Open Access Digital Repository of Ministry of Earth Sciences, Government of India

Contribution of anthropogenic aerosols in direct radiative forcing and atmospheric heating rate over Delhi in the Indo-Gangetic Basin

Srivastava, AK and Singh, S and Tiwari, S and Bisht, DS (2012) Contribution of anthropogenic aerosols in direct radiative forcing and atmospheric heating rate over Delhi in the Indo-Gangetic Basin. Environmental Science and Pollution Research, 19 (4). pp. 1144-1158.

Full text not available from this repository. (Request a copy)

Abstract

Introduction: The present work is aimed to understand direct radiation effects due to aerosols over Delhi in the Indo-Gangetic Basin (IGB) region, using detailed chemical analysis of surface measured aerosols during the year 2007. Methods: An optically equivalent aerosol model was formulated on the basis of measured aerosol chemical compositions along with the ambient meteorological parameters to derive radiatively important aerosol optical parameters. The derived aerosol parameters were then used to estimate the aerosol direct radiative forcing at the top of the atmosphere, surface, and in the atmospherez. Results: The anthropogenic components measured at Delhi were found to be contributing ~72 to the composite aerosol optical depth (AOD0.5 ~0.84). The estimated mean surface and atmospheric forcing for composite aerosols over Delhi were found to be about -69, -85, and -78 W m-2 and about +78, +98, and +79 W m-2 during the winter, summer, and post-monsoon periods, respectively. The anthropogenic aerosols contribute ~90, 53, and 84 to the total aerosol surface forcing and ~93, 54, and 88 to the total aerosol atmospheric forcing during the above respective periods. The mean (±SD) surface and atmospheric forcing for composite aerosols was about -79 (±15) and +87 (±26) W m-2 over Delhi with respective anthropogenic contributions of ~71 and 75 during the overall period of observation. Conclusions: Aerosol induced large surface cooling, which was relatively higher during summer as compared to the winter suggesting an increase in dust loading over the station. The total atmospheric heating rate at Delhi averaged during the observation was found to be 2.42 ± 0.72 K day-1, of which the anthropogenic fraction contributed as much as ~73.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer.
Uncontrolled Keywords: aerosol composition; anthropogenic effect; anthropogenic source; atmospheric forcing; fractionation; heating; optical depth; radiative forcing, aerosol; air pollutant; article; atmosphere; chemical model; chemistry; city; climate; environmental monitoring; heating; India; season; solar energy, Aerosols; Air Pollutants; Atmosphere; Cities; Climate; Environmental Monitoring; Heating; India; Models, Chemical; Seasons; Solar Energy, Delhi; Gangetic Plain; India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 23 Dec 2013 04:13
Last Modified: 23 Dec 2013 04:13
URI: http://moeseprints.incois.gov.in/id/eprint/504

Actions (login required)

View Item View Item