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Open AccessArticle

A Decade of Aerosol Optical Properties Measurements over Athens, Greece

1
Institute for Environmental Research and Sustainable Development, National Observatory of Athens, GR15236 Athens, Greece
2
Physicalisch-Meteorologisches Observatorium Davos, World Radiation Center, CH-7260 Davos, Switzerland
3
Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, GR15236 Athens, Greece
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(2), 154; https://doi.org/10.3390/atmos11020154
Received: 5 January 2020 / Revised: 26 January 2020 / Accepted: 28 January 2020 / Published: 30 January 2020
(This article belongs to the Special Issue Changes in the Composition of the Atmosphere)
Long‐term ground-based measurements of aerosol optical properties in Athens, Greece, for the period 2008–2018 performed by the National Observatory of Athens are used in order to investigate the aerosol climatology of the area. In this study, we utilize quality-assured measurements of the aerosol optical depth (AOD), Single Scattering Albedo (SSA) and Ångström exponent obtained by CIMEL photometers in the framework of the Aerosol Robotic Network (AERONET) to extract the seasonality and the trends of aerosols in the region. Higher aerosol loads are found during spring and summer months. A 1.1% per year decrease for AOD at 440 nm and 0.4% decrease per year for SSA during the studied period are recorded. Collocated and synchronous PM10 values, for a five-year period, are used in order to study ground-level conditions. Also, the Planetary Boundary Layer Height from ERA-5 is used to investigate the stratification of the particles. The classification of aerosols using AERONET data is performed to separate dust, biomass burning, polluted urban, marine and continental dominant aerosol mixtures. Also, the characterization of AOD provided by Copernicus Atmosphere Monitoring Service (CAMS) is investigated. Finally, seasonal AOD trends recorded from AERONET from satellite sensors (MODIS-Aqua/MODIS-Terra) and estimated by CAMS are examined, and significant differences have been found.
Keywords: aerosols; climatology; AERONET; Athens; MODIS; aerosol classification; aerosol trends aerosols; climatology; AERONET; Athens; MODIS; aerosol classification; aerosol trends
MDPI and ACS Style

Raptis, I.-P.; Kazadzis, S.; Amiridis, V.; Gkikas, A.; Gerasopoulos, E.; Mihalopoulos, N. A Decade of Aerosol Optical Properties Measurements over Athens, Greece. Atmosphere 2020, 11, 154.

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