DOI: 10.1175/JCLI-D-17-0422.1
Scopus记录号: 2-s2.0-85041650298
论文题名: Impacts of the boreal spring Indo-Pacific warm pool hadley circulation on tropical cyclone activity over the western North Pacific
作者: Guo Y.-P. ; Tan Z.-M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 4 起始页码: 1361
结束页码: 1375
语种: 英语
英文关键词: Atmosphere
; Hadley circulation
; Hurricanes
; Hurricanes/typhoons
; Interannual variability
; Tropics
Scopus关键词: Climate change
; Earth atmosphere
; Hurricanes
; Orthogonal functions
; Sea level
; Storms
; Surface waters
; Tropics
; Cyclonic circulation
; Empirical orthogonal function analysis
; Hadley circulation
; Hurricanes/typhoons
; Interannual variability
; Precipitation anomalies
; Tropical cyclone activity
; Western North Pacific
; Oceanography
; annual variation
; Hadley cell
; hurricane
; tropical cyclone
; typhoon
; warm pool
; westerly
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: This study investigated the impacts of the interannual variability in the boreal spring regional Hadley circulation over the Indo-Pacific warm pool (IPWP) on the tropical cyclone (TC) activity over the western North Pacific (WNP). The principal modes of the interannual variability in the IPWP Hadley circulation were calculated using empirical orthogonal function (EOF) analysis. The leading mode (EOF-1) features cross-equatorial southerly wind anomalies over the Indian Ocean and Maritime Continent and has an evident impact on WNP TC activity during summer. In the summer following a positive phase of the EOF-1, a cyclonic circulation anomaly, with upward motion, positive relative vorticity anomalies, and weak sea level pressure, dominates the WNP, and this favors increased TC genesis. However, large positive vertical wind shear anomalies over the South China Sea and Philippine Sea inhibit the TC intensification. A positive wind-sea surface temperature (SST)-precipitation feedback was found to facilitate the ability of the signal of the EOF-1 to persist until the summer. The westerly wind anomalies converge around 10°N over the WNP, thus increasing precipitation, and this increased precipitation enhances the westerly wind anomalies via a Gill-type response. The strengthened westerly wind anomalies increase total wind speeds, which in turn cool the SST in the Bay of Bengal and the South China Sea, and warm the SST in the eastern WNP, increasing the zonal SST gradient. Consequently, this increased zonal SST gradient further enhances the westerly wind anomalies, strengthens the monsoon trough, and increases the WNP precipitation further. Therefore, the WNP precipitation anomalies are sustained into the summer. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111666
Appears in Collections: 气候减缓与适应
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作者单位: Key Laboratory of Mesoscale Severe Weather, Ministry of Education, School of Atmospheric Sciences, Nanjing University, Nanjing, China
Recommended Citation:
Guo Y.-P.,Tan Z.-M.. Impacts of the boreal spring Indo-Pacific warm pool hadley circulation on tropical cyclone activity over the western North Pacific[J]. Journal of Climate,2018-01-01,31(4)