DOI: 10.1007/s00382-013-1996-1
Scopus记录号: 2-s2.0-84901985929
论文题名: An evaluation of the statistical homogeneity of the Twentieth Century Reanalysis
作者: Ferguson C.R. ; Villarini G.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-11-12 起始页码: 2841
结束页码: 2866
语种: 英语
英文关键词: Change point detection
; Climate trend analysis
; Observational shocks
; Sparse data assimilation
; Twentieth Century Reanalysis
英文摘要: The Twentieth Century Reanalysis (20CR) holds the distinction of having the longest record length (140-year; 1871-2010) of any existing global atmospheric reanalysis. If the record can be shown to be homogenous, then it would be the first reanalysis suitable for long-term trend assessments, including those of the regional hydrologic cycle. On the other hand, if discontinuities exist, then their detection and attribution-either to artificial observational shocks or climate change-is critical to their proper treatment. Previous research suggested that the quintupling of 20CR's assimilated observation counts over the central United States was the primary cause of inhomogeneities for that region. The same work also revealed that, depending on the season, the complete record could be considered homogenous. In this study, we apply the Bai-Perron structural change point test to extend these analyses globally. A rigorous evaluation of 20CR's (in)homogeneity is performed, composed of detailed quantitative analyses on regional, seasonal, inter-variable, and intra-ensemble bases. The 20CR record is shown to be homogenous (natural) for 69 (89) years at 50 % of land grids, based on analysis of the July 2 m air temperature. On average 54 % (41 %) of the grids between 60°S and 60°N are free from artificial inhomogenetites in their February (July) time series. Of the more than 853,376 abrupt shifts detected in 26 variable fields over two monthly time series, approximately 72 % are non-climate in origin; 25 % exceed 1.8 standard deviations of the preceding time series. The knock-on effect of inhomogeneities in 20CR's boundary forcing and surface pressure data inputs to its surface analysis fields is implicated. In the future, reassessing these inhomogeneities will be imperative to achieving a more definitive attribution of 20CR's abrupt shifts. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: DOE, National Science Foundation
; JSPS, National Science Foundation
; NCAR, National Science Foundation
; NOAA, National Science Foundation
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54450
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Hydrology and Water Resources Engineering, Institute of Industrial Science, The University of Tokyo, Tokyo, Japan; Department of Environmental Resources Engineering, The State University of New York College of Environmental Science and Forestry, Syracuse, NY, United States; IIHR, Hydroscience and Engineering, The University of Iowa, Iowa City, IA, United States
Recommended Citation:
Ferguson C.R.,Villarini G.. An evaluation of the statistical homogeneity of the Twentieth Century Reanalysis[J]. Climate Dynamics,2014-01-01,42(2017-11-12)