DOI: 10.1007/s00382-015-2959-5
Scopus记录号: 2-s2.0-84975693097
论文题名: A multimodel intercomparison of resolution effects on precipitation: simulations and theory
作者: Rauscher S.A. ; O’Brien T.A. ; Piani C. ; Coppola E. ; Giorgi F. ; Collins W.D. ; Lawston P.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-07-08 起始页码: 2205
结束页码: 2218
语种: 英语
英文关键词: Model resolution
; Precipitation
; Regional climate modeling
英文摘要: An ensemble of six pairs of RCM experiments performed at 25 and 50 km for the period 1961–2000 over a large European domain is examined in order to evaluate the effects of resolution on the simulation of daily precipitation statistics. Application of the non-parametric two-sample Kolmorgorov–Smirnov test, which tests for differences in the location and shape of the probability distributions of two samples, shows that the distribution of daily precipitation differs between the pairs of simulations over most land areas in both summer and winter, with the strongest signal over southern Europe. Two-dimensional histograms reveal that precipitation intensity increases with resolution over almost the entire domain in both winter and summer. In addition, the 25 km simulations have more dry days than the 50 km simulations. The increase in dry days with resolution is indicative of an improvement in model performance at higher resolution, while the more intense precipitation exceeds observed values. The systematic increase in precipitation extremes with resolution across all models suggests that this response is fundamental to model formulation. Simple theoretical arguments suggest that fluid continuity, combined with the emergent scaling properties of the horizontal wind field, results in an increase in resolved vertical transport as grid spacing decreases. This increase in resolution-dependent vertical mass flux then drives an intensification of convergence and resolvable-scale precipitation as grid spacing decreases. This theoretical result could help explain the increasingly, and often anomalously, large stratiform contribution to total rainfall observed with increasing resolution in many regional and global models. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53539
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geography, University of Delaware, Newark, DE, United States; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Department of Computer Science, Mathematics and Environmental Science, American University of Paris, Paris, France; Earth System Physics Section, International Centre for Theoretical Physics, Trieste, Italy; Earth and Planetary Sciences Department, University of California, Berkeley, CA, United States
Recommended Citation:
Rauscher S.A.,O’Brien T.A.,Piani C.,et al. A multimodel intercomparison of resolution effects on precipitation: simulations and theory[J]. Climate Dynamics,2016-01-01,47(2017-07-08)