DOI: 10.1007/s00382-017-4046-6
Scopus记录号: 2-s2.0-85038408408
论文题名: Physical processes controlling earlier and later onset of a typhoon season in the western North Pacific
作者: Zuo H. ; Li T. ; Liu J. ; Peng M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-07-08 起始页码: 2807
结束页码: 2823
语种: 英语
英文关键词: Earlier or later onset of a typhoon season
; Environmental moisture change
; Vertical wind shear
Scopus关键词: annual variation
; anticyclone
; atmospheric moisture
; environmental change
; humidity
; typhoon
; wind shear
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (North)
; Pacific Ocean (West)
英文摘要: The interannual variability of typhoon onset date in western North Pacific (WNP) during 1979–2015 is investigated. The average date in the earlier (later) onset group is early April (late July). A diagnosis of the genesis potential index shows that the key factor affecting the earlier and later onset lies in the background moisture field. According to their evolution feature, the earlier onset cases are further divided into two sub-groups. In the first sub-group, positive specific humidity anomalies were confined in the western WNP and caused primarily by circulation anomalies associated with a La Niña in the equatorial eastern Pacific. In the second sub-group, positive specific humidity anomalies were confined in the eastern WNP and caused by anomalous convection associated with the Pacific Meridional Mode (PMM) in the tropical and subtropical eastern Pacific. In the later onset composite, negative specific humidity anomalies appear in the WNP, and were accompanied by an anomalous anticyclone in situ and a V-shape negative SSTA pattern in the western Pacific. In addition, the change of background vertical wind shear (VWS) also influences the TC onset date. A decrease (increase) in the VWS magnitude and an easterly (westerly) shear anomaly occur in the earlier (later) onset composite. Physically it is argued that both the magnitude of the VWS and the sign of anomalous zonal wind shear may affect TC formation in the WNP. © 2017, Springer-Verlag GmbH Germany, part of Springer Nature.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109094
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China; International Pacific Research Center and Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, HI 96822, United States; Naval Research Laboratory, Monterey, CA, United States
Recommended Citation:
Zuo H.,Li T.,Liu J.,et al. Physical processes controlling earlier and later onset of a typhoon season in the western North Pacific[J]. Climate Dynamics,2018-01-01,51(2018-07-08)