This research is jointly supported by the National Key Basic Research Program of China (Grant 2009CB421404), the National Natural Science Foundation of China (Grants 41175076, 40730951, and 412111046), and the Fundamental Research Funds for the Central Universities (Grant 11lgjc10). We thank Hainan Meteorology Bureau for providing rain gauge data. RW acknowledges the support of a Direct Grant of the Chinese University of Hong Kong (2021105), a Hong Kong Research Grants Council grant (CUHK403612), and National Natural Science Foundation of China grants (412750851 and 41228006).
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