A5090286585- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Solar Radiation and Photovoltaics
- Atmospheric and Environmental Gas Dynamics
- Calibration and Measurement Techniques
- Impact of Light on Environment and Health
- Air Quality and Health Impacts
- Aeolian processes and effects
- Air Quality Monitoring and Forecasting
- Urban Heat Island Mitigation
- Climate Change and Health Impacts
- Meteorological Phenomena and Simulations
- COVID-19 impact on air quality
- Remote Sensing in Agriculture
- Solar and Space Plasma Dynamics
- Indoor Air Quality and Microbial Exposure
- Photovoltaic System Optimization Techniques
- Fire effects on ecosystems
- Geophysics and Gravity Measurements
- Energy and Environment Impacts
- Cryospheric studies and observations
- Water Quality Monitoring and Analysis
- Satellite Image Processing and Photogrammetry
- Climate variability and models
Physikalisch-Meteorologisches Observatorium Davos
2016-2025
National Observatory of Athens
2014-2024
University of Naples Federico II
2021
Utah State University
2021
University of Crete
2018
Met Office
2018
National and Kapodistrian University of Athens
2018
National Institute of Research and Development for Optoelectronics
2018
Vodafone (Greece)
2017
Finnish Meteorological Institute
2001-2015
Abstract. Black carbon, light-absorbing organic carbon (often called "brown carbon") and mineral dust are the major aerosols. Currently sources formation of brown aerosol in particular not well understood. In this study we estimated amount light–absorbing black from AERONET measurements. We find that columnar absorbing (brown carbon) levels biomass burning regions South America Africa relatively high (about 15–20 mg m−2 during season), while concentrations significantly lower urban areas US...
Abstract. We present a 3-D climatology of the desert dust distribution over South and East Asia derived using CALIPSO (Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observation) data. To distinguish from total aerosol load we apply methodology developed in framework EARLINET (European Aerosol Research Network). The method involves use particle linear depolarization ratio updated lidar values suitable for Asian dust, applied to multiyear observations (January 2007–December 2015)....
Abstract. Monitoring and describing the spatiotemporal variability in dust aerosols is crucial for understanding their multiple effects, related feedbacks, impacts within Earth system. This study describes development of ModIs Dust AeroSol (MIDAS) data set. MIDAS provides columnar daily optical depth (DOD) at 550 nm a global scale fine spatial resolution (0.1∘ × 0.1∘) over 15-year period (2003–2017). new set combines quality filtered satellite aerosol (AOD) retrievals from MODIS-Aqua swath...
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...
Abstract. We demonstrate improvements in CALIPSO (Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations) dust extinction retrievals over northern Africa Europe when corrections are applied regarding the Saharan lidar ratio assumption, separation of portion detected mixtures, averaging scheme introduced Level 3 product. First, a universal, spatially constant 58 sr instead 40 is to individual 2 dust-related backscatter products. The resulting aerosol optical depths show an...
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...
Abstract. The regime of intense desert dust (DD) episodes over the broader Mediterranean Basin is studied for period 2000–2007 at a complete spatial coverage. An objective and dynamic algorithm has been set up which uses daily measurements various aerosol optical properties taken by different satellite databases, enabling identification DD their classification into strong extreme ones. algorithm's performance was tested against surface-based (in situ) particulate matter (PM) (columnar)...
Abstract. This paper is an overview of the progress in sky radiometer technology and development network called SKYNET. It found that has produced useful on-site calibration methods, retrieval algorithms, data analyses from observations aerosol, cloud, water vapor, ozone. A formula was proposed for estimating accuracy constant F0 using improved Langley (IL) method, which to be a good approximation observed monthly mean uncertainty F0, around 0.5 % 2.4 at Tokyo Rome sites smaller values 0.3...
Abstract. The main aim of the present study is to describe vertical structure intense Mediterranean dust outbreaks, based on use satellite and surface-based retrievals/measurements. Strong extreme desert (DD) episodes are identified at 1° × spatial resolution, over period March 2000–February 2013, through implementation an updated objective dynamic algorithm. According algorithm, strong DD occurring a specific place correspond cases in which daily aerosol optical depth 550 nm (AOD550 nm)...
Abstract. This study assesses the impact of dust on surface solar radiation focussing an extreme event. For this purpose, we exploited synergy AERONET measurements and passive active satellite remote sensing (MODIS CALIPSO) observations, in conjunction with radiative transfer model (RTM) chemical transport (CTM) simulations 1-day forecasts from Copernicus Atmosphere Monitoring Service (CAMS). The area interest is eastern Mediterranean where anomalously high aerosol loads were recorded...
