Sources and radiative effects of wintertime black carbon aerosols in an urban atmosphere in east India

Chemosphere
S VermaS N Bhanja

Abstract

We carried out an analysis of black carbon (BC) surface mass concentration, its radiative effects, and sources of origin in an urban atmosphere in east India, during winter season, through ground-based measurements and application of modelling tools. BC surface mass concentration exhibited diurnal variation with their higher values and a larger variability during evening to early morning hours than during daytime (1100-1600 h, Local Time, LT) hours. Daytime mean surface BC mass concentration and BC mass fraction in total aerosol (size range 0.23-20 μm) and in submicronic aerosol (size range 0.23-1 μm) during the study period, corresponding to the well-mixed atmospheric layer were 11 μg m(-3), 3-10%, and 9-16% respectively. The mean BC optical depth (BC-AOD) and BC-AOD fraction at 0.5 μm were estimated in an optical model as 0.11 and 13% respectively. Mean shortwave aerosol radiative forcing due to BC at top-of-atmosphere (TOA) during the study period was found to be +0.94 Wm(-2), which is about 59% the global mean radiative forcing due to carbon-dioxide gases. Estimates from BC simulations in a general circulation model showed BC surface concentration and BC optical depth in east India are primarily attributed to emissions from...Continue Reading

References

Sep 28, 2002·Science·Surabi MenonYunfeng Luo
Nov 2, 2007·Journal of the Air & Waste Management Association·Aki VirkkulaIsmo K Koponen

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Citations

Feb 8, 2014·Analytical Chemistry·Susan D Richardson, Thomas A Ternes
May 29, 2018·Environmental Science and Pollution Research International·Babu PriyadharshiniBrent N Holben
Mar 31, 2018·The Science of the Total Environment·Shantanu Kumar PaniSerm Janjai
Jun 17, 2020·The Science of the Total Environment·Shantanu Kumar PaniSaginela RavindraBabu

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