globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-014-2262-x
Scopus记录号: 2-s2.0-84939777107
论文题名:
Dynamical downscaling of CMIP5 global circulation models over CORDEX-Africa with COSMO-CLM: evaluation over the present climate and analysis of the added value
作者: Dosio A.; Panitz H.-J.; Schubert-Frisius M.; Lüthi D.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期:2017-09-10
起始页码: 2637
结束页码: 2661
语种: 英语
英文关键词: Added value ; CMIP5 GCMs ; CORDEX-Africa ; COSMO-CLM regional climate model
英文摘要: In this work we present the results of the application of the consortium for small-scale modeling (COSMO) regional climate model (COSMO-CLM, hereafter, CCLM) over Africa in the context of the coordinated regional climate downscaling experiment. An ensemble of climate change projections has been created by downscaling the simulations of four global climate models (GCM), namely: MPI-ESM-LR, HadGEM2-ES, CNRM-CM5, and EC-Earth. Here we compare the results of CCLM to those of the driving GCMs over the present climate, in order to investigate whether RCMs are effectively able to add value, at regional scale, to the performances of GCMs. It is found that, in general, the geographical distribution of mean sea level pressure, surface temperature and seasonal precipitation is strongly affected by the boundary conditions (i.e. driving GCMs), and seasonal statistics are not always improved by the downscaling. However, CCLM is generally able to better represent the annual cycle of precipitation, in particular over Southern Africa and the West Africa monsoon (WAM) area. By performing a singular spectrum analysis it is found that CCLM is able to reproduce satisfactorily the annual and sub-annual principal components of the precipitation time series over the Guinea Gulf, whereas the GCMs are in general not able to simulate the bimodal distribution due to the passage of the WAM and show a unimodal precipitation annual cycle. Furthermore, it is shown that CCLM is able to better reproduce the probability distribution function of precipitation and some impact-relevant indices such as the number of consecutive wet and dry days, and the frequency of heavy rain events. © 2014, The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54159
Appears in Collections:过去全球变化的重建

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作者单位: Institute for Environment and Sustainability, European Commission Joint Research Centre, via E.Fermi 2749, Ispra, VA, Italy; Karlsruher Institut für Technologie, Karlsruhe, Germany; Helmholtz-Zentrum Geesthacht, Geesthacht, Germany; Swiss Federal Institute of Technology (ETH), Zurich, Switzerland

Recommended Citation:
Dosio A.,Panitz H.-J.,Schubert-Frisius M.,et al. Dynamical downscaling of CMIP5 global circulation models over CORDEX-Africa with COSMO-CLM: evaluation over the present climate and analysis of the added value[J]. Climate Dynamics,2015-01-01,44(2017-09-10)
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