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.

• 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。