气候变化领域集成服务门户(CCPortal): Tropical and subtropical North Atlantic vertical wind shear and seasonal tropical cyclone activity

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DOI	10.1175/JCLI-D-19-0474.1
	Tropical and subtropical North Atlantic vertical wind shear and seasonal tropical cyclone activity
	Jones J.J.; Bell M.M.; Klotzbach P.J.
发表日期	2020
ISSN	0894-8755
起始页码	5413
结束页码	5426
卷号	33 期号:13
英文摘要	Given recent insights into the role of anticyclonic Rossby wave breaking (AWB) in driving subseasonal and seasonal North Atlantic tropical cyclone (TC) activity, this study further examines tropical versus subtropical impacts on TC activity by considering large-scale influences on boreal summer tropical zonal vertical wind shear (VWS) variability, a key predictor of seasonal TC activity. Through an empirical orthogonal function analysis, it is shown that subtropical AWB activity drives the second mode of variability in tropical zonal VWS, while El Niño-Southern Oscillation (ENSO) primarily drives the leading mode of variability. Linear regressions of the four leading principal components against tropical North Atlantic zonal VWS and accumulated cyclone energy show that while the leading mode holds much of the regression strength, some improvement can be achieved with the addition of the second and third modes. Furthermore, an index of AWB-associated VWS anomalies, a proxy for AWBimpacts on the large-scale environment, may be a better indicator of summertime VWS anomalies. The utilization of this index may be used to better understand AWB's contribution to seasonal TC activity. © 2020 American Meteorological Society.
英文关键词	Atmospheric pressure; Climatology; Hurricanes; Mechanical waves; Orthogonal functions; Shear flow; Storms; Accumulated cyclone energies; Empirical orthogonal function analysis; North Atlantic; Principal Components; Southern oscillation; Tropical cyclone; Tropical cyclone activity; Vertical wind shear; Tropics; anticyclone; principal component analysis; Rossby wave; seasonal variation; tropical cyclone; tropical environment; wind shear; zonal wind; Atlantic Ocean; Atlantic Ocean (North)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171254
作者单位	Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Jones J.J.,Bell M.M.,Klotzbach P.J.. Tropical and subtropical North Atlantic vertical wind shear and seasonal tropical cyclone activity[J],2020,33(13).
APA	Jones J.J.,Bell M.M.,&Klotzbach P.J..(2020).Tropical and subtropical North Atlantic vertical wind shear and seasonal tropical cyclone activity.Journal of Climate,33(13).
MLA	Jones J.J.,et al."Tropical and subtropical North Atlantic vertical wind shear and seasonal tropical cyclone activity".Journal of Climate 33.13(2020).