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Field measurements of sub-micron aerosol concentration during cold season in India

Chate, DM and Pranesha, TS (2004) Field measurements of sub-micron aerosol concentration during cold season in India. Current Science, 86 (12). pp. 1610-1613.

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Sub-micron particle size distribution and temperature were measured at six levels immediately above the ground surface during 8-16 December 1997 and 24-28 December 1998. Diurnal observations were made at every three-hour interval at all the levels. Continuous measurements of aerosol concentration were made from 0300 to 1000 h at 1 m level. During this period, particle concentration decreases from 0300 h, attains a minimum value between 0600 and 0700 h, and then maximum at 0900 h. Particles 0.075 m show systematic variation in concentration, whereas particles < 0.075 m show large fluctuations with time during 0300 to 1000 h. Concentration of particles of sizes 0.075-0.75 m shows a minimum at 15-cm level where the temperature is maximum. However, particles of size 0.013 m undergo Brownian diffusion and thus do not show any trend with temperature. The phenomena of thermophoresis and fog scavenging are discussed in terms of these results.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Science
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 18 Apr 2015 09:29
Last Modified: 18 Apr 2015 09:29

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