environment, willing to investigate the energetic cosmic rays physical processes using the atmosphere as a detector in order to identify potential scientific niches in the field of space sciences. A short introduction on the current status and perspectives of the national partnership COSAT project will be given.
- Published
- 2015
- Full Text
- View/download PDF
33. Biomass burning events measured by lidars in EARLINET. Part II. Results and discussions
- Author
-
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
34. Supplementary material to "Biomass burning events measured by lidars in EARLINET. Part II. Results and discussions"
- Author
-
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
35. Application of airborne and spaceborne hyperspectral imaging techniques for atmospheric research: past, present, and future
- Author
-
Calin, Mihaela Antonina, primary, Calin, Adrian Cantemir, additional, and Nicolae, Doina Nicoleta, additional
- Published
- 2020
- Full Text
- View/download PDF
36. Supplementary material to "Biomass burning events measured by lidars in EARLINET. Part I. Data analysis methodology"
- Author
-
Adam, Mariana, primary, Nicolae, Doina, additional, Stachlewska, Iwona S., additional, Papayannis, Alexandros, additional, and Balis, Dimitris, additional
- Published
- 2020
- Full Text
- View/download PDF
37. Biomass burning events measured by lidars in EARLINET. Part I. Data analysis methodology
- Author
-
Adam, Mariana, primary, Nicolae, Doina, additional, Stachlewska, Iwona S., additional, Papayannis, Alexandros, additional, and Balis, Dimitris, additional
- Published
- 2020
- Full Text
- View/download PDF
38. The Sentinel-5 Precursor VAlidatioN and calibraTion Experiment (SVANTE)
- Author
-
Van Roozendael, Michel, primary, Tack, Frederik, additional, Merlaud, Alexis, additional, Schuettemeyer, Dirk, additional, Hase, Frank, additional, Richter, Andreas, additional, Meier, Andreas, additional, Sha, Mahesh Kumar, additional, De Mazière, Martine, additional, Apituley, Arnoud, additional, Nicolae, Doina, additional, Calcan, Andreaa, additional, Ruhtz, Thomas, additional, Crévoisier, Cyril, additional, Roiger, Anke, additional, Dehn, Angelika, additional, and Zehner, Claus, additional
- Published
- 2020
- Full Text
- View/download PDF
39. ACTRIS efforts for Sentinel 5 Precursor validation
- Author
-
Mona, Lucia, primary, Papagiannopoulus, Nikolaos, additional, Pappalardo, Gelsomina, additional, Wandinger, Ulla, additional, D'Amico, Giuseppe, additional, Amiridis, Vassilis, additional, Arboledas, Lucas-Alados, additional, Nicolae, Doina, additional, Apituley, Arnoud, additional, O'Connor, Ewan, additional, and Pressler, Jana, additional
- Published
- 2020
- Full Text
- View/download PDF
40. The Airborne ROmanian Measurements of Aerosols and Trace gases (AROMAT) campaigns
- Author
-
Merlaud, Alexis, primary, Belegante, Livio, additional, Constantin, Daniel-Eduard, additional, Den Hoed, Mirjam, additional, Meier, Andreas Carlos, additional, Allaart, Marc, additional, Ardelean, Magdalena, additional, Arseni, Maxim, additional, Bösch, Tim, additional, Brenot, Hugues, additional, Calcan, Andreea, additional, Dekemper, Emmanuel, additional, Donner, Sebastian, additional, Dörner, Steffen, additional, Dragomir, Carmelia, additional, Georgescu, Lucian, additional, Nemuc, Anca, additional, Nicolae, Doina, additional, Pinardi, Gaia, additional, Richter, Andreas, additional, Rosu, Adrian, additional, Ruhtz, Thomas, additional, Schönhardt, Anja, additional, Schuettemeyer, Dirk, additional, Shaiganfar, Reza, additional, Stebel, Kerstin, additional, Tack, Frederik, additional, Nicolae Vâjâiac, Sorin, additional, Vasilescu, Jeni, additional, Vanhamel, Jurgen, additional, Wagner, Thomas, additional, and Van Roozendael, Michel, additional
- Published
- 2020
- Full Text
- View/download PDF
41. Supplementary material to "The Airborne ROmanian Measurements of Aerosols and Trace gases (AROMAT) campaigns"
- Author
-
Merlaud, Alexis, primary, Belegante, Livio, additional, Constantin, Daniel-Eduard, additional, Den Hoed, Mirjam, additional, Meier, Andreas Carlos, additional, Allaart, Marc, additional, Ardelean, Magdalena, additional, Arseni, Maxim, additional, Bösch, Tim, additional, Brenot, Hugues, additional, Calcan, Andreea, additional, Dekemper, Emmanuel, additional, Donner, Sebastian, additional, Dörner, Steffen, additional, Dragomir, Carmelia, additional, Georgescu, Lucian, additional, Nemuc, Anca, additional, Nicolae, Doina, additional, Pinardi, Gaia, additional, Richter, Andreas, additional, Rosu, Adrian, additional, Ruhtz, Thomas, additional, Schönhardt, Anja, additional, Schuettemeyer, Dirk, additional, Shaiganfar, Reza, additional, Stebel, Kerstin, additional, Tack, Frederik, additional, Nicolae Vâjâiac, Sorin, additional, Vasilescu, Jeni, additional, Vanhamel, Jurgen, additional, Wagner, Thomas, additional, and Van Roozendael, Michel, additional
