DOI: 10.1029/2012JD018213
论文题名: Uncertainty quantification and parameter tuning in the cam5 zhang-mcfarlane convection scheme and impact of improved convection on the global circulation and climate
作者: Yang B. ; Qian Y. ; Lin G. ; Leung L.R. ; Rasch P.J. ; Zhang G.J. ; Mcfarlane S.A. ; Zhao C. ; Zhang Y. ; Wang H. ; Wang M. ; Liu X.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 2 起始页码: 395
结束页码: 415
语种: 英语
Scopus关键词: Energy utilization
; Importance sampling
; Natural convection
; Optimization
; Uncertainty analysis
; Atmospheric convergence
; Community atmosphere model
; Convective available potential energies
; Convective precipitation
; Intertropical convergence zone
; Stratiform precipitation
; Tropical rainfall measuring missions
; Uncertainty quantifications
; Rain
; climate change
; convection
; parameterization
; potential energy
; precipitation (climatology)
; stochasticity
; uncertainty analysis
英文摘要: 1] In this study, we applied an uncertainty quantification (UQ) technique to improve convective precipitation in the global climate model, the Community Atmosphere Model version 5 (CAM5), in which the convective and stratiform precipitation partitioning is very different from observational estimates. We examined the sensitivity of precipitation and circulation to several key parameters in the Zhang-McFarlane deep convection scheme in CAM5, using a stochastic importance-sampling algorithm that can progressively converge to optimal parameter values. The impact of improved deep convection on the global circulation and climate was subsequently evaluated. Our results show that the simulated convective precipitation is most sensitive to the parameters of the convective available potential energy consumption time scale, parcel fractional mass entrainment rate, and maximum downdraft mass flux fraction. Using the optimal parameters constrained by the observed Tropical Rainfall Measuring Mission, convective precipitation improves the simulation of convective to stratiform precipitation ratio and rain-rate spectrum remarkably. When convection is suppressed, precipitation tends to be more confined to the regions with strong atmospheric convergence. As the optimal parameters are used, positive impacts on some aspects of the atmospheric circulation and climate, including reduction of the double Intertropical Convergence Zone, improved East Asian monsoon precipitation, and improved annual cycles of the cross-equatorial jets, are found as a result of the vertical and horizontal redistribution of latent heat release from the revised parameterization. Positive impacts of the optimal parameters derived from the 2° simulations are found to transfer to the 1° simulations to some extent. © 2012. American Geophysical Union. 资助项目: 41130963
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64015
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Atmospheric Sciences, Nanjing University, Nanjing, China; Pacific Northwest National Laboratory, MS K9-24, PO Box 999, Richland, WA 99354, United States; Scripps Institution of Oceanography, University of California, San Diego, CA, United States
Recommended Citation:
Yang B.,Qian Y.,Lin G.,et al. Uncertainty quantification and parameter tuning in the cam5 zhang-mcfarlane convection scheme and impact of improved convection on the global circulation and climate[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(2)