Sensitivity study of cloud parameterizations with relative dispersion in CAM5.1: impacts on aerosol indirect effects

doi:10.5194/acp-17-5877-2017

	Sensitivity study of cloud parameterizations with relative dispersion in CAM5.1: impacts on aerosol indirect effects
	Xie, Xiaoning 6; Zhang, He 5; Liu, Xiaodong 4,6; Peng, Yiran 2,3; Liu, Yangang 1
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2017-05-12
卷号	17 期号:9 页码:5877-5892
DOI	10.5194/acp-17-5877-2017
文献子类	Article
英文摘要	Aerosol-induced increase of relative dispersion of cloud droplet size distribution epsilon exerts a warming effect and partly offsets the cooling of aerosol indirect radiative forcing (AIF) associated with increased droplet concentration by increasing the cloud droplet effective radius (R-e) and enhancing the cloud-to-rain autoconversion rate (Au) (labeled as the dispersion effect), which can help reconcile global climate models (GCMs) with the satellite observations. However, the total dispersion effects on both R-e and Au are not fully considered in most GCMs, especially in different versions of the Community Atmospheric Model (CAM). In order to accurately evaluate the dispersion effect on AIF, the new complete cloud parameterizations of R-e and Au explicitly accounting for epsilon are implemented into the CAM version 5.1 (CAM5.1), and a suite of sensitivity experiments is conducted with different representations of epsilon reported in the literature. It is shown that the shortwave cloud radiative forcing is much better simulated with the new cloud parameterizations as compared to the standard scheme in CAM5.1, whereas the influences on longwave cloud radiative forcing and surface precipitation are minimal. Additionally, consideration of the dispersion effect can significantly reduce the changes induced by anthropogenic aerosols in the cloud-top effective radius and the liquid water path, especially in the Northern Hemisphere. The corresponding AIF with the dispersion effect considered can also be reduced substantially by a range of 0.10 to 0.21W m(-2) at the global scale and by a much bigger margin of 0.25 to 0.39W m(-2) for the Northern Hemisphere in comparison with that of fixed relative dispersion, mainly dependent on the change of relative dispersion and droplet concentrations (Delta epsilon/Delta N-c).
WOS关键词	DROPLET SPECTRAL DISPERSION ; COMMUNITY ATMOSPHERE MODEL ; EFFECTIVE RADIUS ; AUTOCONVERSION PROCESS ; STRATOCUMULUS CLOUDS ; BULK MICROPHYSICS ; PART II ; CLIMATE ; REPRESENTATION ; FRAMEWORK
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
WOS记录号	WOS:000401332000003
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5479]
专题	地球环境研究所_古环境研究室
作者单位	1.Brookhaven Natl Lab, Environm & Climate Sci Dept, Upton, NY 11973 USA 2.Tsinghua Univ, Joint Ctr Global Change Studies, Beijing 100084, Peoples R China 3.Tsinghua Univ, Minist Educ, Key Lab Earth Syst Modeling, Ctr Earth Syst Sci, Beijing 100084, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Inst Atmospher Phys, Int Ctr Climate & Environm Sci, Beijing 100029, Peoples R China 6.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Xie, Xiaoning,Zhang, He,Liu, Xiaodong,et al. Sensitivity study of cloud parameterizations with relative dispersion in CAM5.1: impacts on aerosol indirect effects[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(9):5877-5892.
APA	Xie, Xiaoning,Zhang, He,Liu, Xiaodong,Peng, Yiran,&Liu, Yangang.(2017).Sensitivity study of cloud parameterizations with relative dispersion in CAM5.1: impacts on aerosol indirect effects.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(9),5877-5892.
MLA	Xie, Xiaoning,et al."Sensitivity study of cloud parameterizations with relative dispersion in CAM5.1: impacts on aerosol indirect effects".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.9(2017):5877-5892.