基于GIS的邯郸市干热风时空变化特征分析

Analysis of Spatial-Temporal Change Characteristics of Dry-Hot Wind for Winter Wheat in Handan Based on GIS

利用1971～2010年邯郸地区16个气象台站的日最高气温、14:00时空气相对湿度和14:00时风速的观测资料,研究了邯郸市干热风发生日数和干热风天气过程发生次数的时间和空间分布特征,并利用Morlet小波分析方法探讨了邯郸干热风发生日数的周期性。结果表明:邯郸市轻度、重度干热风的年平均发生日数分别为2.6 d和1.4 d,在空间分布上自西北到东南逐渐减少;轻度、重度干热风天气过程的年平均发生次数分别为0.9次和0.5次;从1971年至2010年,轻度和重度干热风发生日数的年际变化很明显,均呈先减少后增多的变化趋势;轻度干热风年平均发生日数的变化存在3.5年和2.0年的周期,重度干热风年平均发生日数的变化存在3.0年和2.0年的周期。

By using the observation data of daily maximum air temperature,air relative humidity at 14:00,and wind speed at 14:00 from 1971 to 2010 provided by 16 meteorological stations in Handan area,we studied the spatial and temporal distribution characteristics of the day number of dry-hot wind occurrence and the times of dry-hot wind weather process occurrence for winter wheat in Handan city,and explored the periodicity of the day number of dry-hot wind occurrence in this city by using Morlet wavelet analysis method.The results showed that the annual average day number of light and heavy dry-hot wind occurrence in Handan was 2.6 d and 1.4 d,respectively,and it gradually decreased from the northwestern part to the southeastern part.The annual average occurrence times of light and heavy dry-hot wind weather process was 0.9 and 0.5,respectively.From 1971 to 2010,the inter-annual variations in day number of light and heavy dry-hot wind occurrence were very obvious,and all revealed the trend of decreasing first and then increasing.The changes in annual average day number of light dry-hot wind occurrence had the periodicity of 3.5 years and 2.0 years,while the changes in annual average day number of heavy dry-hot wind occurrence had the periodicity of 3.0 years and 2.0 years.