- Published
- 2020
- Full Text
- View/download PDF
42. New Algorithm for the Retrieval of Aerosol's Optical Parameters by LIDAR Data Inversion
- Author
-
Talianu, Camelia, primary, Nicolae, Doina, additional, Cristescu, C. P., additional, Ciuciu, Jeni, additional, Nemuc, Anca, additional, Carstea, Emil, additional, Belegante, Livio, additional, and Ciobanu, Mircea, additional
- Published
- 2007
- Full Text
- View/download PDF
43. The unprecedented 2017–2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET
- Author
-
Baars, Holger, primary, Ansmann, Albert, additional, Ohneiser, Kevin, additional, Haarig, Moritz, additional, Engelmann, Ronny, additional, Althausen, Dietrich, additional, Hanssen, Ingrid, additional, Gausa, Michael, additional, Pietruczuk, Aleksander, additional, Szkop, Artur, additional, Stachlewska, Iwona S., additional, Wang, Dongxiang, additional, Reichardt, Jens, additional, Skupin, Annett, additional, Mattis, Ina, additional, Trickl, Thomas, additional, Vogelmann, Hannes, additional, Navas-Guzmán, Francisco, additional, Haefele, Alexander, additional, Acheson, Karen, additional, Ruth, Albert A., additional, Tatarov, Boyan, additional, Müller, Detlef, additional, Hu, Qiaoyun, additional, Podvin, Thierry, additional, Goloub, Philippe, additional, Veselovskii, Igor, additional, Pietras, Christophe, additional, Haeffelin, Martial, additional, Fréville, Patrick, additional, Sicard, Michaël, additional, Comerón, Adolfo, additional, Fernández García, Alfonso Javier, additional, Molero Menéndez, Francisco, additional, Córdoba-Jabonero, Carmen, additional, Guerrero-Rascado, Juan Luis, additional, Alados-Arboledas, Lucas, additional, Bortoli, Daniele, additional, Costa, Maria João, additional, Dionisi, Davide, additional, Liberti, Gian Luigi, additional, Wang, Xuan, additional, Sannino, Alessia, additional, Papagiannopoulos, Nikolaos, additional, Boselli, Antonella, additional, Mona, Lucia, additional, D'Amico, Giuseppe, additional, Romano, Salvatore, additional, Perrone, Maria Rita, additional, Belegante, Livio, additional, Nicolae, Doina, additional, Grigorov, Ivan, additional, Gialitaki, Anna, additional, Amiridis, Vassilis, additional, Soupiona, Ourania, additional, Papayannis, Alexandros, additional, Mamouri, Rodanthi-Elisaveth, additional, Nisantzi, Argyro, additional, Heese, Birgit, additional, Hofer, Julian, additional, Schechner, Yoav Y., additional, Wandinger, Ulla, additional, and Pappalardo, Gelsomina, additional
- Published
- 2019
- Full Text
- View/download PDF
44. Two-dimensional mineral dust radiative effect calculations from CALIPSO observations over Europe
- Author
-
Granados-Muñoz, Maria José, primary, Sicard, Michaël, additional, Papagiannopoulos, Nikolaos, additional, Barragán, Rubén, additional, Bravo-Aranda, Juan Antonio, additional, and Nicolae, Doina, additional
- Published
- 2019
- Full Text
- View/download PDF
45. High-resolution airborne imaging DOAS measurements of NO2 above Bucharest during AROMAT
- Author
-
Meier, Andreas Carlos, Schönhardt, Anja, Bösch, Tim, Richter, Andreas, Seyler, André, Ruhtz, Thomas, Constantin, Daniel-Eduard, Shaiganfar, Reza, Wagner, Thomas, Merlaud, Alexis, Roozendael, Michel, Belegante, Livio, Nicolae, Doina, Georgescu, Lucian, and Burrows, John Philip
- Subjects
lcsh:TA715-787 ,lcsh:Earthwork. Foundations ,lcsh:TA170-171 ,lcsh:Environmental engineering - Abstract
In this study we report on airborne imaging DOAS measurements of NO2 from two flights performed in Bucharest during the AROMAT campaign (Airborne ROmanian Measurements of Aerosols and Trace gases) in September 2014. These measurements were performed with the Airborne imaging Differential Optical Absorption Spectroscopy (DOAS) instrument for Measurements of Atmospheric Pollution (AirMAP) and provide nearly gapless maps of column densities of NO2 below the aircraft with a high spatial resolution of better than 100 m. The air mass factors, which are needed to convert the measured differential slant column densities (dSCDs) to vertical column densities (VCDs), have a strong dependence on the surface reflectance, which has to be accounted for