A5052239878- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Fire effects on ecosystems
- Aeolian processes and effects
- Impact of Light on Environment and Health
- Geochemistry and Geologic Mapping
- Optical Imaging and Spectroscopy Techniques
- Solar Radiation and Photovoltaics
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Planetary Science and Exploration
- Satellite Image Processing and Photogrammetry
- Calibration and Measurement Techniques
National Observatory of Athens
2020-2025
Aristotle University of Thessaloniki
2020-2025
Between 30 May and 6 June 2019 a series of new flanks eruptions interested the south-east Mt. Etna, Italy, forming lava flows explosive activity that was most intense during first day eruption; as result, volcanic particles were dispersed towards Greece. Lidar measurements performed at PANhellenic GEophysical observatory Antikythera (PANGEA) National Observatory Athens (NOA), in Greece, reveal presence origin above area days following eruption. FLEXible PARTicle dispersion model (FLEXPART)...
Abstract. A stand-alone lidar-based method for detecting airborne hazards aviation in near real time (NRT) is presented. polarization lidar allows the identification of irregular-shaped particles such as volcanic dust and desert dust. The Single Calculus Chain (SCC) European Aerosol Research Lidar Network (EARLINET) delivers high-resolution preprocessed data: calibrated total attenuated backscatter volume linear depolarization ratio series. From these signals, particle coefficient can be...
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...
Abstract. Modeling the dispersion of volcanic particles following explosive eruptions is critical for aviation safety. To constrain plumes and assess hazards, calculations rely on accurate characterization source term e.g., variation emission rate column height with time prevailing wind fields. This study introduces an inverse modeling framework that integrates a Lagrangian model lidar observations to estimate rates released during Etna eruption. The methodology consists using FLEXPART...
The presence of aerosols in the stratosphere alters spectral shape, amount and spatial distribution solar light that reaches Earth surface. Such changes surface radiation have been discussed a few studies, but role underlying tropospheric aerosol layer stratospheric has not considered. In this study we investigate direct global irradiances following extremely intense volcanic eruption (VEI=6) Mount Pinatubo (15°N, 120°E) June 1991. ejected massive loads sulphate ash...
The dispersion of volcanic ash from explosive eruptions plays a critical role in aviation safety. Accurate hazard assessments depend on reliable characterization eruption dynamics, including variations emission rates, column height, and wind fields. This study proposes novel inverse modeling approach, combining lidar observations with Lagrangian model to estimate the rates particles 2021 Etna eruption. Using FLEXPART model, we establish source-receptor relationships between volcano an...
Abstract. We examine the capability of near-spherical-shaped particles to reproduce triple-wavelength particle linear depolarization ratio (PLDR) and lidar (LR) values measured over Europe for stratospheric smoke originating from Canadian wildfires. The layers were detected both in troposphere stratosphere, though latter case presented PLDR almost 18 % at 532 nm as well a strong spectral dependence UV near-IR wavelength. Although recent simulation studies rather complicated morphologies have...
Abstract Forecasting volcanic ash atmospheric pathways is of utmost importance for aviation. Volcanic can interfere with aircraft navigational instruments and damage engine parts. Early warning systems, activated after eruptions alleviate the impacts on aviation by providing forecasts plume dispersion. The quality these short-term subject to accuracy meteorological wind fields used initialization regional models. Here, we use profiling data from first high spectral resolution lidar in space,...
Abstract. A new four-dimensional, multiyear, and near-global climate data record of the fine-mode (submicrometer in terms diameter) coarse-mode (supermicrometer components atmospheric pure dust is presented. The separation two modes detected layers based on a combination (1) total pure-dust product provided by well-established European Space Agency (ESA) “LIdar climatology Vertical Aerosol Structure” (LIVAS) database (2) component first step two-step POlarization LIdar PHOtometer Networking...
Atmospheric-chemical coupled models usually parameterize sea-salt aerosol (SSA) emissions using whitecap fraction estimated considering only wind speed and ignoring sea state. This approach may introduce inaccuracies in SSA simulation. study aims to assess the impact of state on modeling, applying a new parameterization for estimation based wave age, calculated by ratio between phase velocity speed. To this end, was incorporated Chemical Hydrological Atmospheric Ocean modeling System...
