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Southeastern China Boreal Winter Precipitation Anomalies are Dependent on Intensity of El Nino.


ABSTRACT: Previous studies reported that boreal winter precipitation in southeastern China (SEC) tends to increase during El Niño. In this study, however, we find that most weak El Niño events are accompanied by below-normal precipitation in SEC, although strong El Niño events are accompanied by above-normal precipitation in SEC for both eastern Pacific El Niño and central Pacific El Niño. Both the cold SST anomalies in the western North Pacific (WNP) and the warm SST anomalies in the central tropical Pacific are important for the formation of anomalous anticyclone over the WNP, which favors above-normal precipitation over SEC by transporting more water vapor to SEC. The cold SST anomalies in the WNP only excite a weak anomalous anticyclone locally when the weak warm SST anomalies in the central tropical Pacific are accompanied by weak enhanced convection anomalies. In such condition, El Niño does not affect precipitation in SEC apparently.

SUBMITTER: Ke Z 

PROVIDER: S-EPMC6874680 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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Southeastern China Boreal Winter Precipitation Anomalies are Dependent on Intensity of El Niño.

Ke Zongjian Z   Jiang Xingwen X   Wang Zunya Z  

Scientific reports 20191122 1


Previous studies reported that boreal winter precipitation in southeastern China (SEC) tends to increase during El Niño. In this study, however, we find that most weak El Niño events are accompanied by below-normal precipitation in SEC, although strong El Niño events are accompanied by above-normal precipitation in SEC for both eastern Pacific El Niño and central Pacific El Niño. Both the cold SST anomalies in the western North Pacific (WNP) and the warm SST anomalies in the central tropical Pac  ...[more]

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