DOI: 10.1007/s00382-014-2199-0
Scopus记录号: 2-s2.0-84939879226
论文题名: Regional climate model sensitivities to parametrizations of convection and non-precipitating subgrid-scale clouds over South America
作者: Lange S. ; Rockel B. ; Volkholz J. ; Bookhagen B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-09-10 起始页码: 2839
结束页码: 2857
语种: 英语
英文关键词: Clouds
; Convection
; COSMO-CLM
; Precipitation
; Radiation
; South America
英文摘要: This study provides a first thorough evaluation of the COnsortium for Small scale MOdeling weather prediction model in CLimate Mode (COSMO-CLM) over South America. Simulations are driven by ERA-Interim reanalysis data. Besides precipitation, we examine the surface radiation budget, cloud cover, 2 m temperatures, and the low level circulation. We evaluate against reanalysis data as well as observations from ground stations and satellites. Our analysis focuses on the sensitivity of results to the convective parametrization in comparison to their sensitivity to the representation of non-precipitating subgrid-scale clouds in the parametrization of radiation. Specifically, we compare simulations with a relative humidity versus a statistical subgrid-scale cloud scheme, in combination with convection schemes according to Tiedtke (Mon Weather Rev 117(8):1779–1800, 1989) and from the European Centre for Medium-Range Weather Forecasts Integrated Forecasting System (IFS) cycle 33r1. The sensitivity of simulated tropical precipitation to the parametrizations of convection and subgrid-scale clouds is of similar magnitude. We show that model runs with different subgrid-scale cloud schemes produce substantially different cloud ice and liquid water contents. This impacts surface radiation budgets, and in turn convection and precipitation. Considering all evaluated variables in synopsis, the model performs best with the (both non-default) IFS and statistical schemes for convection and subgrid-scale clouds, respectively. Despite several remaining deficiencies, such as a poor simulation of the diurnal cycle of precipitation or a substantial austral summer warm bias in northern Argentina, this new setup considerably reduces long-standing model biases, which have been a feature of COSMO-CLM across tropical domains. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54166
Appears in Collections: 过去全球变化的重建
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作者单位: Potsdam Institute for Climate Impact Research, Potsdam, Brandenburg, Germany; Department of Physics, Humboldt University, Berlin, Germany; Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Schleswig-Holstein, Germany; Department of Geography, University of California, Santa Barbara, CA, United States
Recommended Citation:
Lange S.,Rockel B.,Volkholz J.,et al. Regional climate model sensitivities to parametrizations of convection and non-precipitating subgrid-scale clouds over South America[J]. Climate Dynamics,2015-01-01,44(2017-09-10)