Abstract. Since 2018, the Aeolus satellite of European Space Agency (ESA) has acquired wind HLOS (horizontal line-of-sight) profiles throughout troposphere and up to lower stratosphere, filling a critical gap in Global Observing System (GOS). Aeolus, carrying ALADIN (Atmospheric LAser Doppler INstrument), first UV HSRL (High Spectral Resolution Lidar) lidar ever placed space, provides also vertically resolved optical properties particulates (aerosols clouds). The present study focuses on...
Abstract. Land–atmosphere interactions govern the process of dust emission and transport. An accurate depiction these physical processes within numerical weather prediction models allows for better estimating spatial temporal distribution burden characterisation source recipient areas. In presented study, ECMWF-IFS (European Centre Medium-Range Weather Forecast – Integrated Forecasting System) outputs, produced with without assimilation Aeolus quality-assured Rayleigh–clear Mie–cloudy...
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 same period due to prevailing southern winds. The impact these on and surface solar radiation are investigated this study. Event characterization based active passive remote sensing instrumentation has been performed. study shows significantly increased levels pollution were during end July/first...
Abstract. A new four-dimensional, multiyear, and near-global climate data record of the fine-mode (submicrometer in terms diameter) coarse-mode (supermicrometer components atmospheric pure-dust, is presented. The separation two modes dust detected layers based on a combination (1) total pure-dust product provided by well-established European Space Agency (ESA) – “LIdar climatology Vertical Aerosol Structure” (LIVAS) database (2) component first-step two-step POlarization LIdar PHOtometer...
The objective of this study was the estimation dynamic evolution Planetary Boundary Layer (PBL) height, using advanced remote sensing measurements from Finokalia Station, where Pre-TECT Campaign took place during 1–26 April 2017. PollyXT Raman Lidar and Halo Wind Doppler profiles were used to daily vertical PBL. Wavelet Covariance Transform (WCT) Threshold Method (TM) performed on different products acquired Lidars. According analysis, all methods are able provide reasonable boundary-layer...
In the framework of ESA-NASA Joint Aeolus Tropical Atlantic Campaign (JATAC), ASKOS experiment was implemented during summer and autumn 2021 2022. comprised roughly 9 weeks measurements in Saharan dust outflow towards North Atlantic, with operations conducted from Cabo Verde Islands. Through its unprecedented dataset synergistic region, will allow for calibration validation aerosol/cloud product preparation terrain EarthCARE cal/val activities. Moreover, marks a turning point our ability to...
In this paper, characterization of the optical and microphysical properties extremely fresh biomass burning aerosol is presented. This work aims to characterize, for first time our knowledge, freshly formed smoke particles observed only a few minutes after they were emitted from nearby forest fire. The detected by combining passive (sun-photometer) active (Raman lidar) techniques. On 14 August 2021, an EARLINET (European Aerosol Research Lidar Network) multi-wavelength Raman lidar co-located...
Abstract. A stand-alone lidar-based method for detecting airborne hazards aviation in near-real-time (NRT) is presented. polarization lidar allows the identification of irregular-shaped particles such as volcanic dust and desert dust. The Single Calculus Chain (SCC) European Aerosol Lidar Network (EARLINET) delivers high resolution pre-processed data: calibrated total attenuated backscatter volume linear depolarization ratio time series. From these signals, particle coefficient can be...
Abstract. The European Aerosol Research Lidar Network (EARLINET), part of the Aerosols, Clouds and Trace gases Infrastructure (ACTRIS), organized an intensive observational campaign in May 2020, with objective monitoring atmospheric state over Europe during COVID-19 lockdown relaxation period. Besides standard operational processing lidar data EARLINET, for seven EARLINET sites having collocated sun-photometric observations Robotic (AERONET), a network exercise was held order to derive...
EarthCARE, ESA’s and JAXA’s joint mission, is expected to launch in 2024 carrying ATLID, a high-spectral resolution lidar with depolarization capability. The instrument will provide valuable data for characterizing atmospheric aerosols improving composition modelling. aim of this study show how working Aeolus wind mission prepares us taking advantage ATLID. Aeolus, which launched 2018 deorbited 2023, was not specifically designed observe but still provided aerosol...
Dust aerosols play a key role in the Earth’s radiation budget, climate system, environmental conditions, and human health. However, complex of dust depends not only on physical chemical properties, but addition to particle size distribution, spanning from less than 0.1 μm more 100 diameter. Larger mineral particles are efficiently removed through dry deposition close source regions act as CCN and/or IN fine-mode particles, whereas fine prominent long-range transport,...