气候变化领域集成服务门户(CCPortal): An Improved Representation of Aerosol Wet Removal by Deep Convection and Impacts on Simulated Aerosol Vertical Profiles

CCPortal

DOI	10.1029/2020JD034173
	An Improved Representation of Aerosol Wet Removal by Deep Convection and Impacts on Simulated Aerosol Vertical Profiles
	Shan Y.; Liu X.; Lin L.; Ke Z.; Lu Z.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:13
英文摘要	We introduce a physics-based aerosol wet removal scheme with unified treatments of aerosol transport and removal by convective clouds into the Community Atmosphere Model version 6. Since several important physical processes are still neglected or poorly represented in this new physics-based scheme, we develop secondary improvements to the parameterizations of aerosol activation, resuspension, and cloud-borne aerosol detrainment in this new scheme. Changes in the aerosol wet removal scheme cause tropospheric aerosol concentrations to decrease to different extents: compared to the control run, the physics-based scheme significantly decreases aerosol burdens by up to 60% over the southern Pacific Ocean, whereas the secondary improvements mitigate the decreasing tendency. The burden changes also depend on aerosol chemical components: the sulfate mass decrease is compensated by secondary production, black carbon (BC) is effectively removed via increasing the hygroscopicity of particulate organic matter from 0 to 0.2, and dust shows the most spatially heterogeneous changes. Simulated aerosol profiles are evaluated against aircraft-based observations over the Pacific and Atlantic Oceans. The secondary-improved scheme reduces the overestimations of upper tropospheric BC and sea salt concentrations by a factor of 10 and 1,000, respectively, and reproduces the dependence of BC mass decrease rates on cloud types. Consideration of convective cloud-borne aerosol detrainment plays the most important role in enhancing the aerosol wet removal and decreasing the positive biases of tropospheric BC and sea salt concentrations. We also summarize unresolved issues related to convective cloud genesis and microphysics, cloud-borne aerosol evolution, and BC and dust emissions. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol; cloud microphysics parameterization; deep convection; wet removal
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/237160
作者单位	Department of Atmospheric Science, University of Wyoming, Laramie, WY, United States; Now at Brookhaven National Laboratory, Upton, NY, United States; Department of Atmospheric Sciences, Texas A&M University, College Station, TX, United States
推荐引用方式 GB/T 7714	Shan Y.,Liu X.,Lin L.,et al. An Improved Representation of Aerosol Wet Removal by Deep Convection and Impacts on Simulated Aerosol Vertical Profiles[J],2021,126(13).
APA	Shan Y.,Liu X.,Lin L.,Ke Z.,&Lu Z..(2021).An Improved Representation of Aerosol Wet Removal by Deep Convection and Impacts on Simulated Aerosol Vertical Profiles.Journal of Geophysical Research: Atmospheres,126(13).
MLA	Shan Y.,et al."An Improved Representation of Aerosol Wet Removal by Deep Convection and Impacts on Simulated Aerosol Vertical Profiles".Journal of Geophysical Research: Atmospheres 126.13(2021).