【摘要】 利用1961—2000年近40年印度洋海温距平场资料及对应的青藏高原35个观测站的降水与温度资料,通过相关普查得出,印度洋地区东西海温的偶极振荡与青藏高原汛期降水、温度有较好的相关关系,特别是前期1月、12月～2月的印度洋地区东西海温的偶极指数与青藏高原汛期(6～8月)降水和前一年6月的印度洋地区东西海温的偶极指数与青藏高原汛期(6～8月)温度有很好的相关。分析1961—2002年NCEP/NCAR500hPa北半球高度场资料发现,印度洋地区东西海温的偶极指数与欧亚500hPa的高度场异常有密切的关系,并通过印度西南季风的强弱,影响到青藏高原汛期降水和温度的变化。更多还原

【Abstract】 Based on the precipitation and temperature data of 35 stations over Qinghai-Xizang Plateau and anomalous field data of sea temperature over Indian Ocean in last 40 years, by correlation statistics, it is found that the dipole index of abnormal sea temperature over eastern/western Indian Ocean and the precipitation and temperature of flood period over Qinghai-Xizang Plateau has a better relation, especially the dipole index of sea temperature over eastern/western Indian Ocean in January, from December to February and the precipitation of flood period over Qinghai-Xizang Plateau, the dipole index of sea temperature over eastern/western Indian Ocean in last June and the temperature of flood period over Qinghai-Xizang Plateau has a very good correlation. By analyzing 500 hPa height field data in 1961₂002, it is found that the dipole index of sea temperature over eastern/western Indian Ocean has a close relation to the abnormal of Eurasia 500 hPa height field of Northern Hemisphere, which affects on the variation of precipitation and temperature of flood period over Qinghai-Xizang Plateau throush the strong and weak of Indian southwest monsoon.更多还原