DOI: 10.1175/JCLI-D-11-00358.1
Scopus记录号: 2-s2.0-84865172602
论文题名: A comparison of decadal-to-interdecadal variability and trend in reanalysis datasets using atmospheric angular momentum
作者: Paek H. ; Huang H.-P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 13 起始页码: 4750
结束页码: 4758
语种: 英语
Scopus关键词: Atmospheric circulation
; Climate record
; Climate variability
; Decadal variability
; Inter-decadal variability
; Trends
; Climate change
; Troposphere
; Angular momentum
; angular momentum
; atmospheric circulation
; climate change
; climate variation
; decadal variation
; trend analysis
; twentieth century
英文摘要: An intercomparison of the global relative angular momentum M R in five reanalysis datasets, including the Twentieth Century Reanalysis (20CR), is performed for the second half of the twentieth century. The intercomparison forms a stringent test for 20CR because the variability of M R is known to be strongly influenced by the variability of upper-tropospheric zonal wind whereas 20CR assimilated only surface observations. The analysis reveals good agreement for decadal-to-multidecadal variability among all of the datasets, including 20CR, for the second half of the twentieth century. The discrepancies among different datasets are mainly in the slowest component, the long-term trend, of MR. Once the data are detrended, the resulting decadal-to-multidecadal variability shows even better agreement among all of the datasets. This result indicates that 20CR can be reliably used for the analysis of decadal-to-interdecadal variability in the pre-1950 era, provided that the data are properly detrended. As a quick application, it is found that the increase in M R during the 1976/77 climate-shift event remains the sharpest over the entire period from 1871 to 2008 covered by 20CR. The nontrivial difference in the long-term trend between 20CR and the other reanalysis datasets found in this study provides a caution against using 20CR to determine the trend on the centennial time scale that is relevant to climate change. These conclusions are restricted to the quantities that depend strongly on the upper-tropospheric zonal wind, but the approach adopted in this work will be useful for future intercomparisons of the low-frequency behavior of other climate indices in the reanalysis datasets. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52352
Appears in Collections: 气候变化事实与影响
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作者单位: School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ, United States
Recommended Citation:
Paek H.,Huang H.-P.. A comparison of decadal-to-interdecadal variability and trend in reanalysis datasets using atmospheric angular momentum[J]. Journal of Climate,2012-01-01,25(13)