摘要
用 1 950～ 2 0 0 0年我国 6 2 9个站逐月降水资料 ,采用Z指数作为旱涝等级划分标准 ,把各地的旱涝情况划分成 7个等级 ,把长江以北主要农业区格点化后 ,以各格点中达到干旱站点的多少为权重 ,求出格点中干旱发生的面积。通过对 51年的资料分析 ,发现我国北方区干旱面积在不同月份有其不同的变化特征。其中 1、2、4、7、8、9、1 1、1 2月八个月的干旱面积有不断扩大的趋势 ,3、5、1 0三个月的干旱面积处于平均状态 ,6月份的干旱面积有减少的趋势。
Based on the monthly rainfall data of 629 stations from 1950 to 2000, using Z index as the standard division of the drought/wetness of seven classes (grades) are made. After squaring mainly agricultural areas in the north of the Changjiang River, the square measure of drought has happened by calculating how much proportion the drought station held each square. The results indicated that the drought areas with constantly extensive tendency are in Jan., Feb., Apr., Jul., Aug., Sep., Nov. and Dec. but declined in June.
出处
《气象》
CSCD
北大核心
2005年第1期37-40,共4页
Meteorological Monthly
