DOI: 10.1175/JCLI-D-12-00692.1
Scopus记录号: 2-s2.0-84885335365
论文题名: Heavy rainfall induced by tropical cyclones across northern taiwan and associated intraseasonal oscillation modulation
作者: Chen J.-M. ; Tan P.-H. ; Shih C.-F.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 20 起始页码: 7992
结束页码: 8007
语种: 英语
Scopus关键词: Heavy rainfall
; Intraseasonal oscillations
; Moisture convergence
; Northern Taiwan
; South China sea
; Tropical cyclone
; Tropical Western Pacific
; Hurricanes
; Modulation
; Moisture
; Tropical engineering
; Rain
; climate oscillation
; moisture flux
; rainfall
; storm track
; tropical cyclone
; westerly
; Pacific Ocean
; South China Sea
; Taiwan
英文摘要: Tropical cyclones (TCs) moving northwestward/westward across northern Taiwan are defined to have a type-2 track. This study aims to analyze heavy rainfall associated with type-2 TCs in Taiwan, focusing on the modulation processes of the intraseasonal oscillation (ISO). During 1958-2011, 21 summer type-2 TCs are separated into three rainfall types: strong, moderate, and weak. For the strong rainfall type, both 30-60-day and 10-24-day ISOs propagate northwestward across Taiwan. During landfall and the ensuing two days, both ISOs exhibit a cyclonic anomaly centering northwest of Taiwan that causes anomalous westerly flows (or enhance seasonal southwesterly flows) from the South China Sea (SCS) onto Taiwan. Persistent moisture supply and strong moisture convergence result in prolonged heavy rainfall on the windward side over western Taiwan. TCs with weak rainfall are accompanied by a northward-propagating 30-60-day ISO from the tropical western Pacific toward Japan and a westward-propagating 10-24-day ISO along 20°Nlatitude. During the landfall stage both ISOs have a cyclonic anomaly with its center south of Taiwan. Major anomalous westerly flows are displaced southward across the central SCS, leading to a weak moisture supply and rainfall in Taiwan. The moderate rainfall type features a 30-60-day (10-24 day) ISO resembling that of the weak (strong) rainfall type. The amount of rainfall thus ranges between the strong and weak rainfall types. Major processes regulating the rainfall of type-2 TCs relate to the intensity of the moisture supply associated with anomalous westerly flows from the SCS onto Taiwan, which is jointly modulated by 30-60-day and 10-24-day ISOs. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51591
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Maritime Information and Technology, National Kaohsiung Marine University, Kaohsiung, Taiwan; Department of History and Geography, National Chiayi University, Chiayi, Taiwan; Marine Meteorology Center, Central Weather Bureau, Taipei, Taiwan
Recommended Citation:
Chen J.-M.,Tan P.-H.,Shih C.-F.. Heavy rainfall induced by tropical cyclones across northern taiwan and associated intraseasonal oscillation modulation[J]. Journal of Climate,2013-01-01,26(20)