【摘要】 利用1951-2006年中国区域160个站的月降水及月平均气温资料,对中国区域近56a气候要素的变化及其与干旱化联系的事实进行了分析。结果表明:降水减少的地区主要位于我国北方的西北东部、华北及东北;在南方,西南的降水减少趋势与上述地区具有类似特征。气温基本为增温趋势,而西北东部及西南地区气温也在20世纪80年代发生转折性变化,由80年代中期以前的降温趋势转为其后的增温趋势。地表湿润指数分析的结果指出:我国西北东部、华北、东北及西南地区当前正处于一个干旱化过程,但不同地区干湿变化特征及干旱化的持续时间和位相却有差别。更多还原

【Abstract】 Basedon the monthly mean surface air temperature (SAT) and monthly precipitationof 160 meteorological stations over China from 1951 to 2006, the relationship between climate change and drying trend was analyzed in the last 56 years. The results indicated that the annual precipitation reduced in North China, Northeast China, the east part of Northwest China, and Southwest China, while the SAT generally increased in these regions. It is worth noting that the trend of SAT turned from a decreasing trend to an increasing trend in Southwest China and the east part of Northwest China in the 1980s. Analysis of surface wetness index (SWI) shows there were drying trends in North China, Northeast China, Southwest China and the east part of Northwest China, but the phase and duration of the drying processes were different in the above mentioned regions.更多还原