DOI: 10.1002/2015GL063968
论文题名: Changes in the seasonality of tornado and favorable genesis conditions in the central United States
作者: Lu M. ; Tippett M. ; Lall U.
刊名: Geophysical Research Letters
ISSN: 0094-9137
EISSN: 1944-8868
出版年: 2015
卷: 42, 期: 10 起始页码: 4224
结束页码: 4231
语种: 英语
英文关键词: genesis conditions
; North America
; spatial Poisson process
; tornado seasonality
; wavelets analysis
Scopus关键词: Potential energy
; Wavelet analysis
; Genesis conditions
; North America
; Seasonality
; Spatial Poisson process
; Wavelets analysis
; Tornadoes
; diagenesis
; environmental conditions
; Poisson ratio
; potential energy
; seasonal variation
; seasonality
; storm surge
; tornado
; wavelet analysis
; United States
英文摘要: We analyze changes in the seasonality of tornado reports and related environmental conditions over the central U.S. Tornado counts are normalized by annual totals to reduce effects of changing reporting practices. Wavelet analysis of the normalized tornado counts shows significant power at semiannual and annual frequencies. An environmental index based on convective available potential energy and storm relative helicity shows power at the same frequencies. Reconstruction of the normalized tornado counts and the environmental index at these frequencies provides a time-filtered description of their seasonal variation. Onset and peak dates of the tornado season defined from the reconstruction are significantly correlated with those of the environmental index over the period 1979-2013 and are found to have trends of -3.7 and -3.8 days/decade, respectively. The agreement between changes in tornado report seasonality and those of the environmental index is evidence that the trends have a physical origin. ©2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931574203&doi=10.1002%2f2015GL063968&partnerID=40&md5=2e161a8b7c6265cf4551ef8f602646e0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8753
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Applied Physics and Applied Math, Columbia University, New York, NY, United States
Recommended Citation:
Lu M.,Tippett M.,Lall U.. Changes in the seasonality of tornado and favorable genesis conditions in the central United States[J]. Geophysical Research Letters,2015-01-01,42(10).