DOI: 10.1002/2017MS001191
Scopus记录号: 2-s2.0-85044291252
论文题名: The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes
作者: Song X ; , Zhang G ; J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
卷: 10, 期: 3 起始页码: 842
结束页码: 866
语种: 英语
英文关键词: Climate models
; Parameterization
; Surface waters
; Atmospheric model simulations
; Atmospheric process
; Cloud modeling
; Convection parameterization
; Double ITCZ
; Impact of changes
; Intertropical convergence zone
; Sea surface temperature (SST)
; Oceanography
英文摘要: Several improvements are implemented in the Zhang-McFarlane (ZM) convection scheme to investigate the roles of convection parameterization in the formation of double intertropical convergence zone (ITCZ) bias in the NCAR CESM1.2.1. It is shown that the prominent double ITCZ biases of precipitation, sea surface temperature (SST), and wind stress in the standard CESM1.2.1 are largely eliminated in all seasons with the use of these improvements in convection scheme. This study for the first time demonstrates that the modifications of convection scheme can eliminate the double ITCZ biases in all seasons, including boreal winter and spring. Further analysis shows that the elimination of the double ITCZ bias is achieved not by improving other possible contributors, such as stratus cloud bias off the west coast of South America and cloud/radiation biases over the Southern Ocean, but by modifying the convection scheme itself. This study demonstrates that convection scheme is the primary contributor to the double ITCZ bias in the CESM1.2.1, and provides a possible solution to the long-standing double ITCZ problem. The atmospheric model simulations forced by observed SST show that the original ZM convection scheme tends to produce double ITCZ bias in high SST scenario, while the modified convection scheme does not. The impact of changes in each core component of convection scheme on the double ITCZ bias in atmospheric model is identified and further investigated. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75630
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States
Recommended Citation:
Song X,, Zhang G,J. The Roles of Convection Parameterization in the Formation of Double ITCZ Syndrome in the NCAR CESM: I. Atmospheric Processes[J]. Journal of Advances in Modeling Earth Systems,2018-01-01,10(3)