气候变化领域集成服务门户(CCPortal): Sensitivity of Carbonaceous Aerosol Properties to the Implementation of a Dynamic Aging Parameterization in the Regional Climate Model RegCM

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DOI	10.1029/2020JD033613
	Sensitivity of Carbonaceous Aerosol Properties to the Implementation of a Dynamic Aging Parameterization in the Regional Climate Model RegCM
	Ghosh S.; Riemer N.; Giuliani G.; Giorgi F.; Ganguly D.; Dey S.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:17
英文摘要	Freshly emitted soot is hydrophobic, but condensation of secondary aerosols and coagulation with other particles modify its hygroscopic optical properties. This conversion is referred to as “aerosol aging.” Many climate models represent this aging process with a fixed aging time scale, whereas in reality, it is a dynamic process that depends on environmental conditions. Here, we implement a dynamic aging parameterization scheme in the regional climate model RegCM4 in place of the fixed aging timescale of 1.15 days (∼27.6 h) and examine its impact on the aerosol life cycle over the Indian subcontinent. The conversion from hydrophobic to hydrophilic aerosol is usually lower than 27.6 h over the entire landmass and lower than 10 h over the polluted Indo-Gangetic Basin (IGB), with seasonal variability. Due to the implementation of the dynamic aging scheme, the column burden and surface mass concentration of carbonaceous aerosols increase during the drier season (December–February) when washout is negligible. The burden is reduced during the wet season (June–September) due to a more efficient washout except over the IGB, where a reduction in precipitation as a result of radiative feedbacks increases the aerosol concentrations. Over the polluted IGB, surface dimming increases due to the dynamic aging scheme, with the top of the atmosphere forcing remaining mostly unchanged. As a result, atmospheric heating increases by at least 1.2 W/m2. Our results suggest that climate models should incorporate dynamic aging for a more realistic representation of aerosol simulations, especially in highly polluted regions. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	black carbon; climate; dynamic aging; feedback; India; regional climate model
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/237018
作者单位	Center for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India; Department of Atmospheric Sciences, University of Illinois Urbana-Champaign, Urbana, IL, United States; Earth System Physics Section, The Abdus Salam International Centre for Theoretical Physics, Trieste, Italy
推荐引用方式 GB/T 7714	Ghosh S.,Riemer N.,Giuliani G.,et al. Sensitivity of Carbonaceous Aerosol Properties to the Implementation of a Dynamic Aging Parameterization in the Regional Climate Model RegCM[J],2021,126(17).
APA	Ghosh S.,Riemer N.,Giuliani G.,Giorgi F.,Ganguly D.,&Dey S..(2021).Sensitivity of Carbonaceous Aerosol Properties to the Implementation of a Dynamic Aging Parameterization in the Regional Climate Model RegCM.Journal of Geophysical Research: Atmospheres,126(17).
MLA	Ghosh S.,et al."Sensitivity of Carbonaceous Aerosol Properties to the Implementation of a Dynamic Aging Parameterization in the Regional Climate Model RegCM".Journal of Geophysical Research: Atmospheres 126.17(2021).