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Long-Term Observation of Black Carbon and Its Relationship with Aerosol Radiative Forcing over South Asia

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Long-Term Observation of Black Carbon and Its Relationship with Aerosol Radiative Forcing over South Asia
Black carbon(BC)is one of the major aerosol components with relatively high implications on climatic patterns through its radiative forcing(RF).South Asia has recently experienced an increased concentration of pollution;however,relatively fewer studies have been carried out on long-term assessment of BC and its implications.The present study analyzed the long-term concentration of BC in selected urban locations over South Asia using the Mod-em-Era Retrospective analysis for Research and Applications,version 2(MERRA-2).The study employed statistical analysis,including linear regression techniques,to assess the long-term concentration of BC.The results show that a rapid increase of BC is observed over most urban locations of South Asia with the predominance in winter and hence requires strict regional control measures to reduce the excess concentration of BC in the atmosphere.High concentra-tion of BC in winter is attributed to anthropogenic activities and changes in meteorological conditions that enhance the accumulation of pollutants in the atmosphere.The relationship of BC with cloud top temperature and cloud ef-fective radius demonstrates the direct and indirect effect of BC on cloud properties in this region.The RF results re-veal that aerosol optical depth has positive aerosol RF in the atmosphere and negative RF at the top of the atmo-sphere(TOA)as well as at the bottom of the atmosphere(BOA).Negative RF at the TOA indicates less forcing effi-ciency due to fewer BC aerosols.On the other hand,averaging aerosol RF within the atmosphere reveals positive for-cing,which suggests the efficiency force exerted by BC aerosols after absorbing solar radiation.

black carbonlong-term trendsradiative forcingurban locationsSouth Asia

Nimashi P.M.CHATHURANGIKA、Mozammel HAQUE、Matthews NYASULU、Rehana KHAN、Farhan AHMED、Mosammat J.Fardus JUI、Rokaiya FALGUNI、Mohammad Lokman HOSSAIN、Abul Kalam M.Lutfor RAHMAN

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Atmospheric Environment Center,Joint Laboratory for International Cooperation on Climate and Environmental Change,Ministry of Education,Nanjing University of Information Science & Technology,Nanjing 210044,China

Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science & Technology,Nanjing 210044,China

School of Ecology and Applied Meteorology,Nanjing Univers

School of Ecology and Applied Meteorology,Nanjing University of Information Science & Technology,Nanjing 210044,China

Department of Physics,Higher Education,Government of Khyber Pakhtunkhwa Peshawar,2500,Pakistan

Department of Chemistry,Jagannath University,Dhaka 1100,Bangladesh

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black carbon long-term trends radiative forcing urban locations South Asia

2024

10.1007/s13351-024-4046-5

气象学报(英文版)
中国气象学会

气象学报(英文版)

CSTPCD
影响因子：0.57
ISSN：0894-0525
年,卷(期)：2024.38(6)