A Decade of Aerosol Optical Properties Measurements over Athens, Greece

Atmosphere

Antonis Gkikas¹  Vassilis Amiridis¹  Nikolaos Mihalopoulos²  Evangelos Gerasopoulos²  Ioannis-Panagiotis Raptis²  Stelios Kazadzis³ 

[1] Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, GR15236 Athens, Greece;Institute for Environmental Research and Sustainable Development, National Observatory of Athens, GR15236 Athens, Greece;Physicalisch-Meteorologisches Observatorium Davos, World Radiation Center, CH-7260 Davos, Switzerland;

关键词: aerosols;    climatology;    aeronet;    athens;    modis;    aerosol classification;    aerosol trends;   

DOI  :  10.3390/atmos11020154

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown