Aerosols in the atmospheric boundary layer and its association with surface wind speed at a coastal site

Details Aerosols in the atmospheric boundary layer and its association with surface wind speed at a coastal site Aerosols in the atmospheric boundary layer and its association with surface wind speed at a coastal site

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60.1531v&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 16, p. 1531-1542.

Physics

4

Scientific paper

A significant component of aerosol particles in the atmospheric boundary layer is contributed by surface wind. A simple exponential function or a power-law is usually used to quantify this dependence. This is fairly valid over oceans where the background component is rather small. But over the coast, as a significant contribution to the background comes from the continent, which may not have the same wind speed dependence, it may be physically more meaningful to represent the aerosol system over the coast as the sum of two components, one being the background and the other contributed by sea breeze. The wind speed dependence of aerosol scattering coefficient in the atmospheric boundary layer at a tropical coastal station is studied in the light of the above hypothesis, using the data obtained from a bistatic continuous wave lidar. The observed aerosol scattering coefficient at a fixed altitude is represented as the sum of two components, one being the background and the other depending on the current wind speed having a power-law type wind dependence. The seasonal and altitude pattern of the two components are studied. It is seen that in this coastal site, during the monsoon season, on average, approximately 25% of the mixing region aerosol optical depth is contributed by the sea breeze. The seasonal pattern of the background component shows a marked difference within and above the well mixed region. A comparison of mixing region aerosol optical depth has shown that ~ 30% of the columnar aerosol optical depth comes from the lowest 1 km region of the atmosphere.

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