A5011336254- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Meteorological Phenomena and Simulations
- Aeolian processes and effects
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Fire effects on ecosystems
- Remote Sensing in Agriculture
- Laser Design and Applications
- Solid State Laser Technologies
- Calibration and Measurement Techniques
- Remote Sensing and LiDAR Applications
- Impact of Light on Environment and Health
- Spectroscopy and Laser Applications
- Urban Heat Island Mitigation
- Retinal Diseases and Treatments
- Geophysics and Gravity Measurements
- Solar Radiation and Photovoltaics
- Astrophysics and Cosmic Phenomena
- Advanced Optical Sensing Technologies
- Photorefractive and Nonlinear Optics
- Ionosphere and magnetosphere dynamics
- Particle Detector Development and Performance
National Technical University of Athens
2015-2024
École Polytechnique Fédérale de Lausanne
2022-2024
InnovaPuglia
2011-2019
Kuwait University
2018
National Research Council - Institute of Methodologies for Environmental Analysis
2006-2010
San Raffaele University of Rome
2010
University of Potsdam
2010
National and Kapodistrian University of Athens
1997-2008
Barcelona Supercomputing Center
2008
Universitat Politècnica de Catalunya
2008
More than 130 observation days of the horizontal and vertical extent Saharan dust intrusions over Europe during period May 2000 to December 2002 were studied by means a coordinated lidar network in frame European Aerosol Research Lidar Network (EARLINET). The number events was greatest late spring, summer, early autumn periods, mainly southern (S) southeastern (SE) Europe. Multiple aerosol layers variable thickness (300–7500 m) observed. center mass these located altitudes between 850 8000...
A strategy for European Aerosol Research Lidar Network (EARLINET) correlative measurements Cloud‐Aerosol and Infrared Pathfinder Satellite Observation (CALIPSO) has been developed. These EARLINET started in June 2006 are still progress. Up to now, more than 4500 files available the database. Independent extinction backscatter carried out at high‐performance stations have used a quantitative comparison with CALIPSO level 1 data. Results demonstrate good performance of absence evident biases...
An intercomparison of the algorithms used to retrieve aerosol extinction and backscatter starting from Raman lidar signals has been performed by 11 groups scientists involved in European Aerosol Research Lidar Network (EARLINET). This is part an extended quality assurance program on lidars EARLINET. instruments were tested separately. The use synthetic data, simulated at 355, 532, 386, 607 nm, with realistic experimental atmospheric conditions taken into account. demonstrates that...
We present the results of our investigations into vertical structure several North African dust plumes exported to Mediterranean in 1997. Two backscatter lidar systems were operated western and eastern parts basin during events identified using Meteosat visible images. Dust transport soundings have shown that particles are trapped transported inside well‐defined layers free troposphere. In general, appeared be multilayered, with distinct at different altitudes between 1.5 5 km. The analysis...
An intercomparison of aerosol backscatter lidar algorithms was performed in 2001 within the framework European Aerosol Research Lidar Network to Establish an Climatology (EARLINET). The objective this research test correctness and influence ratio used by various teams involved EARLINET for calculation backscatter-coefficient profiles from signals. exercise consisted processing synthetic signals degrees difficulty. One these contained height-dependent ratios vertical those on retrieval...
Regular aerosol extinction and backscatter measurements using a UV Raman lidar have been performed from January 2001 to December 2004 at Thessaloniki, Greece (40.5°N, 22.9°E), in the framework of European Aerosol Research Lidar Network (EARLINET). Profiles coefficient, extinction‐to‐backscatter ratio (so‐called “lidar ratio”) were acquired under nighttime conditions used for statistical investigations. The analysis was made both planetary boundary layer free troposphere. It found that 4‐year...
Abstract. We report on the vertical distributions of Saharan dust aerosols over N.E. Mediterranean region, which were obtained during a typical outbreak August 2000, by two lidar systems located in Athens and Thessaloniki, Greece, frame European EARLINET project. MODIS ground sun spectrophotometric data, as well air-mass backward trajectories confirmed existence case examined, was also successfully forecasted DREAM model. The data analysis for period 2000-2002 made possible, first time, an...
Since 2000, regular lidar observations of the vertical aerosol distribution over Europe have been performed within framework EARLINET, European Aerosol Research Lidar Network. A statistical analysis concerning volume light extinction coefficients particles derived from Raman measurements at 10 EARLINET stations is presented here. The profiles were measured on a fixed schedule with up to two per week; they typically covered height range 500 m 6000 above ground level (agl). made for planetary...
Abstract. We present LIVAS (LIdar climatology of Vertical Aerosol Structure for space-based lidar simulation studies), a 3-D multi-wavelength global aerosol and cloud optical database, optimized to be used future end-to-end simulations realistic atmospheric scenarios as well retrieval algorithm testing activities. The database provides averaged profiles properties the potential spaceborne laser operating wavelengths 355, 532, 1064, 1570 2050 nm at wavelength 532 nm. is based on CALIPSO...
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 an unprecedented, record-breaking perturbation caused by wildfire smoke is reported and discussed in terms geometrical, optical, microphysical properties. Enormous amounts were injected into upper troposphere lower stratosphere over fire areas western Canada on 12 during strong thunderstorm–pyrocumulonimbus...
