DOI: 10.1175/JCLI-D-11-00619.1
Scopus记录号: 2-s2.0-84871903639
论文题名: Investigating the use of a genesis potential index for tropical cyclones in the North Atlantic basin
作者: Bruyère C.L. ; Holland G.J. ; Towler E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 24 起始页码: 8611
结束页码: 8626
语种: 英语
Scopus关键词: Climate prediction
; Climate simulation
; Climate variability
; Cyclone frequency
; Down-scaling
; Empirical index
; Environmental variables
; Frequency variability
; Frequency variation
; Interannual
; Interannual variability
; Interannual variation
; Large-scale analysis
; Model simulation
; North Atlantic
; Seasonal variation
; Tropical cyclone
; Vertical shear
; Climatology
; Computer simulation
; Storms
; Hurricanes
; climate modeling
; climate prediction
; hurricane
; seasonal variation
; tropical cyclone
; typhoon
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: Large-scale environmental variables known to be linked to the formation of tropical cyclones have previously been used to develop empirical indices as proxies for assessing cyclone frequency from large-scale analyses or model simulations. Here the authors examine the ability of two recent indices, the genesis potential (GP) and the genesis potential index, to reproduce observed North Atlantic cyclone annual frequency variations and trends. These skillfully estimate the mean seasonal variation of observed cyclones, but they struggle with reproducing interannual frequency variability and change. Examination of the independent contributions by the four terms that make up the indices finds that potential intensity and shear have significant skill, while moisture and vorticity either do not contribute to or degrade the indices' capacity to reproduce observed interannual variability. It is also found that for assessing basinwide cyclone frequency, averaging indices over the whole basin is less skillful than its application to the general area off the coast of Africa broadly covering the main development region (MDR). These results point to a revised index, the cyclone genesis index (CGI), which comprises only potential intensity and vertical shear. Application of the CGI averaged over the MDR demonstrates high and significant skill at reproducing interannual variations and trends in all-basin cyclones across both reanalyses. The CGI also provides a more accurate reproduction of seasonal variations than the original GP. Future work applying the CGI to other tropical cyclone basins and to the downscaling of relatively course climate simulations is briefly addressed. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52104
Appears in Collections: 气候变化事实与影响
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作者单位: National Center for Atmospheric Research, 3090 Center Green Drive, Boulder, CO 80301, United States
Recommended Citation:
Bruyère C.L.,Holland G.J.,Towler E.. Investigating the use of a genesis potential index for tropical cyclones in the North Atlantic basin[J]. Journal of Climate,2012-01-01,25(24)