A5048408847- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Fire effects on ecosystems
- Spectroscopy and Laser Applications
- Impact of Light on Environment and Health
- Ionosphere and magnetosphere dynamics
- Aeolian processes and effects
- Vehicle emissions and performance
- Solar Radiation and Photovoltaics
- Water Quality Monitoring and Analysis
- Wind and Air Flow Studies
- COVID-19 impact on air quality
- Maritime Transport Emissions and Efficiency
- Particle Detector Development and Performance
- Remote Sensing and LiDAR Applications
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- Urban Heat Island Mitigation
- Ocean Acidification Effects and Responses
Aristotle University of Thessaloniki
2016-2025
German Meteorological Service
2019
Royal Netherlands Meteorological Institute
2010
Royal Belgian Institute for Space Aeronomy
2010
Czech Academy of Sciences, Institute of Physics
2008
National Academy of Sciences of Belarus
2008
Goddard Institute for Space Studies
2007
National and Kapodistrian University of Athens
2007
Academy of Athens
2007
National Observatory of Athens
2007
Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build next generation instrument, factor 5-10 improvement sensitivity 100 GeV 10 TeV range extension energies well below above TeV. will consist two arrays (one north, one south) for full sky coverage be operated as open observatory....
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...
Abstract. In this study we use a new dust product developed using CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) observations EARLINET (European Aerosol Research Network) measurements methods to provide 3-D multiyear analysis on the evolution of Saharan over North Africa Europe. The uses L2 backscatter corrected with depolarization-based method separate pure in external aerosol mixtures lidar ratio (LR) based long-term calculate extinction profiles. methodology...
Abstract. In October 2017, the Sentinel-5 Precursor (S5P) mission was launched, carrying TROPOspheric Monitoring Instrument (TROPOMI), which provides a daily global coverage at spatial resolution as high 7 km × 3.5 and is expected to extend European atmospheric composition record initiated with GOME/ERS-2 in 1995, enhancing our scientific knowledge of processes its unprecedented resolution. Due ongoing need understand monitor recovery ozone layer, well evolution tropospheric pollution, total...
This paper is an overview of the validation total column ozone data products from Ozone Monitoring Instrument (OMI) on board NASA EOS‐Aura satellite. OMI imaging UV/visible spectrometer that maps global a daily basis. There are two OMI, one derived using traditional TOMS retrieval algorithm and another Differential Optical Absorption Spectroscopy being developed to take advantage hyperspectral capabilities OMI. Validation primarily performed through comparison with network Dobson Brewer...
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...
In the framework of European Aerosol Research Lidar Network to Establish an Climatology (EARLINET), 19 aerosol lidar systems from 11 countries were compared. extinction or backscatter coefficient profiles measured by at least two for each comparison. coefficients derived Raman measurements in UV (351 355 nm), and calculated pure elastic 351 355, 532, 1064 nm. The results compared height ranges with high low content. Some additionally sunphotometers starphotometers. Predefined maximum...
In this paper we present validation results of the total ozone column data products Ozone Monitoring Instrument (OMI) on board NASA EOS‐AURA satellite through comparisons with ground‐based observations by Dobson and Brewer spectrophotometer instruments. Quality‐controlled archived from these instruments located at stations worldwide have been used to validate more than 2 a OMI. There are two operationally available products, based OMI‐TOMS OMI‐DOAS retrieval algorithms, respectively....
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...
The Global Ozone Monitoring Instrument (GOME) was launched on European Space Agency's ERS‐2 platform in April 1995. GOME data processor (GDP) operational retrieval algorithm has generated total ozone columns since July In 2004 the GDP system given a major upgrade to version 4.0, new validation performed, and 10‐year level 1 record reprocessed. two papers, we describe 4.0 present an error budget sensitivity analysis (paper 1) of product overall accuracy entire 2). uses optimized differential...
Abstract. The influence of smoke on the aerosol loading in free troposphere over Thessaloniki, Greece is examined this paper. Ten cases during 2001–2005 were identified when very high optical depth values observed with a UV-Raman lidar. Particle dispersion modeling (FLEXPART) and satellite hot spot fire detection (ATSR) showed that these tropospheric depths are mainly attributed to advection plumes from biomass burning regions Thessaloniki. found extend across Russia latitudinal belt between...
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...
[1] The Global Ozone Monitoring Instrument (GOME-2) was launched on EUMESAT's MetOp-A satellite in October 2006. This paper is concerned with the retrieval algorithm GOME Data Processor (GDP) version 4.4 used by EUMETSAT Satellite Application Facility and Atmospheric Chemistry (O3M-SAF) for operational generation of GOME-2 total ozone products. GDP latest 4.0 algorithm, which employed official Level 2 other trace gas products from SCIAMACHY. Here we focus enhancements introduced 4.4:...
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...
Abstract Within the European Space Agency's Climate Change Initiative, total ozone column records from GOME (Global Ozone Monitoring Experiment), SCIAMACHY (SCanning Imaging Absorption SpectroMeter for Atmospheric CartograpHY), and GOME‐2 have been reprocessed with GODFIT version 3 (GOME‐type Direct FITting). This algorithm is based on direct fitting of reflectances simulated in Huggins bands to observations. We report new developments implemented operational Data Processor v5. The a priori...
Abstract. Sulfur dioxide (SO2) is an important atmospheric constituent that plays a crucial role in many processes. Volcanic eruptions are significant source of SO2 and its effects lifetime depend on the injection altitude. The Infrared Atmospheric Sounding Interferometer (IASI) METOP satellite can be used to study volcanic emission using high-spectral resolution measurements from 1000 1200 1300 1410 cm−1 (the 7.3 8.7 µm bands) returning both amount altitude data. scheme described Carboni et...
Abstract. This paper assesses the quality of IASI (Infrared Atmospheric Sounding Interferometer)/Metop-A (IASI-A) and IASI/Metop-B (IASI-B) ozone (O3) products (total partial O3 columns) retrieved with Fast Optimal Retrievals on Layers for Ozone (FORLI-O3; v20151001) software 9 years (2008–July 2017) through an extensive intercomparison validation exercise using independent observations (satellite, ground-based ozonesonde). Compared previous version FORLI-O3 (v20140922), several improvements...
Abstract. The unprecedented order, in modern peaceful times, for a near-total lockdown of the Greek population as means protection against severe acute respiratory syndrome coronavirus 2, commonly known COVID-19, has generated unintentional positive side-effects with respect to country's air quality levels. Sentinel-5 Precursor/Tropospheric Monitoring Instrument (S5P/TROPOMI) monthly mean tropospheric nitrogen dioxide (NO2) observations show an average change −34 % +20 and −39 −5 decrease...
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...