DOI: 10.1073/pnas.2010547117
论文题名: Summertime stationary waves integrate tropical and extratropical impacts on tropical cyclone activity
作者: Wang Z. ; Zhang G. ; Dunkerton T.J. ; Jin F.-F.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 37 起始页码: 22720
结束页码: 22726
语种: 英语
英文关键词: Rossby wave breaking
; Stationary waves
; Tropical and extratropical interaction
; Tropical cyclone variability
; Tropical upper-tropospheric troughs
Scopus关键词: article
; heating
; hurricane
; Northern Hemisphere
英文摘要: Tropical cyclones (TC) are one of the most severe storm systems on Earth and cause significant loss of life and property upon landfall in coastal areas. A better understanding of their variability mechanisms will help improve the TC seasonal prediction skill and mitigate the destructive impacts of the storms. Early studies focused primarily on tropical processes in regulating the variability of TC activity, while recent studies suggest also some long-range impacts of extratropical processes, such as lateral transport of dry air and potential vorticity by large-scale waves. Here we show that stationary waves in the Northern Hemisphere integrate tropical and extratropical impacts on TC activity in July through October. In particular, tropical upper-tropospheric troughs (TUTTs), as part of the summertime stationary waves, are associated with the variability of large-scale environmental conditions in the tropical North Atlantic and North Pacific and significantly correlated to the variability of TC activity in these basins. TUTTs are subject to the modulation of diabatic heating in various regions and are the preferred locations for extratropical Rossby wave breaking (RWB). A strong TUTT in a basin is associated with enhanced RWB and tropical−extratropical stirring in that basin, and the resultant changes in the tropical atmospheric conditions modulate TC activity. In addition, the anticorrelation of TUTTs between the North Atlantic and North Pacific makes the TC activity indices over the two basins compensate each other, rendering the global TC activity less variable than otherwise would be the case if TUTTs were independent. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164037
Appears in Collections: 气候变化与战略
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作者单位: Wang, Z., Department of Atmospheric Sciences, University of Illinois at Urbana–Champaign, Urbana, IL 61801, United States; Zhang, G., Atmospheric and Oceanic Sciences Program, Princeton University, National Oceanic and Atmospheric Administration/Geophysical Fluid Dynamics Laboratory, Princeton, NJ 08540, United States; Dunkerton, T.J., NorthWest Research Associates, Redmond, WA 98052, United States; Jin, F.-F., Department of Meteorology, University of Hawaii at Manoa, Honolulu, HI 96822, United States
Recommended Citation:
Wang Z.,Zhang G.,Dunkerton T.J.,et al. Summertime stationary waves integrate tropical and extratropical impacts on tropical cyclone activity[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(37)