Impacts of the variations in the intensity of the northern Pacific subtropical ocean circulation on the rainfalls over the middle and lower reaches of the Changjiang River

JIN Qihua; WANG Hui; JIANG Hua; HE Chun; LIU Shan

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JIN Qihua, WANG Hui, JIANG Hua, HE Chun, LIU Shan. Impacts of the variations in the intensity of the northern Pacific subtropical ocean circulation on the rainfalls over the middle and lower reaches of the Changjiang River[J]. Haiyang Xuebao, 2012, 34(1): 64-70.

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Impacts of the variations in the intensity of the northern Pacific subtropical ocean circulation on the rainfalls over the middle and lower reaches of the Changjiang River

1.
Chinese Academy of Meteorological Sciences, Beijing 100081, China
2.
National Marine Environmental Forecasting Center, Beijing 100081, China
3.
Chinese Meterological Administration, Beijing 100081, China

Received Date: 2010-08-31
Rev Recd Date: 2011-01-20

Abstract

Abstract

The impact of variability in the strength of the subtropical circulation in the North Pacific Ocean on the summer precipitation over the eastern China is investigated.The intensity of subtropical circulation in the North Pacific is diagnosed from SODA and ECCO dataset; the atmospheric circulation and the sea surface temperature (SST) are diagnosed from the NCEP/NCAR reanalysis dataset and the Hadley SST; the precipitation data is based on the monthly rainfall observations over 160 stations in China.This study is focused on the interaction between the atmospheric and oceanic circulations over the periods of 1970-2009.The results show that there exists a strong negative correlation between the variability of the sutropical circulatioin and the summer rainfall in the middle and lower reaches of the Changjiang River. When the subtropical gyre is relatively weaker (stronger) than normal, the subtropical high is located further south (north) than normal; an abnormal cyclonic (anticyclonic) circulation prevails over the Changjiang River basin, companied by the vigorous (weak) southwestern moisture transporting here to form a strong moisture convergence (divergence) center.This gives rise to an ascending vertical motion and at the same time the convection is strengthened (weakened).As a result, a very favorable large-scale circulation is established, which can sustain the heavy (weak) rainfalls in the middle and lower reaches of the Changjiang River.Furthermore, the variation in the subtropical wind-driven gyre can generate SST anomaly at middle latitudes, which may be the primarily reason for meridional shifting of the subtropical high in the North Pacific Ocean.

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