基于DEM的气温变化区域分异分析

Analysis of the Regional Discrepancy of Temperature Changes Based on DEM

针对气温变化分析中研究区存在复杂地形而引起的气温变化区域分异,利用湖北省76个气象台站1960—2005年月平均气温观察资料和DEM数据将研究区进行了划分,并对划分结果进行了气温变化区域特征对比分析。结果表明:利用台站监测数据得到的Kendall气温倾斜度与DEM中的高程有很好的相关性,利用这种关系进行分段线形拟合、DEM聚焦分析等处理,划分的山地区和平原区具有不同的气温变化规律。在不对研究区气温变化特征进行划分的情况下,湖北省的气温变化特征代表了省内平原区的变化特征,而掩盖了山地区的变化特征。当研究区地形复杂而产生明显的气温变化区域分异时,对研究区进行划分成为必要。

Complicated landforms in the study area may lead to regional discrepancy of temperature changes.Based on the monthly average temperature data of 76 meteorological stations in Hubei province from 1960 to 2005 and DEM data,this paper presents a method for subdividing the province into different regions and makes a comparative analysis of characteristics of temperature changes.The result shows that： there exists a good correlation between the Mann-Kendall slopes of temperature and the DEM elevation.By means of segmental linear fitting and DEM focal analysis,the mountain region and the plain region subdivided have different characters of temperature changes.Without subdividing the studied area,the characters of temperature changes in Hubei Province represent the characters of the plain region while covering up the characters of the mountain region.It is needed to subdivide the study area when the landform is complicated and regional discrepancy of temperature changes is apparent.