【摘要】 利用 1 873～ 1 995年的北半球海平面气压月平均资料 ,定义了北大西洋涛动指数。用近 4 5a资料研究了北大西洋涛动与我国冬、夏季气候变化的关系。指出 ,北大西洋涛动异常变化与我国冬、夏季天气气候关系密切。强涛动年 ,冬季我国是偏暖、多雨的气候特征 ;夏季我国江淮之间地区气温明显偏低。还表明 ,强涛动年冬季 ,西太平洋副热带高压强度与西伯利亚高压及高空经向环流都明显偏弱 ,大气环流具有弱WA遥相关型、弱的东亚冬季风特征 ,对应的夏季环流特征与强东亚夏季风特征较接近。更多还原

【Abstract】 By the use of 1873~1995 monthly mean Northern sea level pressure defined is the north Atlantic oscillation index( I NAO ). Studies of the relation of the winter I NAO to the climate of winter and summer over China by using the data for the last 45 years show that the winter I NAO anomaly bears a close relation to the mainland weather/climate of winter and summer.When a strong I NAO occurs China will experience an extensive high temperature and more rainfall in winter,and the summer temperature will be markedly lower in the band between the Yangtze and Huaihe River.Besides, the Northern surface and 500hPa winter and summer circulation features for the years of the strong and weak I NAO are studied and the results indicate that for strong I NAO years,the subtropical high and Siberian high as well as meridional circulation intensity in winter are greatly reduced in vigor with a weak WA teleconnection pattern and feeble east Asian winter monsoon.But the east Asian monsoon will be stronger in the following summer.更多还原