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Guangliang Li, Licheng Feng, Wei Zhuang, Fei Liu, Ronghua Zhang, Cuijuan Sui. Differences in Spring Precipitation over Southern China associated with Multiyear La Niña Events[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2147-0
Citation: Guangliang Li, Licheng Feng, Wei Zhuang, Fei Liu, Ronghua Zhang, Cuijuan Sui. Differences in Spring Precipitation over Southern China associated with Multiyear La Niña Events[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-023-2147-0

Differences in Spring Precipitation over Southern China associated with Multiyear La Niña Events

doi: 10.1007/s13131-023-2147-0
Funds:  The Natural Science Foundation of China under contract Nos 41976221, 42030410 and 41576029; the National Key Research and Development Program of China under contract No. 2019YFA0606702; the Startup Foundation for Introducing Talent of NUIST
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  • Corresponding author: fenglich@nmefc.cn
  • Received Date: 2022-12-27
  • Accepted Date: 2023-01-25
  • Available Online: 2023-04-12
  • Composite analyses were performed in this study to reveal the differences in spring precipitation over southern China during multiyear La Niña events from 1901-2015. It was found that there is significantly below normal precipitation in the first boreal spring, but above normal in the second year. The differences in spring precipitation over southern China are correlative to the changes in anomalous atmospheric circulations over the northwest Pacific, which can in turn be attributed to different anomalous sea surface temperatures (SSTs) over the tropical Pacific. During multiyear La Niña events, anomalous SSTs were stronger in the first spring than those in the second spring. As a result, the intensity of abnormal cyclones (WNPC) in the western North Pacific Ocean (WNP) in the first year is stronger, which is more likely to reduce moisture transport, leading to prolonged precipitation deficits over southern China. In contrast, the tropical SST signal is too weak to induce appreciable changes in the WNPC and precipitation over South China in the second year. The difference in SST signals in two consecutive springs leads to different spatial patterns of precipitation in southern China by causing different WNPC.
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