全球海温异常作用下的低层大气环流和降水异常的数值模拟

通过在ＩＡＰＡＧＣＭ中加进太平洋和印度洋海温异常的数值模拟，证实了实况月平均８５０ｈＰａ上的异常环流特征：ＥｌＮｉｎｏ海温位相时低纬太平洋低层大气出现异常的西风气流以及在东南亚沿海出现向赤道的异常气流；而在ＬａＮｉｎａ位相时，低纬太平洋低层大气出现异常的东风气流和在东南亚沿海出现离赤道的异常气流。若在模式中仅引入太平洋的海温异常或在模式中去掉地形以后，模拟的低纬低层异常气流与上述结果有所不同。用该模式还模拟出了与观测相符的低纬地区降水的异常

A NUMERICAL SIMULATION OF THE EFFECT OF GLOBAL SST DEPARTURE ON LOW-LEVER ATMOSPHERIC CIRCULATION AND PRECIPITATION ANOMALIES

Introducing SST departure of the Pacific Ocean and the Indian Ocean during El Nio or La Nia episode into IAP AGCM,the monthly mean circulation anomaly which is similar to observation on the 850hPa has been simulated.The results show that westerly (easterly) anomalous flow appears on the low latitude Pacific and the anomalous folw toward Equator (Polar) appears on Southeast Asia Sea during the El Nio (La Nia) episode.If only introducing SST departure of the Pacific Ocean into IAP AGCM or the topographies drop from the AGCM,the anomalous flow by simulated is not same with above.The precipitation anomalies over low latitude have been simulated and compared with observations also.