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

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Title:	Sources and radiative effects of wintertime black carbon aerosols in an urban atmosphere in east India
Authors:	彭祥;Verma, S.;Pani, S.K.;Bhanja, S.N.
Contributors:	地球科學學院大氣科學學系
Keywords:	Aerosol optical depth;Aerosols;Aerosols - analysis;Air Pollutants;Air Pollutants - analysis;Air Pollution;Air Pollution - statistics & numerical data;analysis;application parameters;Applied sciences;Atmosphere;Atmosphere - chemistry;Atmospheric pollution;biofuels;biomass;Black carbon;burning;carbon;carbon dioxide;chemistry;Cities;combustion;Combustion and energy production;diurnal variation;Emission sources;emissions;Environmental Monitoring;Exact sciences and technology;fossil fuels;gases;General Circulation Models;India;Pollution;Pollution sources. Measurement results;Radiative effects;Radiative forcing;Seasons;simulation models;Soot;Soot - analysis;statistics & numerical data;winter
Date:	2013-01-01
Issue Date:	2026-04-21 13:38:24 (UTC+8)
Publisher:	Elsevier Ltd.;Kidlington: Elsevier Ltd
Abstract:	摘要： ► BC surface mass concentration exhibited diurnal variation associated with local meteorology. ► Daytime mean BC surface mass concentration was 11μgm−3. ► Mean BC-AOD estimated in OPAC at 0.5μm was 0.11. ► Mean shortwave BC radiative forcing at the TOA was +0.94Wm−2. ► BC emissions from IGP and biofuel and fossil fuel combustion contributed majorly to BC loading. 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 (1100–1600h, Local Time, LT) hours. Daytime mean surface BC mass concentration and BC mass fraction in total aerosol (size range 0.23–20μm) and in submicronic aerosol (size range 0.23–1μm) during the study period, corresponding to the well-mixed atmospheric layer were 11μgm−3, 3–10%, and 9–16% respectively. The mean BC optical depth (BC-AOD) and BC-AOD fraction at 0.5μm 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 +0.94Wm−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 biofuel and fossil fuel combustion. Most of BC surface concentration (95%) and BC optical depth (60%) are contributed by emissions arising from the Indo-Gangetic plain (IGP) but there is a significant influence to BC columnar loading through elevated transport channels attributed mainly to emissions from open biomass burning from distant regions outside IGP. 其他題名： Chemosphere 出版者： Kidlington: Elsevier Ltd 出版日期： 2013-01 出處： Chemosphere (Oxford), 2013-01, Vol.90 (2), p.260-269 版權： 2012 Elsevier Ltd 版權： 2014 INIST-CNRS 版權： Copyright © 2012 Elsevier Ltd. All rights reserved. 識別號： ISSN: 0045-6535 識別號： ISSN: 1879-1298 識別號： EISSN: 1879-1298 識別號： DOI: 10.1016/j.chemosphere.2012.06.063 識別號： PMID: 22884284 識別號： CODEN: CMSHAF
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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