赤道东太平洋海温异常期间印度洋偶极子对东亚季风区影响的数值模拟

NUMERICAL SIMULATION OF THE INDIAN OCEAN DIPOLE INFLUENCE ON CLIMATE VARIATIONS OVER EAST ASIAN MONSOON REGION DURING EQUATOR EAST PACIFIC SSTA

利用中科院大气所的IAP AGCM-Ⅱ大气环流模式,模拟了在存在和没有赤道东太平洋海温异常影响下,印度洋偶极子对东亚季风区天气气候的影响。结果表明:后者东亚地区西南季风的爆发偏晚,南海夏季风增强,此时我国大陆降水偏多;而前者西南季风的爆发将更偏晚,南海夏季风减弱,此时华北降水偏少;赤道东太平洋海温异常和印度洋偶极子有协同作用。

This paper analyses the Indian Ocean Dipole(IOD) influence on climate variations over East Asian monsoon region, based on CAS's IAP AGCM-Ⅱ with Equator East Pacific SSTA influence on or not. The results show that the South China Sea summer monsoon will break out later than usual, the intensity is stronger than usual, and more rainfall on Chinese main land is simulated only the IOD forces are considered. With both the IOD and Equator East Pacific SSTA forcing, the South China Sea summer monsoon will break out later than the latter, the intensity is weaker than usual, and less rainfall on the north of China is simulated. So Equator East Pacific SSTA and the IOD have synergic effect.