NDLI: Diagnosis of seasonal variations of tropical cyclogenesis over the South China Sea using a genesis potential index

Content Provider	Springer Nature Link
Author	Wang, Lei Pan, Xiumei
Copyright Year	2012
Abstract	This study examines the seasonal variations of tropical cyclogenesis over the South China Sea (SCS) using a genesis potential (GP) index developed by Emanuel and Nolan. How different environmental factors (including low-level vorticity, mid-level relative humidity, vertical wind shear, and potential intensity) contribute to these variations is investigated. Composite anomalies of the GP index are produced for the summer and winter monsoons separately. These composites replicate the observed seasonal variations of the observed frequency and location of tropical cyclogenesis over the SCS. The degree of contribution by each factor in different regions is determined quantitatively by producing composites of modified indices in which only one of the contributing factors varies, with the others set to climatology. Over the northern SCS, potential intensity makes the largest contributions to the seasonal variations in tropical cyclogenesis. Over the southern SCS, the low-level relative vorticity plays the primary role in the seasonal modulation of tropical cyclone (TC) genesis frequency, and the vertical wind shear plays the secondary role. Thermodynamic factors play more important roles for the seasonal variations in tropical cyclogenesis over the northern SCS, while dynamic factors are more important in the seasonal modulation of TC genesis frequency over the southern SCS.
Starting Page	267
Ending Page	278
Page Count	12
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	11
Issue Number	3
e-ISSN	19935021
Language	English
Publisher	SP Science Press
Publisher Date	2012-07-24
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	tropical cyclone seasonal variation South China Sea monsoon GP index Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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