Abstract. This paper presents a detailed description of LIRIC (LIdar-Radiometer Inversion Code) algorithm for simultaneous processing coincident lidar and radiometric (sun photometric) observations the retrieval aerosol concentration vertical profiles. As lidar/radiometric input data we use measurements from European Aerosol Research Lidar Network (EARLINET) lidars collocated sun-photometers Robotic (AERONET). The provides sequential inversion combined data. starts with estimations...
Abstract. The eruption of the Icelandic volcano Eyjafjallajökull in April–May 2010 represents a "natural experiment" to study impact volcanic emissions on continental scale. For first time, quantitative data about presence, altitude, and layering cloud, conjunction with optical information, are available for most parts Europe derived from observations by European Aerosol Research Lidar NETwork (EARLINET). Based multi-wavelength Raman lidar systems, EARLINET is only instrument worldwide that...
We provide an overview of light detection and ranging (lidar) capability for describing characterizing desert dust. This paper summarizes lidar techniques, observations, fallouts dust measurements. The main objective is to the scientific community, including nonpractitioners observations with a reference on In particular, it will fill current gap communication between research-oriented community potential data users, such as air quality monitoring agencies aviation advisory centers....
Abstract. This study investigates the concentration, cloud condensation nuclei (CCN) activity and hygroscopic properties of particles influenced by biomass burning in eastern Mediterranean their impacts on droplet formation. Air masses sampled were subject to a range atmospheric processing (several hours up 3 days). Values hygroscopicity parameter, κ, derived from CCN measurements Hygroscopic Tandem Differential Mobility Analyzer (HTDMA). An Aerosol Chemical Speciation Monitor (ACSM) was...
We present the results of aerosol measurements carried out over Aegean Sea during Photochemical Activity and Solar Ultraviolet Radiation campaign held in Greece June 1996. Simultaneous observations performed with a lidar double-monochromator spectrophotometer allowed us to retrieve optical depth, Ångström coefficient, backscatter-to-extinction ratio. The Sun photometric data can be used improve quantitative by Planetary Boundary Layer. Systematic errors could arise otherwise, because value...
Measurements during Saharan dust transport events were performed at several stations of the European Aerosol Research Lidar Network. During period 2001–2002, 12 cases captured Thessaloniki, Greece (40.5°N, 22.9°E) with a 355 nm Raman lidar. For these vertical profiles extinction and backscatter coefficients determined examined, as well extinction‐to‐backscatter ratio (lidar ratio) backscatter‐related Ångström exponent between 532 (color index). Model calculations from DREAM model confirmed...
Abstract. We present initial aerosol validation results of the space-borne lidar CALIOP -onboard CALIPSO satellite- Level 1 attenuated backscatter coefficient profiles, using coincident observations performed with a ground-based in Athens, Greece (37.9° N, 23.6° E). A multi-wavelength backscatter/Raman system is operating since 2000 at National Technical University Athens (NTUA) framework European Aerosol Research LIdar NETwork (EARLINET), first network for tropospheric studies on...
To study the ozone spatial and temporal evolution in atmosphere, lidar systems have proved to be adequate but remained complex. We define this paper main characteristics of a UV DIAL system for ground based airborne measurements troposphere lower stratosphere both daytime nighttime operation. A multiwavelength using either Rayleigh/Mie signals or Raman nitrogen signal, is discussed as way efficiently correct from systematic bias due aerosol other interference gases (i.e. SO2) troposphere....
Abstract. This study presents an inter-comparison of two active remote sensors (lidar and ceilometer) to determine the mixing layer height structure Planetary Boundary Layer (PBL) retrieve tropospheric aerosol vertical profiles over Athens, Greece. was performed under various strongly different loads/types (urban air pollution, biomass burning Saharan dust event), implementing lidar systems (one portable Raymetrics S.A. system running at 355 nm one multi-wavelength Raman nm, 532 1064 nm)...
Abstract. Systematic measurements of dust concentration profiles at a continental scale were recently made possible by the development synergistic retrieval algorithms using combined lidar and sun photometer data establishment robust remote-sensing networks in framework Aerosols, Clouds, Trace gases Research InfraStructure Network (ACTRIS)/European Aerosol Lidar (EARLINET). We present methodology for these capabilities as tool examining performance transport models. The includes...
Abstract. We present an automatic aerosol classification method based solely on the European Aerosol Research Lidar Network (EARLINET) intensive optical parameters with aim of building a network-wide tool that could provide near-real-time typing information. The presented depends supervised learning technique and makes use Mahalanobis distance function relates each unclassified measurement to predefined type. As first step (training phase), reference dataset is set up consisting already...
Abstract. In August 2021, a historic heatwave was recorded in Greece which resulted extreme wildfire events that strongly affected the air quality over city of Athens. Saharan dust also transferred on certain days same period due to prevailing southern winds. The impact these and surface solar radiation is investigated this study. Event characterization based active passive remote sensing instrumentation has been performed. study shows significantly increased levels pollution were from end...
Forest fires are a major contributor of atmospheric gaseous and particulate pollutants. With respect to forest fires, Greece faces one Europe's most severe problems during summer. To create fire emissions inventory, database which holds data for in the period 1997–2003 was established this study methodology quantification both matter from developed. The contribution pollutant total anthropogenic natural has been estimated detail specific July 2000 when widespread occurred Greek mainland....