globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-016-3338-6
Scopus记录号: 2-s2.0-84986300425
论文题名:
Effects of cumulus parameterization closures on simulations of summer precipitation over the continental United States
作者: Qiao F.; Liang X.-Z.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期:2017-01-02
起始页码: 225
结束页码: 247
语种: 英语
英文关键词: Closure assumption ; Ensemble cumulus parameterization ; Heavy rainfall frequency ; Precipitation diurnal variation
英文摘要: This study examines the effects of five cumulus closure assumptions on simulations of summer precipitation in the continental U.S. by utilizing an ensemble cumulus parameterization (ECP) that incorporates multiple alternate closure schemes into a single cloud model formulation. Results demonstrate that closure algorithms significantly affect the summer mean, daily frequency and intensity, and diurnal variation of precipitation, with strong regional dependence. Overall, the vertical velocity (W) closure produces the smallest summer mean biases, while the moisture convergence (MC) closure most realistically reproduces daily variability. Both closures have advantages over others in simulating U.S. daily rainfall frequency distribution, though both slightly overestimate intense rain events. The MC closure is superior at capturing summer rainfall amount, daily variability, and heavy rainfall frequency over the Central U.S., but systematically produces wet biases over the North American Monsoon (NAM) region and Southeast U.S., which can be reduced by using the W closure. The instability tendency (TD) and the total instability adjustment (KF) closures are better at capturing observed diurnal signals over the Central U.S. and the NAM, respectively. The results reasonably explain the systematic behaviors of several major cumulus parameterizations. A preliminary experiment combining two optimal closures (averaged moisture convergence and vertical velocity) in the ECP scheme significantly reduced the wet (dry) biases over the Southeast U.S. in the summer of 1993 (2003), and greatly improved daily rainfall correlations over the NAM. Further improved model simulation skills may be achieved in the future if optimal closures and their appropriate weights can be derived at different time scales based on specific climate regimes. © 2016, Springer-Verlag Berlin Heidelberg.
资助项目: STCSM, Science and Technology Commission of Shanghai Municipality ; STCSM, Science and Technology Commission of Shanghai Municipality ; China Postdoctoral Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53160
Appears in Collections:过去全球变化的重建

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作者单位: Key Laboratory of Geographic Information Science, Ministry of Education, East China Normal University, Shanghai, China; Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Champaign, IL, United States; Earth System Science Interdisciplinary Center, University of Maryland, 5825 University Research Court, Suite 4001, College Park, MD, United States; Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, United States

Recommended Citation:
Qiao F.,Liang X.-Z.. Effects of cumulus parameterization closures on simulations of summer precipitation over the continental United States[J]. Climate Dynamics,2017-01-01,49(2017-01-02)
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