DOI: 10.1007/s00382-014-2118-4
Scopus记录号: 2-s2.0-84896551486
论文题名: Calibration of a convective parameterization scheme in the WRF model and its impact on the simulation of East Asian summer monsoon precipitation
作者: Yang B. ; Zhang Y. ; Qian Y. ; Huang A. ; Yan H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-05-06 起始页码: 1661
结束页码: 1684
语种: 英语
英文关键词: Convection scheme
; Parameter calibration
; The East Asian summer monsoon precipitation
; WRF model simulation
英文摘要: Reasonably modeling the magnitude, south–north gradient and seasonal propagation of precipitation associated with the East Asian summer monsoon (EASM) is a challenging task in the climate community. In this study we calibrate five key parameters in the Kain–Fritsch convection scheme in the WRF model using an efficient importance-sampling algorithm to improve the EASM simulation. We also examine the impacts of the improved EASM precipitation on other physical process. Our results suggest similar model sensitivity and values of optimized parameters across years with different EASM intensities. By applying the optimal parameters, the simulated precipitation and surface energy features are generally improved. The parameters related to downdraft, entrainment coefficients and CAPE consumption time (CCT) can most sensitively affect the precipitation and atmospheric features. Larger downdraft coefficient or CCT decrease the heavy rainfall frequency, while larger entrainment coefficient delays the convection development but build up more potential for heavy rainfall events, causing a possible northward shift of rainfall distribution. The CCT is the most sensitive parameter over wet region and the downdraft parameter plays more important roles over drier northern region. Long-term simulations confirm that by using the optimized parameters the precipitation distributions are better simulated in both weak and strong EASM years. Due to more reasonable simulated precipitation condensational heating, the monsoon circulations are also improved. By using the optimized parameters the biases in the retreating (beginning) of Mei-yu (northern China rainfall) simulated by the standard WRF model are evidently reduced and the seasonal and sub-seasonal variations of the monsoon precipitation are remarkably improved. © 2014, The Author(s). 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; DOE, U.S. Department of Energy
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54170
Appears in Collections: 过去全球变化的重建
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作者单位: School of Atmospheric Sciences, Nanjing University, Nanjing, China; Pacific Northwest National Laboratory, Richland, WA, United States; School of Atmospheric Sciences, Lanzhou University, Lanzhou, China
Recommended Citation:
Yang B.,Zhang Y.,Qian Y.,et al. Calibration of a convective parameterization scheme in the WRF model and its impact on the simulation of East Asian summer monsoon precipitation[J]. Climate Dynamics,2015-01-01,44(2017-05-06)