A Simulation on the Response of the Climate of China to the SST Anomaly in the North Pacific

By utilizing the result simulated by GCM of Meteorological Institute of Hamburg University, the response of the model climate of China to the SST anomaly in the North Pacific is analysed in order to understand the cause of formation of climate in China. The sensibility experiment consists of anomaly run simulated by superposing an anomaly called the “east warming and west cooling” pattern to the multiyear mean SST field and control run simulated by without the anomaly. The experimental result point out that the two branches of jet around the Qinghai-Xizang Plateau at 300 hPa in January greatly increases its intensity and the Hadley circulation weakens. Consequently, the at 500 hPa and the temperature pattern at 850 hPa resembles the winter pattern, i.e., the meridional circulation and the north to south temperature gradient are strong accompanying with decreasing of the temperature over most parts of China in January. Nevertheless merely weak response of the humidity field to the SST anomaly in the North Pacific is found, it is in agreement with the usual view that the drought in China in winter is caused by frequent invasion of the dry cold anticyclone from Mongolia