气候变化领域集成服务门户(CCPortal): General Circulation Model Selection Technique for Downscaling: Exemplary Application to East Africa

CCPortal

DOI	10.1029/2020JD033033
	General Circulation Model Selection Technique for Downscaling: Exemplary Application to East Africa
	Pickler C.; Mölg T.
发表日期	2021
ISSN	2169897X
卷号	126 期号:6
英文摘要	Downscaling is widely used in studies of local and/or regional climate as it yields a greater spatial resolution than general circulation models (GCMs) can provide. It utilizes GCM output or reanalysis data, which is transformed using mathematical relationships or used to force the lateral boundaries of a regional climate model. However, there is no set selection technique to determine which GCM realization(s) to employ. Here, a comprehensive yet easily applicable model selection technique for studies requiring GCM data as a constraint was developed. The technique evaluates, with respect to a reanalysis product and/or observational data, the ability of GCM realizations to reconstruct the mean state of the climate and the space-time climatic anomalies for the atmospheric state variables at three distinct pressure levels. It was applied to the region of East Africa, where GISS-E2-H r6i1p3 was found to perform the strongest. The top ranked realizations were found to better capture processes when evaluated for the example of the Indian Ocean Dipole. Furthermore, the surface air temperature and precipitation from three 10-year regional climate model simulations, one forced by the Modern-Era Retrospective Analysis for Research and Applications version 2 reanalysis, one forced by the top ranked GCM, and one by the lowest ranked one, were compared to gridded observations. Results show that using a top ranked GCM for the boundary conditions leads to a better dynamical downscaling simulation than a low-ranked GCM, suggesting the potential of the proposed technique for future downscaling techniques. © 2021. The Authors.
英文关键词	downscaling; East Africa; general circulation models; model selection
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185394
作者单位	Climate System Research Group, Institute of Geography, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
推荐引用方式 GB/T 7714	Pickler C.,Mölg T.. General Circulation Model Selection Technique for Downscaling: Exemplary Application to East Africa[J],2021,126(6).
APA	Pickler C.,&Mölg T..(2021).General Circulation Model Selection Technique for Downscaling: Exemplary Application to East Africa.Journal of Geophysical Research: Atmospheres,126(6).
MLA	Pickler C.,et al."General Circulation Model Selection Technique for Downscaling: Exemplary Application to East Africa".Journal of Geophysical Research: Atmospheres 126.6(2021).