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Source identification and global implications of black carbon

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Black carbon (BC) is one of the short-lived air pollutants that contributes significantly to aerosol radiative forcing and global climate change.It is emitted by the incomplete combustion of fossil fuels,biofuels,and biomass.Urban environments are quite complex and thus,the use of mobile jointly with fixed monitoring provides a better un-derstanding of the dynamics of BC distribution in such areas.The present study addresses the measurement of BC concentration using real-time mobile and ambient monitoring in Barranquilla,an industrialized urban area of the Colombian Caribbean.A microaethalometer (MA200) and an aethalometer (AE33) were used for measuring the BC concentration.The absorption (A)ngstr(o)m exponent (AAE) values were determined for the study area,for iden-tifying the BC emission sources.The results of the ambient sampling show that vehicle traffic emissions prevail;however,the influence of biomass burning was also observed.The mean ambient BC concentration was found to be 1.04±1.03 μg/m3 and varied between 0.5 and 4.0 μg/m3.From the mobile measurements obtained in real traf-fic conditions on the road,a much higher average value of 16.1 ± 16.5 μg/m3 was measured.Many parts of the city showed BC concentrations higher than 20 μg/m3.The spatial distribution of BC concentration shows that ve-hicle emissions and traffic jams,a consequence of road and transport infrastructure,are the factors that most af-fect the BC concentration.A comparison of results obtained from two aethalometers indicates that the concentrations measured by MA200 are 9％ lower than those measured by AE33.The AAE obtained was found to vary between 1.1 and 1.6,indicating vehicular emissions as the most crucial source.In addition,it was ob-served that the BC concentration on working days was 2.5 times higher than on the weekends in the case of mo-bile monitoring and 1.5 times higher in the case of ambient monitoring.

Air pollutionBlack carbonSpatial distributionSource apportionmentAbsorption (A)ngstr(o)m exponent

Erika P.Blanco-Donado、Ismael L.Schneider、Paulo Artaxo、Jesus Lozano-Osorio、Luana Portz、Marcos L.S.Oliveira

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Department of Civil and Environmental,Universidad de la Costa,CUC,Barranquilla,080002,Colombia

Department of Applied Physics,Institute of Physics,University of S(a)o Paulo,SP 05508-220,Brazil

Universidad de Lima,Avenida Javier Prado Este 4600,Santiago de Surco 1503,Peru

Department of Civil and Envi-ronmental of the Universidad de la Costathe Center for Environmental Technology Research CentroEnvironmental Management and Sustainabil-ity Research Group Grupo de Investigación de Gestión y Sostenibilidad Ambiental-GESColciencias,ColombiaColciencias,Colombia

Project 141180764164Contract 815-2018

2022

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSTPCDCSCDSCI
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2022.13(1)
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