Journal
INTERNATIONAL JOURNAL OF CLIMATOLOGY
Volume 39, Issue 1, Pages 101-111Publisher
WILEY
DOI: 10.1002/joc.5785
Keywords
South China Sea; south Indian Ocean Dipole; tropical cyclones
Categories
Funding
- Fundamental Research Funds For the Central Universities [16lgpy02]
- LASW State Key Laboratory Special Fund [2016LASW-B01]
- National Key Scientific Research Plan of China [2014CB953900]
- National Natural Science Foundation of China [41690123, 41690120, 41661144019, 41375081, 41530530]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [[2015]311]
- Zhuhai Joint Innovative Center for Climate, Environment and Ecosystem
- Jiangsu Collaborative Innovation Center for Climate Change
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This study investigates the impact of the south Indian Ocean Dipole (SIOD) on the frequency of tropical cyclones (TCs) over the South China Sea (SCS) in summer (May-August) and winter (September-December) for 1975-2012. The frequency of TCs over the SCS shows significant inter-annual variations in the two seasons and relatively obvious inter-decadal variability in summer. A prominent relationship occurs between the TC generation over the SCS and the SIOD, and the latter can be regarded as a good predictor of the former on inter-annual scale. In winter, vertical circulation is obvious due to a strong SIOD induces intensified ascending motions and high sea surface temperature over the northern SCS with sufficient moisture that supplies a favourable environment for TC formation. The impact of SIOD is weaker in summer but a convergent zone with upwards motion also can be found over northeastern SCS. In addition, the SIOD and El Nino-Southern Oscillation are two primary impacting factors in winter and TC numbers increase when La Nina and positive SIOD events occur simultaneously. However, the SIOD is a dominant and independent impacting factor in summer and El Nino events just play a secondary role.
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