in the retrieval. This is especially important for measurements above urban areas, where the surface properties vary strongly. As the instrument is not radiometrically calibrated, we have developed a method to derive the surface reflectance from intensities measured by AirMAP. This method is based on radiative transfer calculation with SCIATRAN and a reference area for which the surface reflectance is known. While surface properties are clearly apparent in the NO2 dSCD results, this effect is successfully corrected for in the VCD results. Furthermore, we investigate the influence of aerosols on the retrieval for a variety of aerosol profiles that were measured in the context of the AROMAT campaigns. The results of two research flights are presented, which reveal distinct horizontal distribution patterns and strong spatial gradients of NO2 across the city. Pollution levels range from background values in the outskirts located upwind of the city to about 4 × 1016 molec cm−2 in the polluted city center. Validation against two co-located mobile car-DOAS measurements yields good agreement between the datasets, with correlation coefficients of R = 0.94 and R = 0.85, respectively. Estimations on the NOx emission rate of Bucharest for the two flights yield emission rates of 15.1 ± 9.4 and 13.6 ± 8.4 mol s−1, respectively.
- Published
- 2017
46. Biomass burning events measured by lidars in EARLINET - Part 2: Optical properties investigation.
- Author
-
Adam, Mariana, Stachlewska, Iwona S., Mona, Lucia, Papagiannopoulos, Nikolaos, Bravo-Aranda, Juan Antonio, Sicard, Michaël, Nicolae, Doina, Belegante, Livio, Janicka, Lucja, Szczepanik, Dominika, Mylonaki, Maria, Papanikolaou, Christina-Anna, Siomos, Nikolaos, Voudouri, Kalliopi Artemis, Alados-Arboledas, Luca, Apituley, Arnoud, Mattis, Ina, Chaikovsky, Anatoli, Munoz-Porcar, Constantino, and Pietruczuk, Aleksander
- Abstract
Biomass burning episodes measured at 14 stations of the European Aerosol Research Lidar Network (EARLINET) over 20082017 were analysed using the methodology described in "Biomass burning events measured by lidars in EARLINET -- Part 1: Data analysis methodology" (Adam et al., 2020, this issue). The smoke layers were identified in lidar optical properties profiles. A number of 795 layers for which we measured at least one intensive parameter was analysed. These layers were geographically distributed as follows: 399 layers observed in South-East Europe, 119 layers observed in South-West Europe, 243 layers observed in North-East Europe, and 34 layers observed in Central Europe. The mean layer intensive parameters are discussed following two research directions: (I) the long-range transport of smoke particles from North America, and (II) the smoke properties (fresh versus aged), separating the smoke events into four continental source regions (European, North American, African, Asian or a mixture of two), based on back trajectory analysis. The smoke detected in Central Europe (Cabauw, Leipzig, and Hohenpeißenberg) was mostly transported from North America (87% of fires). In North-East Europe (Belsk, Minsk, Warsaw) smoke advected mostly from Eastern Europe (Ukraine and Russia), but there was a significant contribution (31%) from North America. In South-West Europe (Barcelona, Evora, Granada) smoke originated mainly from the Iberian Peninsula and North Africa (while 9% were originating in North America). In the South-East Europe (Athens, Bucharest, Potenza, Sofia, Thessaloniki) the origin of the smoke was mostly local (only 3% represented North America smoke). The following features, correlated with the increased smoke travel time (corresponding to aging) were found: the colour ratio of the lidar ratio (i.e., the ratio of the lidar ratio at 532 nm to the lidar ratio at 355 nm) and the colour ratio of the backscatter Ängström exponent (i.e., the ratio of the backscatter-related Angstrom exponent for the pair 532 nm -- 1064 nm to the one for the pair 355 nm -- 532 nm) increase, while the extinction Ängström exponent and the colour ratio of the particle depolarization ratio (i.e., the ratio of the particle linear depolarization ratio at 532 nm to the particle depolarization ratio at 355 nm) decrease. The smoke originating from all continental regions can be characterized on average as aged smoke, with a very few exceptions. In general, the long range transported smoke shows higher lidar ratio and lower depolarization ratio compared to the local smoke. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
