宁夏河东沙地近百年来气候背景变化分析

利用贺兰山树木年轮指数与河东沙地盐池代表站的年降水量及气温距平建立相关关系,对河东沙地近百年的降水量及气温距平序列进行拟合延长,分析河东沙地近百年来气候变化大趋势。同时利用河东沙地范围内6个代表性站气象资料,对近50年来河东沙地气候变化特征作较详细的分析。结果表明:河东沙地在30年代之前为干冷期;30年代以后逐渐向暖湿方向发展,一直持续到50年代中期;50年代中期以后是一个典型的寒冷湿润时期;60年代以后是一个相对干冷时期;80年代中期至今是近百年里的一个相对干暖时期。另外,在河东沙地不同时间、不同方位上气温、降水量、蒸发量、空气相对湿度及平均风速均存在着较大差异。

Analysis of Climate Background Change over Sandy Lands in Ningxia in 20th Century

The temperature,precipitation around last century retrieved by tree ring in the northern and middle parts of Ningxia were used to fit and prolong the series of precipitation and temperature anomaly in the sandy lands to the east of the yellow river and the climate tendency in the last century was analyzed.The climate features there were studied in detail using the meteorological data from six typical stations.The results show that it was cold and dry in the first three decades;then turned warm and wet till the mid of the 1950s.After the end of 1950s,there was a typical cold and wet period,and after the 1960s it was relatively cold and dry.Since the middle 1980s till now,it was relatively warm and dry.The temperature,precipitation,evaporation,relative humidity and average wind velocity varied in different places and different periods.