Abstract
Columnaraerosol size distributions, retrieved from spectral AOD (aerosol optical depth) esti mates over a northeastern location of India (Dibrugarh) are, ingeneral, bimodal with the occurrence of primary (broad) mode at 0.04 - 0.17 m and the secondary mode at 0.88 - 1.29 m. The physical parameters of size distributions representing the microphysical properties of aerosols show distinct sea sonal variations with the highest value of the effec tiveradii (~ 0.55 m) during pre-mon soon (March to May) season which, along with the highest value of AOD (~ 0.46 ± 0.09) during the same season, is attributed to the maxi mum abundance of coarsepa ticles. Examining the re sults in the light of the HYSPLIT back tra jectory analy sis and the peruliar to pogr phy of northeast India allowing advection only from the Indo-Gangetic plains or Bay-of-Ben gal, it appears that the strong presence of the coarse mode aerosols are associated with either mineral dust or marine aerosol components or both.
Highlights
Information on the distribution of atmospheric aerosol is important for the understanding of physical processes relating to studies of weather, climate, atmospheric electricity, air pollution, and aerosol physics
Because of their capacity to directly alter the rate of transfer of solar radiation and indirectly affect the complex phenomena connected with cloud and precipitation processes, aerosols are of considerable interest to atmospheric scientists
As tpl is a measure of the columnar aerosol content, we have considered three height levels keeping in mind the elevated topography of the northeastern region over the observation site: 1000 m, 2000 m and 3500 m above ground level (AGL)
Summary
Information on the distribution of atmospheric aerosol is important for the understanding of physical processes relating to studies of weather, climate, atmospheric electricity, air pollution, and aerosol physics. Because of their capacity to directly alter the rate of transfer of solar radiation and indirectly affect the complex phenomena connected with cloud and precipitation processes, aerosols are of considerable interest to atmospheric scientists. We report the characteristics of aerosol size distribution retrieved from spectral AOD estimates over Dibrugarh and investigate the effect of meteorological factors, especially rain and wind, as well as synoptic-scale phenomena on aerosol particle number concentrations and size distributions
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