华北地区夏季水量丰、枯年大气水分收支对比分析

利用NCEP／NCAR的40年再分析资料，初步对比分析了华北地区夏季水量丰、枯年大气水分循环的差异，结果发现，干旱年自然表经蒸发过程进入大气的水分少于湿润年；华北全区平均夏季垣年略有水汽亏损，湿润年略有盈余；干旱年对流层呼层由西南气流带来的水汽明显少于湿润年，由东边界和北边界流出的水汽也明显不和于湿润年；干旱年对流层各层大气湿度都小于湿润年；水量丰、枯年对流层各层水汽均以辐合为主，但干旱年福合量小于湿润年。

Contrasting Analysis of the Atmosphere Hydrological Cycle of Drought and Rainy Years in Summer over North China

Based on 40 years' reanalysis data of NCEP/NCAR, the difference of atmosphere hydrological cycle was analyzed between drought and rainy years in summer over North China. The results showed that the water vapor of drought year entering into atmosphere from the earth's surface was less than that of rainy year. The water vapor was deficit in drought year and surplus in rainy year in summer over North China. The water vapor brought by SW air current in the drought year on each level of troposphere was less than that in the rainy year. And the effusive water vapor from the east and north verges in the drought year was also less than that of the rainy year. There was a water vapor convergence in both drought and rainy years on each level of troposphere, but it is less in drought year than in rainy year.