Main Modes in East Asian Monsoon Circulation Evolution and Its Relationship with Precipitation Anomaly in Eastern China

HAO Li-Sheng--;DING Yi-Hui-;MIN Jin-Zhong-

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Plateau Meteorology ›› 2012, Vol. 31 ›› Issue (4) : 1007-1018.
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Main Modes in East Asian Monsoon Circulation Evolution and Its Relationship with Precipitation Anomaly in Eastern China

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Abstract

Based on the reanalysis circulation data from American National Centers for Environment Prediction/National Center for Atmospheric Research (NCEP/NCAR), the surface sea temperature (SST) data reconstructed by American National Oceanic and Atmospheric Administration (NOAA) and precipitation data at 752 stations from Chian National Meteorogical Information Center (NMIC), the seasonal evolution of main modes in East Asian monsoon and their relationship with the precipitation anomaly in eastern China are analyzed. The results show that there are two main modes in the East Asia monsoon seasonal evolution on 850 hPa. The first mode is mainly affected by Indian Ocean Dipole (IOD) evolution control under the low SST in tropical Indian Ocean and the equatorial eastern Pacific; the second mode is mainly affected by the equatorial eastern Pacific El Nio/Southern Oscillation (ENSO) cycle and IOD evolution control. Corresponding to the first mode, there is rainy in North China in summer, dry in the Yangtze River. Corresponding to the second mode, there is more rain in North China and the Yangtze River in summer, drier than usual in the Huaihe River and South China. The two modes have taken place significant change in recent 50 years, being a good relationship with the precipitation anomaly.

Key words

East Asian monsoon / Seasonal evolution / Main mode / Precipitation anomal

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HAO Li-Sheng-- , DING Yi-Hui- , MIN Jin-Zhong-. Main Modes in East Asian Monsoon Circulation Evolution and Its Relationship with Precipitation Anomaly in Eastern China. Plateau Meteorology. 2012, 31(4): 1007-1018

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