气候变化领域集成服务门户(CCPortal): Representation of climate in reanalyses: An intercomparison for Europe and North America

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DOI	10.1175/JCLI-D-20-0609.1
	Representation of climate in reanalyses: An intercomparison for Europe and North America
	Keller J.D.; Wahl S.
发表日期	2021
ISSN	08948755
起始页码	1667
结束页码	1684
卷号	34 期号:5
英文摘要	Atmospheric reanalysis datasets are a major tool to assess climate and its variability for past decades in a broad spectrum of applications. Nowadays, global reanalysis systems are available in third- and fourth-generation versions. They benefit from continuous improvements of numerical models and data assimilation schemes thus utilizing a growing number of observing systems. In the past decade, global reanalyses have been complemented by several regional reanalyses with enhanced horizontal resolution and appropriate model physics. Due to the considerable technical overhead associated with the comparison of reanalyses, it is difficult for users to identify an optimal dataset for their needs. Therefore, this study strives to provide a comprehensive intercomparison of the representation of climate in various reanalyses. The study compares four global reanalyses and three regional reanalyses over Europe and North America with in situ observations. The focus lies on the representation of near-surface temperature and precipitation expressed through various climate indices. The comparison shows that performances of the different reanalyses vary considerably depending on the parameter(s) of interest, the region, and the type of aggregation. The main findings are that regional reanalyses provide added value especially with regard to precipitation. While ECMWF's newest reanalysis ERA5 is in better agreement with observations compared to the other global reanalyses for most climate indices over Europe, it is still outperformed by its predecessor ERA-Interim over North America. To support users in identifying an appropriate reanalysis for their needs, the study is complemented by comprehensive supplemental material. © 2021 American Meteorological Society
英文关键词	Climate classification/regimes; Climate variability; Model comparison; Reanalysis data
语种	英语
scopus关键词	Climatology; Appropriate models; Atmospheric reanalysis; Continuous improvements; Fourth generation; Horizontal resolution; In-situ observations; Near surface temperature; Observing systems; Climate models; climate classification; climate variation; comparative study; identification method; image resolution; model test; parameterization; performance assessment; precipitation (climatology); regional climate; temporal variation; Europe; North America
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178706
作者单位	Hans-Ertel-Centre for Weather Research, Climate Monitoring and Diagnostics, Germany; Deutscher Wetterdienst, Offenbach, Germany; University of Bonn, Germany
推荐引用方式 GB/T 7714	Keller J.D.,Wahl S.. Representation of climate in reanalyses: An intercomparison for Europe and North America[J],2021,34(5).
APA	Keller J.D.,&Wahl S..(2021).Representation of climate in reanalyses: An intercomparison for Europe and North America.Journal of Climate,34(5).
MLA	Keller J.D.,et al."Representation of climate in reanalyses: An intercomparison for Europe and North America".Journal of Climate 34.5(2021).