47. A novel method of identifying and analysing oil smoke plumes based on synergic satellite data.
- Author
-
Mereuță, Alexandru, Ajtai, Nicolae, Radovici, Andrei T., Papagiannopoulos, Nikolaos, Deaconu, Lucia T., Botezan, Camelia S., țtefănie, Horațiu I., Nicolae, Doina, and Ozunu, Alexandru
- Abstract
Black carbon aerosols are the second largest contributor to global warming while also being linked to respiratory and cardiovascular disease. These particles are generally found in smoke plumes originating from biomass burning and fossil fuel combustion. They are also heavily concentrated in smoke plumes originating from oil fires exhibiting the largest ratio of black carbon to organic carbon. In this study, we identified and analyzed oil smoke plumes derived from 30 major industrial events within a 12-year timeframe. To our knowledge, this is the first study of its kind that utilized a synergetic approach based on satellite remote sensing techniques. One objective of this study is to highlight the importance of satellite remote sensing techniques in identifying these types of events. As opposed to ground stations, satellite data offers access to remote areas all over the globe which would otherwise be very difficult to reach. Satellite data offers access to these events which, as seen in this study, are mainly located in war prone or hazardous areas. This study focuses on the use of MODIS (Moderate Resolution Imaging Spectroradiometer) and CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations) products regarding these types of aerosol while also highlighting their intrinsic limitations. By using data from both MODIS instruments onboard Terra and Aqua satellites we addressed the temporal evolution of the smoke plume while assessing Lidar specific properties and plume elevation using CALIPSO data. We present several aerosol properties in the form of plume specific averaged values. The MODIS ocean algorithms were successful in retrieving aerosol properties which, on average, ranged from -0.06 to 0.16 for plume specific AOD, - 0.18 to 1.25 for Ångström exponent and 0.29 to 1.73 μm for the effective radius. CALIPSO measurements showed values of plume AOD ranging from 0 to 0.14 (532 nm) and 0 to 0.13 (1064 nm) except for one event where AOD values showed 1.52 (532 nm) and 1.42 (1064 nm). AE values ranged from 0.11 to 0.33 which were in agreeance with MODIS values. A large discrepancy can be found in one event where CALIPSO measured AOD values 5 times higher than MODIS. This event also produced the largest lidar ratio at 109 sr (532 nm) and 86 (1064 nm). Other lidar ratio values ranged from 37 to 55 sr however these unconstrained solutions were obtained for the entire layer of which the plumes were a part of and thus did not reflect specific plume conditions. Particulate backscatter values ranged from 0.002 to 0.0017km-1 sr-1 while extinction coefficient values ranged from 0.10 to 1.65 km-1. On average backscatter and extinction coefficient values were 2 to 9 times higher than local background values. Particulate depolarization ratios ranged from 0.11 to 0.15 in 4 out of 6 cases while the remaining two ranged from 0.27 to 0.32 where dust was highly dominant. The values represented in this study are in good agreement with similar studies that used ground based and flight measurements. We believe that MODIS values are a conservative estimation of plume AOD since MODIS algorithms rely on general aerosol models and various atmospheric conditions within the look-up tables which do not reflect the highly absorbing nature of these smoke plumes. CALIPSO measurements are heavily dependent on lidar ratios which are not directly measured if plumes within the planetary boundary layer. We also believe that AOD values based on CALIPSO measurements are conservative in nature since heavy absorbing smoke would yield larger lidar ratios and AOD values. Based on this study we conclude that the MODIS land algorithms are not yet suited for retrieving aerosol properties for these types of smoke plumes due to the strong absorbing properties of these aerosols. We believe that these types of studies are a strong indicator for the need of improved aerosol models and retrieval algorithms. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
