DOI: 10.1002/jgrd.50841
论文题名: Identification of extreme precipitation threat across midlatitude regions based on short-wave circulations
作者: Wang S.-Y. ; Davies R.E. ; Gillies R.R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 11059
结束页码: 11074
语种: 英语
英文关键词: climate change
; Extreme
; flood
; short waves
Scopus关键词: Climate change
; Floods
; Greenhouse gases
; Thunderstorms
; Atmospheric conditions
; Coupled Model Intercomparison Project
; Extreme
; Extreme precipitation
; Extreme precipitation events
; Meridional gradients
; Precipitation extremes
; Short waves
; Precipitation (meteorology)
; atmospheric circulation
; climate change
; drought
; extreme event
; flood
; greenhouse gas
; midlatitude environment
; precipitation (climatology)
; regional climate
; Rossby wave
; teleconnection
; thunderstorm
; Australia
; Queensland
英文摘要: The most severe thunderstorms, producing extreme precipitation, occur over subtropical and midlatitude regions. Atmospheric conditions conducive to organized, intense thunderstorms commonly involve the coupling of a low-level jet (LLJ) with a synoptic short wave. The midlatitude synoptic activity is frequently modulated by the circumglobal teleconnection (CGT), in which meridional gradients of the jet stream act as a guide for short Rossby waves. Previous research has linked extreme precipitation events with either the CGT or the LLJ but has not linked the two circulation features together. In this study, a circulation-based index was developed by combining (a) the degree of the CGT and LLJ coupling, (b) the extent to which this CGT-LLJ coupling connects to regional precipitation and (c) the spatial correspondence with the CGT (short wave) trending pattern over the recent 32 years (1979-2010). Four modern-era global reanalyses, in conjunction with four gridded precipitation data sets, were utilized to minimize spurious trends. The results are suggestive of a link between the CGT/LLJ trends and several recent extreme precipitation events, including those leading to the 2008 Midwest flood in U.S., the 2011 tornado outbreaks in southeastern U.S., the 2010 Queensland flood in northeastern Australia, and to the opposite side the 2012 central U.S. drought. Moreover, an analysis of three Coupled Model Intercomparison Project Phase 5 models from the historical experiments points to the role of greenhouse gases in forming the CGT trends during the warm season. Key Points The arctic amplification likely modifies short-wave circulations Modified upper-level circulation affects low-level moisture flux The combined effect enhances precipitation extremes in certain regions ©2013. American Geophysical Union. All Rights Reserved. 资助项目: NNX13AC37G
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63232
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Utah Climate Center, Utah State University, 4820 Old Main Hill, Logan, UT 84322, United States; Department of Plants, Soils, and Climate, Utah State University, Logan UT, United States
Recommended Citation:
Wang S.-Y.,Davies R.E.,Gillies R.R.. Identification of extreme precipitation threat across midlatitude regions based on short-wave circulations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)