DOI: 10.1175/JCLI-D-18-0027.1
Scopus记录号: 2-s2.0-85048463234
论文题名: Improving the simulation of tropical convective cloud-top heights in CAM5 with CloudSat observations
作者: Wang M. ; Zhang G.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 13 起始页码: 5189
结束页码: 5204
语种: 英语
英文关键词: Climate models
; Clouds
; Convective parameterization
Scopus关键词: Atmospheric radiation
; Climate models
; Clouds
; Tropics
; Wind effects
; Cloud radiative forcing
; Community atmosphere model
; Convective clouds
; Convective parameterization
; Convective precipitation
; Environmental conditions
; Model atmosphere
; Model simulation
; Precipitation (meteorology)
; climate modeling
; cloud radiative forcing
; CloudSat
; convective cloud
; entrainment
; environmental conditions
; parameterization
; precipitation (climatology)
; Africa
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (West)
英文摘要: Using 4 years of CloudSat data, the simulation of tropical convective cloud-top heights (CCTH) above 6 km simulated by the convection scheme in the Community Atmosphere Model, version 5 (CAM5), is evaluated. Compared to CloudSat observations, CAM5 underestimates CCTH by more than 2 km on average. Further analysis of model results suggests that the dilute CAPE calculation, which has been incorporated into the convective parameterization since CAM4, is a main factor restricting CCTH to much lower levels. After removing this restriction, more convective clouds develop into higher altitudes, although convective clouds with tops above 12 km are still underestimated significantly. The environmental conditions under which convection develops in CAM5 are compared with CloudSat observations for convection with similar CCTHs. It is shown that the model atmosphere is much more unstable compared to CloudSat observations, and there is too much entrainment in CAM5. Since CCTHs are closely associated with cloud radiative forcing, the impacts of CCTH on model simulation are further investigated. Results show that the change of CCTH has important impacts on cloud radiative forcing and precipitation. With increased CCTHs, there is more cloud radiative forcing in tropical Africa and the eastern Pacific, but less cloud radiative forcing in the western Pacific. The contribution to total convective precipitation from convection with cloud tops above 9 km is also increased substantially. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111464
Appears in Collections: 气候减缓与适应
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作者单位: Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China; Joint Center for Global Change Studies, Beijing, China; Scripps Institution of Oceanography, La Jolla, CA, United States; Department of Earth System Science, Tsinghua University, Beijing, China
Recommended Citation:
Wang M.,Zhang G.J.. Improving the simulation of tropical convective cloud-top heights in CAM5 with CloudSat observations[J]. Journal of Climate,2018-01-01,31(13)