Abstract. Atmospheric aging promotes internal mixing of black carbon (BC), leading to an enhancement light absorption and radiative forcing. The relationship between BC state consequent was never estimated for found in the Arctic region. In present work, we aim quantify its impact on forcing as a function microphysical properties observed situ at Zeppelin station (78∘ N) spring 2012 during CLIMSLIP (Climate impacts short-lived pollutants polar region) project. Single-particle soot photometer...
Abstract. Numerical prediction of aerosol particle properties has become an important activity at many research and operational weather centers. This development is due to growing interest from a diverse set stakeholders, such as air quality regulatory bodies, aviation military authorities, solar energy plant managers, climate services providers, health professionals. Owing the complexity atmospheric processes their sensitivity underlying meteorological conditions, concentrations in...
In late March 2018, a large part of the Eastern Mediterranean experienced an extraordinary episode African dust, one most intense in recent years, here referred to as "Minoan Red" event. The mainly affected Greek island Crete, where highest aerosol concentrations over past 15 yeas were recorded, although impacts also felt well beyond this core area. Our study fills gap dust research by assessing multi-sectoral sand and storms their socioeconomic implications. Specifically, we provide impact...
Abstract. Quantifying the dust optical depth (DOD) and its uncertainty across spatiotemporal scales is key to understanding constraining cycle interactions with Earth System. This study quantifies DOD along monthly year-to-year variability between 2003 2017 at global regional levels based on MIDAS (ModIs Dust AeroSol) dataset, which combines Moderate Resolution Imaging Spectroradiometer (MODIS)-Aqua retrievals Modern-Era Retrospective Analysis for Research Applications, version 2 (MERRA-2),...
Abstract. Spectral measurements of the aerosol optical depth (AOD) and Ångström coefficient were conducted at Thessaloniki, Greece (40.5° N, 22.9° E) between January 1997 December 2005 with a Brewer MKIII double-monochromator spectroradiometer. The dataset was compared collocated second spectroradiometer (Brewer MKII) CIMEL sun-photometer, showing correlations 0.93 0.98, respectively. A seasonal variation AOD observed values 340 nm 0.52 0.28 for August Back trajectories air masses up to 4...
Abstract. Three years (2006–2008) of ground-based observations the Aerosol Optical Depth (AOD) in urban environment Athens, Eastern Mediterranean, are analysed this work. Measurements were acquired with a Multi-Filter Rotating Shadowband Radiometer at five wavelengths. The daily average AOD 500 nm is 0.23, and mean Ångström coefficient calculated between 415 867 1.41. annual variability has spring maximum dominated by coarse dust particles from Sahara (AOD 0.34–0.42), while diurnal pattern...
This study estimates the impact of dust aerosols on surface solar radiation and energy in Egypt based Earth Observation (EO) related techniques. For this purpose, we exploited synergy monthly mean daily post processed satellite remote sensing observations from MODerate resolution Imaging Spectroradiometer (MODIS), radiative transfer model (RTM) simulations utilizing machine learning, conjunction with 1-day forecasts Copernicus Atmosphere Monitoring Service (CAMS). As cloudy conditions region...
A record-breaking dust episode took place in Crete on 22 March 2018. The event was characterized by surface concentrations exceeding 1 mg m−3 for a period of 4–7 h, reaching record values higher than 6 at the background station Finokalia. We present here detailed analysis atmospheric dynamical processes during this period, to identify main reasons such extreme advection over Crete. At synoptic scale, weakening polar vortex and meridional transport air masses upper tropospheric layers...
Long-term ground-based measurements of aerosol optical properties in Athens, Greece, for the period 2008–2018 performed by National Observatory Athens are used order to investigate climatology area. In this study, we utilize quality-assured depth (AOD), Single Scattering Albedo (SSA) and Ångström exponent obtained CIMEL photometers framework Aerosol Robotic Network (AERONET) extract seasonality trends aerosols region. Higher loads found during spring summer months. A 1.1% per year decrease...
Abstract. The World Optical Depth Research Calibration Center (WORCC) is a section within the Radiation at Physikalisches-Meteorologisches Observatorium (PMOD/WRC), Davos, Switzerland, established after recommendations of Meteorological Organization for calibration aerosol optical depth (AOD)-related Sun photometers. WORCC mandated to develop new methods instrument calibration, initiate homogenization activities among different AOD networks and run network (GAW-PFR) In this work we describe...
Abstract. The aim of this paper is to analyze the suitability high-mountain stations Mauna Loa and Izaña for Langley plot calibration Sun photometers. Thus aerosol optical depth (AOD) characteristics seasonality, as well cloudiness, have been investigated in order provide a robust estimation uncertainty number days that are suitable calibrations. data used investigations belong AERONET GAW-PFR networks, which maintain reference photometers at these with long measurement records: 22 years 15...