48. Multiyear Typology of Long-Range Transported Aerosols over Europe
- Author
-
Nicolae, Victor, Talianu, Camelia, Andrei, Simona, Antonescu, Bogdan, Ene, Dragoș, Nicolae, Doina, Dandocsi, Alexandru, Toader, Victorin-Emilian, Ștefan, Sabina, Savu, Tom, and Vasilescu, Jeni
- Subjects
aerosol typing ,photometry ,EARLINET ,lcsh:Meteorology. Climatology ,lcsh:QC851-999 ,complex mixtures ,AERONET ,lidar - Abstract
In this study, AERONET (Aerosol Robotic Network) and EARLINET (European Aerosol Research Lidar Network) data from 17 collocated lidar and sun photometer stations were used to characterize the optical properties of aerosol and their types for the 2008&ndash, 2018 period in various regions of Europe. The analysis was done on six cluster domains defined using circulation types around each station and their common circulation features. As concluded from the lidar photometer measurements, the typical aerosol particles observed during 2008&ndash, 2018 over Europe were medium-sized, medium absorbing particles with low spectral dependence. The highest mean values for the lidar ratio at 532 nm were recorded over Northeastern Europe and were associated with Smoke particles, while the lowest mean values for the Angstrom exponent were identified over the Southwest cluster and were associated with Dust and Marine particles. Smoke (37%) and Continental (25%) aerosol types were the predominant aerosol types in Europe, followed by Continental Polluted (17%), Dust (10%), and Marine/Cloud (10%) types. The seasonal variability was insignificant at the continental scale, showing a small increase in the percentage of Smoke during spring and a small increase of Dust during autumn. The aerosol optical depth (AOD) slightly decreased with time, while the Angstrom exponent oscillated between &ldquo, hot and smoky&rdquo, years (2011&ndash, 2015) on the one hand and &ldquo, dusty&rdquo, years (2008&ndash, 2010) and &ldquo, wet&rdquo, years (2017&ndash, 2018) on the other hand. The high variability from year to year showed that aerosol transport in the troposphere became more and more important in the overall balance of the columnar aerosol load.
- Published
- 2019
49. The unprecedented 2017 - 2018 stratospheric smoke event: decay phase and aerosol properties observed with the EARLINET
- Author
-
Baars, Holger, Ansmann, Albert, Ohneiser, Kevin, Haarig, Moritz, Engelmann, Ronny, Althausen, Dietrich, Hanssen, Ingrid, Gausa, Michael, Pietruczuk, Aleksander, Szkop, Artur, Stachlewska, Iwona S., Wang, Dongxiang, Reichardt, Jens, Skupin, Annett, Mattis, Ina, Trickl, Thomas, Vogelmann, Hannes, Navas-Guzmán, Francisco, Haefele, Alexander, Acheson, Karen, Ruth, Albert A., Tatarov, Boyan, Müller, Detlef, Hu, Qiaoyun, Podvin, Thierry, Goloub, Philippe, Veselovskii, Igor, Pietras, Christophe, Haeffelin, Martial, Fréville, Patrick, Sicard, Michaël, Comerón, Adolfo, Fernández García, Alfonso Javier, Molero Menéndez, Francisco, Córdoba-Jabonero, Carmen, Guerrero-Rascado, Juan Luis, Alados-Arboledas, Lucas, Bortoli, Daniele, Costa, Maria João, Dionisi, Davide, Liberti, Gian Luigi, Wang, Xuan, Sannino, Alessia, Papagiannopoulos, Nikolaos, Boselli, Antonella, Mona, Lucia, D&, apos, Amico, Giuseppe, Romano, Salvatore, Perrone, Maria Rita, Belegante, Livio, Nicolae, Doina, Grigorov, Ivan, Gialitaki, Anna, Amiridis, Vassilis, Soupiona, Ourania, Papayannis, Alexandros, Mamouri, Rodanthi-Elisaveth, Nisantzi, Argyro, Heese, Birgit, Hofer, Julian, Schechner, Yoav Y., Wandinger, Ulla, and Pappalardo, Gelsomina
- Subjects
Earth sciences ,EARLINET ,stratospheric smoke ,ddc:550 ,lidar - Abstract
