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Atmospheric aerosol formation and its growth during the cold season in India

Chate, DM and Murugavel, P (2010) Atmospheric aerosol formation and its growth during the cold season in India. Journal of Earth System Science, 119 (4). pp. 471-477.

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The effects of molecular diffusivity of H2SO4 and NH3 vapours on nucleated particles of SO2-4 and NO-3 species are reported. Condensation sink and source rate of H2SO4 and NH3 vapours, growth rates and ratios of real to apparent nucleation rates are calculated for SO2-4 and NO2-3 aerosols using fractional contributions of them in total aerosol size-distribution during the measurement period at Pune, reported in Chate and Pranesha (2004). The percentage of nucleated SO2-4and NO-3 aerosols of mid-point diameter 13 nm are 2 and 3 respectively of the total particles (13 nm Dp750 nm) for both H2SO4 and NH3 diffusion. In the diameter range 75 nm Dp 133 nm, it is 48 and 45 of SO2-4 and NO-3 aerosols, respectively for NH3 diffusion and 43 and 36 of SO2-4and NO-3 for H2SO4 diffusion. Increase in percentage of nucleated particles of these species corresponding to mid-point diameter 133 nm around 0900 h IST is significantly higher than that of mid-point diameter 13 nm and it is due to photo-chemical nucleation, coagulation and coalescence among nucleated clusters. The ratios of real to apparent formation rates for SO2-4 and NO-3 aerosols are 12 and 11 respectively, corresponding to mid-point diameter 13 nm, 17 and 13, for midpoint diameter 133 nm and 12 and 9.5, for mid-point diameter 750 nm. The results indicate that nucleation involving H2SO4 and acidic NH3 diffusion on SO2-4and NO-3 particles is the most relevant mechanism in this region.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian academy of Science
Uncontrolled Keywords: aerosol; atmospheric chemistry; coagulation; condensation; diffusivity; nucleation; photochemistry, India
Subjects: Earth Resources and Remote Sensing
Meteorology and Climatology
Oceanography > air-sea interactions
Depositing User: IITM Library
Date Deposited: 22 May 2015 11:22
Last Modified: 22 May 2015 11:22

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