利用英国CRU资料重建华北地区百年蒸发量及变化分析

Evaporation plays an important role not only in water balance on the land surface but also in climate change. In the North China, the evaporation series of the recent 102 years (1901~2002) are reconstructed based on Gao’s evaporation formula, using CRU monthly mean air temperature and monthly precipitation data of UK. The results calculated by using CRU data agree well with that by observation data and reveal that the reconstructed series are credible. The analysis on reconstructed series show that evaporation has about 20-year cycle and the trend decreases during the past 102-year.