Six months of stratospheric aerosol observations with the European Aerosol Research Lidar Network (EARLINET) from August 2017 to January 2018 are presented. The decay phase of an unprecedented, record-breaking stratospheric perturbation caused by wildfire smoke is reported and discussed in terms of geometrical, optical, and microphysical aerosol properties. Enormous amounts of smoke were injected into the upper troposphere and lower stratosphere over fire areas in western Canada on 12 August 2017 during strong thunderstorm–pyrocumulonimbus activity. The stratospheric fire plumes spread over the entire Northern Hemisphere in the following weeks and months. Twenty-eight European lidar stations from northern Norway to southern Portugal and the eastern Mediterranean monitored the strong stratospheric perturbation on a continental scale. The main smoke layer (over central, western, southern, and eastern Europe) was found at heights between 15 and 20 km since September 2017 (about 2 weeks after entering the stratosphere). Thin layers of smoke were detected at heights of up to 22–23 km. The stratospheric aerosol optical thickness at 532 nm decreased from values > 0.25 on 21–23 August 2017 to 0.005–0.03 until 5–10 September and was mainly 0.003–0.004 from October to December 2017 and thus was still significantly above the stratospheric background (0.001–0.002). Stratospheric particle extinction coefficients (532 nm) were as high as 50–200 Mm−1 until the beginning of September and on the order of 1 Mm−1 (0.5–5 Mm−1) from October 2017 until the end of January 2018. The corresponding layer mean particle mass concentration was on the order of 0.05–0.5 µg m−3 over these months. Soot particles (light-absorbing carbonaceous particles) are efficient ice-nucleating particles (INPs) at upper tropospheric (cirrus) temperatures and available to influence cirrus formation when entering the tropopause from above. We estimated INP concentrations of 50–500 L−1 until the first days in September and afterwards 5–50 L−1 until the end of the year 2017 in the lower stratosphere for typical cirrus formation temperatures of −55 ∘C and an ice supersaturation level of 1.15. The measured profiles of the particle linear depolarization ratio indicated a predominance of nonspherical smoke particles. The 532 nm depolarization ratio decreased slowly with time in the main smoke layer from values of 0.15–0.25 (August–September) to values of 0.05–0.10 (October–November) and
- Published
- 2019
- Full Text
- View/download PDF
50. Comparison of two automated aerosol typing methods and their application on an EARLINET station
- Author
-
Voudouri, Kalliopi Artemis, Siomos, Nikolaos, Michailidis, Konstantinos, Papagiannopoulos, Nikolaos, Mona, Lucia, Cornacchia, Carmela, Nicolae, Doina, and Balis, Dimitris
- Subjects
010504 meteorology & atmospheric sciences ,0211 other engineering and technologies ,02 engineering and technology ,01 natural sciences ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences - Abstract
In this study we compare two automatic algorithms for the characterization of the aerosol layers derived from a Raman lidar and we test their application over a specific environment in continental Thessaloniki. Both automated aerosol typing methods base their typing on aerosol intensive properties. The methodologies are briefly described and the application on two case studies is presented. The results are checked for their consistency with satellite products and model simulations. Further application of the two classification tools was conducted. The evaluated dataset corresponds to ACTRIS/EARLINET (European Aerosol Research Lidar NETwork) Thessaloniki data acquired during the period 2012–2015. 80 layers out of 116 (percentage of 69 %) were successfully typed by both algorithms and assigned to four major types of aerosols: Dust, Maritime, Polluted Smoke and Clean Continental. The analysis showed that the two algorithms are in a very good agreement, when applied to real atmospheric conditions, with an agreement percentage of 88.8 % for Dust, 93.7 % for Polluted Smoke and 70 % for Clean Continental. The Maritime category was the one with the largest spread. These differences are attributed to differences in defining the aerosol types for the two methods. The overall consistency of the aerosol typing between the two automatic procedures despite the different aerosol type definition, allows their applicability to lidar data for characterization purposes. The joint characterization shows the highest degree of confidence in identifying Dust and Polluted Smoke, and emphasizes the need of further investigation for Maritime and Clean Continental type.
- Published
- 2018
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.