利用1971-2008年黄河孟兰段南北两岸10个气象站的月降水气象资料,对38年来两岸年、季平均降水进行时空分析,结果表明:①两岸年平均降水量都呈增多趋势,但存在南北差异,南岸降水明显多于北岸,但北岸较南岸增多幅度明显.②两岸春、冬季降水都呈增多趋势,北岸较南岸增多幅度明显.③两岸夏季降水呈增多趋势,南岸增多幅度明显高于北岸.④两岸秋季降水趋势与夏季相反,都呈减少趋势；南岸较北岸减少幅度明显.⑤两岸春、秋、冬季降水差异呈逐年代减小的趋势,夏季降水差异仍明显.%The monthly precipitation data of ten weather stations in northern and southern shores of the Meng-lan reach of the Yellow River from 1971 to 2008 has been used to analyse the annual and seasonal average precipitation in time and space. The results show that: ①The average precipitation in both sides are in increasing trend, but there are differences between north and south. The precipitation of southern shore is higher than the northern shore, but the increase rate of northern shore is higher than the southern shore.②The spring and winter precipitation of the both shores are in increasing trend, but the increase rate of northern shore is higher than the southern shore.③The summer precipitation of the both shores are in increasing trend, but the increase rate of southern shore is higher than the northern shore.④The autumn precipitation trend of the both shores is in contrast with the summer, which are in decreasing trend. And the decrease rate of southern shore is higher than the northern shore.⑤The spring, autumn, and winter precipitation differences in both shores are in decreasing trend, and the summer precipitation difference is obvious.
展开▼
