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Identification of the Aerosol Types over Athens, Greece: The Influence
of Air-Mass Transport
Kaskaoutis, D. G.
Kosmopoulos, P. G.
Kambezidis, H. D. and
Nastos, P. T.
Aerosol optical depth at 550nm (AOD(550)) and fine-mode (FM) fraction
data from Terra-MODIS were obtained over the Greater Athens Area
covering the period February 2000-December 2005. Based on both AOD(550)
and FM values three main aerosol types have been discriminated
corresponding to urban/industrial aerosols, clean maritime conditions,
and coarse-mode, probably desert dust, particles. Five main sectors were
identified for the classification of the air-mass trajectories, which
were further used in the analysis of the (AOD(550) and FM data for the
three aerosol types). The HYSPLIT model was used to compute back
trajectories at three altitudes to investigate the relation between
AOD(550)-FM and wind sector depending on the altitude. The accumulation
of local pollution is favored in spring and corresponds to air masses at
lower altitudes originating from Eastern Europe and the Balkan. Clean
maritime conditions are rare over Athens, limited in the winter season
and associated with air masses from the Western or Northwestern sector.
The coarse-mode particles origin seems to be more complicated
proportionally to the season. Thus, in summer the Northern sector
dominates, while in the other seasons, and especially in spring, the air
masses belong to the Southern sector enriched with Saharan dust
aerosols.
(EN)
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