Aerosol radiative forcing due to enhanced black carbon at an urban site in India

Details Aerosol radiative forcing due to enhanced black carbon at an urban site in India Aerosol radiative forcing due to enhanced black carbon at an urban site in India

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29r..27b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 18, pp. 27-1, CiteID 1880, DOI 10.1029/2002GL015826

Physics

Geophysics

48

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Global Change: Atmosphere (0315, 0325), History Of Geophysics: Atmospheric Sciences, Hydrology: Anthropogenic Effects

Scientific paper

During a comprehensive aerosol field campaign, simultaneous measurements were made of aerosol spectral optical depths, black carbon mass concentration (Mb), total (Mt) and size segregated aerosol mass concentrations over an urban continental location, Bangalore (13° N, 77°E, 960 m msl), in India. Large amounts of BC were observed; both in absolute terms and fraction of total mass (~11%) and sub-micron mass (~23%) implying a significantly low single scatter albedo. The aerosol visible optical depth (τp) was in the range 0.24 to 0.45. Estimated surface forcing is as high as -23 W m-2 and top of the atmosphere (TOA) forcing is +5 W m-2 during relatively cleaner periods (τp ~ 0.24). The net atmospheric absorption translates to an atmospheric heating of ~0.8 K day-1 for cleaner periods and ~1.5 K day-1 for less cleaner periods (τp ~ 0.45). Our observations raise several issues, which may have impacts to regional climate and monsoon.

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