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Seasonal characteristics of black carbon aerosols over a high altitude station in Southwest India

Raju, MP and Safai, PD and Rao, PSP and Devara, PCS and Budhavant, KB (2011) Seasonal characteristics of black carbon aerosols over a high altitude station in Southwest India. Atmospheric Research, 100 (1). pp. 103-110.

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Abstract

Black carbon (BC) aerosol mass concentrations were measured using an Aethalometer at high altitude station Sinhagad, a rural location in south-west India, in the pre-monsoon and post-monsoon seasons during 2009-10. Mean BC concentration was about 67 less during pre-monsoon than that during post-monsoon. During post-monsoon, the surface boundary layer is generally shallow resulting in the trapping of pollutants in a lesser volume near the surface which lead to higher BC concentrations than of pre-monsoon which experiences high convective activity and thereby dispersion of aerosols near the surface. Diurnal variation of BC during pre-monsoon was attributed to the changes in the local boundary layer as well as to the certain anthropogenic activities near the sampling site. BC aerosol mass concentration showed good correlation with temperature gradient and relative humidity in pre-monsoon. However in post-monsoon, a weak correlation was observed with temperature gradient whereas with relative humidity, a good correlation was observed during night hours only. The wind speed and direction using NCEP/NCAR reanalysis data showed a possible transport from Pune city as well as from N/NE Indian regions during post-monsoon. BC also showed good correlation with other anthropogenic components of aerosols like NssSO 4, NssK, NO 3, and NH 4; indicating a possible common source for them.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Black carbon; High altitude; Meteorological parameters; Seasonal variation; Secondary aerosols, Air pollution; Atmospheric aerosols; Atmospheric humidity; Atmospheric thermodynamics; Atmospherics; Boundary layers; Concentration (process); Fog; Thermal gradients; Wind effects, Atmospheric movements, aerosol; atmospheric transport; black carbon; boundary layer; concentration (composition); diurnal variation; monsoon; relative humidity; seasonal variation; temperature gradient; wind velocity, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 27 Oct 2014 10:46
Last Modified: 27 Oct 2014 10:46
URI: http://moeseprints.incois.gov.in/id/eprint/652

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