The Synergy between the East Asian Summer Monsoon and the South Asian Summer Monsoon and Its Relations with Anomalous Rainfall in Southern China

HUAN Yu; LI Yueqing

doi:10.7522/j.issn.1000-0534.2018.00044

Plateau Meteorology ›› 2018, Vol. 37 ›› Issue (6) : 1563-1577. DOI: 10.7522/j.issn.1000-0534.2018.00044

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Using the precipitation data in China and the reanalysis data from European Centre for Medium-Range Weather Forecasts (ECMWF) during the period of 1979-2014, the index for the interface between the East Asian summer monsoon and the Indian summer monsoon (ⅡEI) was calculated, and the interannual variation of ⅡEI, the feature of its positive-anomaly and negative-anomaly years, as well as the relations between ⅡEI and China's regional precipitation were also analyzed on the basis of the comparison of ⅡEI and the indices of East Asian summer monsoon and the Indian summer monsoon by Empirical Orthogonal Function (EOF), correlation analysis, wavelet analysis, composite analysis and differential analysis. The results showed that the ⅡEI has positive correlation with the index of East Asian summer monsoon and negative correlation with the Indian summer monsoon. Meanwhile, there are negative correlation between ⅡEI and precipitation in most of the southern China. In the positive-anomaly years of ⅡEI, the East Asian summer monsoon is stronger than Indian summer monsoon, the intensity of South Asian high is weaker and its position is both by south and by west, and the intensity of West Pacific subtropical high is weaker and the location is both by east and by north. The south China is controlled by the northeastern winds. And it is the northerly wind at the low level of the South China Sea that inhibits the transport of water vapor to the southern China. The sinking movement results in the less precipitation in most southern China and causes drought easily. In negative-anomaly years of ⅡEI, the East Asian monsoon is weaker than the South Asian monsoon. The intensity of South Asian high is stronger and its position is by east, and the strength of the West Pacific subtropical high is stronger and its position is both by west and by south. The southern China is controlled by the southwest wind. And it is the southerly wind at the low level of the South China Sea that transports the water vapor from the Arabian Sea and the Bay of Bengal to the vast areas of the southern China, and meets with the dry-cool airflow from the north. Because of the anomalous upward movement, it brings much more precipitation to the southern China and cause floods easily. Therefore, the synergistic evolution of the East Asian monsoon and the South Asian monsoon is the important reason for the anomalous precipitation in the southern China.

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East Asian summer mo / South Asian summer m / synergy / the southern China / precipitation anomal

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HUAN Yu , LI Yueqing. The Synergy between the East Asian Summer Monsoon and the South Asian Summer Monsoon and Its Relations with Anomalous Rainfall in Southern China. Plateau Meteorology. 2018, 37(6): 1563-1577 https://doi.org/10.7522/j.issn.1000-0534.2018.00044

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