基于地理信息的河南省3～4月降水时空分布及变化

Temporal-Spatial Distribution Analysis of Precipitation in Mar.and Apr.in Henan Area Supported by Geographic Information System

基于地理信息系统和河南省1971～2000年30年的气候资料,分析河南全省3～4月降水的时空分布及变化趋势。结果表明,河南省春季降水分布按纬度由南向北逐渐减少。河南全省3～4月总的降水量为减少趋势,其中,豫南减少最为严重,豫中次之,豫北最少。河南全省3月的降水量大部分地区处于历史平衡范围,只在豫南的少部分地区存在3月降水偏多的趋势。河南全省4月的降水量趋势分布变化较大,豫北部分地区基本维持在历史常年范围之内,豫中的大部分地区降水处于减少趋势,豫南的部分地区4月份降水严重减少。

The trend and temporal-spatial distribution of precipitation were analyzed in Mar. and Apr. in Henan area based on Geographic Information System and the 30 a climate data. The results showed that the precipitation in Mar. and Apr. was gradually reduced from South to North in Henan area. The trend of precipitation in Mar. and Apr. was gradually decreased from 1970s＇ to 2000s＇. The south Henan was more serious than other parts. There was no obvious change in Mar. while the trend of precipitation in Apr. was obvious. The trend of precipitation in north Henan kept invariant, and the precipitation in south Henan had a striking decreasing.