近20年全球冬、夏季海平面气压场和500 hPa高度场年代际变化特征分析

利用1958－1997年全球海平面气压场和500hPa高度场的月平均资料分析了70年代中后期年代际突变前后16a平均的冬、夏海平面气压场和500hPa高度场的变化特征。结果表明，发生在70年代中后期的年代际气候突变是全球性的；突变后与突变前相比，冬季海平面气压场上的阿留申低压增强并发生了东移，与之对应的冬季500hPa高度场上的东亚大槽减弱，同时也发生了明显的系统性东移；冬季，蒙古高压北部减弱，南部稍有增强；夏季，印度低压和东亚的季风低压均减弱；而副热带高压系统普遍增强。

Analyses on Interdecadal Change Characteristics of Global Winter and Summer Sea Surface Pressure Field and 500 hPa Height Field in Recent Twenty Years

The change characteristics of global monthly mean surface pressure field and 500 hPa height field in winter and summer before and after the abrupt change of climate in late 1970s were analyzed. The results indicate that the interdecadal abrupt change of climate is significant and global. Comparing after and before the abrupt change, it found that Aleutian low strengthens, with obvious east-moving in winter. Meanwhile East Asian major trough weakens and there is obvious systematically east-moveing too. The north of Siberian high becomes weak and the south of it strengthens in winter. Indian low and monsoon low of East Asia have the obvious weakness in summer and subtropical high system generally strengthens.