DOI: 10.1007/s00382-017-3697-7
Scopus记录号: 2-s2.0-85018811967
论文题名: Interdecadal variation of tropical cyclone genesis and its relationship to the convective activities over the central Pacific
作者: Huangfu J. ; Huang R. ; Chen W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-03-04 起始页码: 1439
结束页码: 1450
语种: 英语
英文关键词: Central Pacific
; Convective activities
; Interdecadal variation
; Tropical cyclone genesis
Scopus关键词: convection
; convective system
; cyclogenesis
; decadal variation
; longwave radiation
; tropical cyclone
; vorticity
; Walker circulation
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (North)
英文摘要: Using the outgoing longwave radiation (OLR) data from the National Oceanic and Atmospheric Administration archives, this paper analyzes the interdecadal variation of convective activities over the central Pacific (CP) from July to October of 1979–2013 and its impact on tropical cyclone (TC) genesis in the western North Pacific (WNP). Concurrent with the interdecadal decrease of TC genesis, the tropical convection underwent a significant interdecadal change in the late 1990s. Overall, the first leading empirical orthogonal function mode of the tropical OLR during July–October turned from a zonal dipole pattern during 1979–1997 to a tripole pattern during 1998–2013. Concomitant to this change, the boreal part of the Walker circulation shrank westward, with its downdraft branch located over the CP. The downward motion anomalies over the CP increased after the late 1990s, as did the trade easterlies. Consistent with the CP convective activity anomalies, the negative low-level relative vorticity anomalies and upper-level divergence anomalies, positive vertical wind shear anomalies and anomalous abundant water vapor can be observed over the southeastern part of the WNP. Additionally, the tropical depression (TD)-type waves associated with the CP convective activities are significantly different before and after the late 1990s. Before the late 1990s, the off-equatorial TD-type waves could be distinctly observed, with clear transitions located along the WNP monsoon trough. However, these transitions were vague after the late 1990s. Therefore, the convective activities over the CP may have played an important role in affecting the interdecadal change of TC genesis by affecting the genesis of TD-type waves. © 2017, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109444
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: Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, P.O. Box 2718, Beijing, 100190, China
Recommended Citation:
Huangfu J.,Huang R.,Chen W.. Interdecadal variation of tropical cyclone genesis and its relationship to the convective activities over the central Pacific[J]. Climate Dynamics,2018-01-01,50(2018-03-04)