近50年冬季中蒙500 hPa高度场与中国北方地面气温的变化及联系

通过对冬季中蒙地区500hPa高度场与我国160个测站月平均地面气温场的分析，对51年来中国北方冬季气温出现年代际变暖趋势的原因进行了探讨。结果表明：1951—2001年期间，蒙古及中国北方地区冬季气温出现明显的正趋势变化；中蒙地区500hPa高度的正趋势变化对应中高纬度强的纬向环流、弱的经向环流，以及弱的冷空气；中蒙地区的正趋势变化与中国北方地区冬季气候变化有较好的关系。

The Variation and Relation of 500 hPa Height Field in China-Mongolia and Surface Temperature of North China in Winter in Recent 50 Years

By analyzing the variations of 500 hPa height field and monthly mean surface air temperature of 160 stations in China, the reasons that winter surface air temperature appearing interdecadal change in North China are discussed. The results are as following: a) It is shown that the temperature in North China had positive trend and interdecadal change in winter. b) The positive trend of height of China and Mongolia was corresponding to the strong zonal circulation, weak meridional circulation and weak cold air activities; c) It is shown that the winter temperature in North China during the period of the past 51 years were closely related to the positive trend of 500 hPa height field in China and Mongolia.