| DOI: | 10.1175/JCLI-D-12-00053.1
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| Scopus记录号: | 2-s2.0-84877800436
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| 论文题名: | Inactive period of Western North Pacific tropical cyclone activity in 1998-2011 |
| 作者: | Liu K.S.; Chan J.C.L.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2013
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| 卷: | 26, 期:8 | | 起始页码: | 2614
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| 结束页码: | 2630
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| 语种: | 英语
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| Scopus关键词: | Atmospheric conditions
; Decadal variations
; Geo-potential heights
; Inter-decadal variations
; Multi-decadal time scale
; Tropical cyclone activity
; Vertical wind shear
; Western North Pacific
; Hurricanes
; Tropics
; Shear flow
; cyclogenesis
; decadal variation
; geopotential
; temperature anomaly
; tropical cyclone
; wind shear
; zonal wind
; Pacific Ocean
; Pacific Ocean (North)
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| 英文摘要: | Tropical cyclone (TC) activity over the western North Pacific (WNP) exhibits a significant interdecadal variation during 1960-2011, with two distinct active and inactive periods each. This study examines changes in TC activity and atmospheric conditions in the recent inactive period (1998-2011). The overall TC activity shows a significant decrease, which is partly related to the decadal variation of TC genesis frequency in the southeastern part of the WNP and the downward trend of TC genesis frequency in the main development region. The investigation on the factors responsible for the low TC activity mainly focuses on the effect of vertical wind shear and subtropical high on multidecadal time scales. Avertical wind shear index, defined as the mean magnitude of the difference of the 200- and 850-hPa horizontal zonal winds (10°-17.5°N, 150°E-180°) averaged between June and October, is highly correlated with the annual TC number and shows a significant interdecadal variation. Positive anomalies of vertical wind shear are generally found in the eastern part of the tropical WNP during this inactive period. Asubtropical high area index, calculated as the area enclosed by the 5880-gpm line of the June-October 500-hPa geopotential height (0°-40°N, 100°E-180°), shows a significant upward trend. A high correlation is also found between this index and the annual TC number, and a stronger-than-normal subtropical high is generally observed during this inactive period. The strong vertical wind shear and strong subtropical high observed during 1998-2011 together apparently lead to unfavorable atmospheric conditions for TC genesis and hence the low TC activity during the period. © 2013 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/51884
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong
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| Recommended Citation: | |
Liu K.S.,Chan J.C.L.. Inactive period of Western North Pacific tropical cyclone activity in 1998-2011[J]. Journal of Climate,2013-01-01,26(8)
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