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Evidence of surface cooling from absorbing aerosols

Krishnan, R and Ramanathan, V (2002) Evidence of surface cooling from absorbing aerosols. Geophysical Research Letters, 29 (9). pp. 54-1.

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Abstract

Anthropogenic emissions over the Asian region have grown rapidly with increase in population and industrialization. Air-pollutants from this region lead to a brownish haze over most of the North Indian Ocean and South Asia during winter and spring. The haze, with as much as 10-15 of black carbon (by mass), is known to reduce the surface solar insolation by about 10 (-15 Wm -2) and nearly double the lower atmospheric solar heating. Here we present an analysis of observed surface-temperature variations over the Indian subcontinent, which filters out effects of greenhouse gases and natural variability. The analysis reveals that the absorbing aerosols have led to a statistically significant cooling of about 0.3°C since the 1970s. The seasonally asymmetric cooling, which is consistent with the seasonality of the South Asian aerosol forcing, raises the new possibility that the surface cooling underneath the polluted regions, is balanced by warming elsewhere.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union
Uncontrolled Keywords: Cooling; Global warming; Greenhouse effect; Industrial emissions; Solar heating, Anthropogenic emissions; Solar insolation, Aerosols, aerosol; atmospheric pollution; smog; surface temperature, Asia; Indian Ocean
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 24 Apr 2015 14:32
Last Modified: 24 Apr 2015 14:32
URI: http://moeseprints.incois.gov.in/id/eprint/1539

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