Indo-Pacific remote forcing in summer rainfall variability over the South China Sea
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AbstractThis study investigates summer rainfall variability in the South China Sea (SCS) region and the roles of remote sea surface temperature (SST) forcing in the tropical Indian and Pacific Ocean regions. The SCS summer rainfall displays a positive and negative relationship with simultaneous SST in the equatorial central Pacific (ECP) and the North Indian Ocean (NIO), respectively. Positive ECP SST anomalies induce an anomalous low-level cyclone over the SCS-western North Pacific as a Rossby-wave type response, leading to above-normal precipitation over northern SCS. Negative NIO SST anomalies contribute to anomalous cyclonic winds over the western North Pacific by an anomalous east-west vertical circulation north of the equator, favoring more rainfall over northern SCS. These NIO SST anomalies are closely related to preceding La Niña and El Niño events through the "atmospheric bridge". Thus, the NIO SST anomalies serve as a medium for an indirect impact of preceding ECP SST anomalies on the SCS summer rainfall variability. The ECP SST influence is identified to be dominant after 1990 and the NIO SST impact is relatively more important during 1980s. These Indo-Pacific SST effects are further investigated by conducting numerical experiments with an atmospheric general circulation model. The consistency between the numerical experiments and the observations enhances the credibility of the Indo-Pacific SST influence on the SCS summer rainfall variability. © 2014 Springer-Verlag Berlin Heidelberg.
All Author(s) ListHe Z., Wu R.
Journal nameClimate Dynamics
Year2014
Month1
Day1
Volume Number42
Issue Number9-10
PublisherSpringer Verlag
Place of PublicationGermany
Pages2323 - 2337
ISSN0930-7575
eISSN1432-0894
LanguagesEnglish-United Kingdom
KeywordsEquatorial central Pacific SST, Indirect influence of Pacific SST, North Indian Ocean SST, Numerical experiments, South China Sea summer rainfall

Last updated on 2021-10-09 at 23:42