气候变化领域集成服务门户(CCPortal): Near-Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present-Day Characteristics of the Indian Summer Monsoon

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DOI	10.1029/2019JD031414
	Near-Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present-Day Characteristics of the Indian Summer Monsoon
	Das S.; Giorgi F.; Giuliani G.; Dey S.; Coppola E.
发表日期	2020
ISSN	2169897X
卷号	125 期号:4
英文摘要	Various air pollution mitigation scenarios have been proposed to improve the existing severe air quality problem over South Asia. Here we use a regional climate model to examine the response of the Indian summer monsoon (ISM) to two projected anthropogenic aerosol emission scenarios (a) short-lived climate pollutant “mitigation” scenario (2020–2030) and (b) current legislation “baseline” scenario (2005–2015). In the mitigation scenario, carbonaceous aerosol (black carbon and organic carbon) emissions are projected to decrease while sulfate emissions are projected to increase. This is expected to result in a marginal increase in anthropogenic aerosol optical depth over India (by 0.04–0.08). The dominating effect of scattering aerosols over absorbing aerosols in the mitigation scenario is expected to enhance atmospheric cooling over the Indian landmass, which in turn dampens the latitudinal thermal gradient and leads to a weakening of the ISM. This effect also reduces dust emissions over the Arabian Peninsula and transport across the Arabian Sea, decreasing the influence of the dust radiative feedback on the ISM. In addition, the increased amounts of sulfate and decreased amounts of carbonaceous aerosols are expected to result in drier conditions over the central parts of India. We also show that changes in emissions of different types of anthropogenic aerosols induce a chain of feedbacks, which can modulate the space-time variability of dust, thereby affecting the magnitude of dust radiative effects on the ISM dynamics. We conclude that it is critical from the policy point of view to implement strategies to cut the currently increasing sulfate emissions. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	anthropogenic aerosol emissions; dust; Indian summer monsoon; mitigation; regional climate modeling
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186160
作者单位	Earth System Physics Section, The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy; Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India; Centre of Excellence for Research on Clean Air, Indian Institute of Technology Delhi, New Delhi, India
推荐引用方式 GB/T 7714	Das S.,Giorgi F.,Giuliani G.,et al. Near-Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present-Day Characteristics of the Indian Summer Monsoon[J],2020,125(4).
APA	Das S.,Giorgi F.,Giuliani G.,Dey S.,&Coppola E..(2020).Near-Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present-Day Characteristics of the Indian Summer Monsoon.Journal of Geophysical Research: Atmospheres,125(4).
MLA	Das S.,et al."Near-Future Anthropogenic Aerosol Emission Scenarios and Their Direct Radiative Effects on the Present-Day Characteristics of the Indian Summer Monsoon".Journal of Geophysical Research: Atmospheres 125.4(2020).