基于MODIS数据的中国热环境时空变化研究

以2011年1、4、7、10月份的MODIS陆地表面温度产品(MOD11A2)、地表覆盖类型产品(MOD12Q1)为依据,采用GIS的空间分析,方差分析和统计分析方法,研究了中国陆地表面温度(LST)的季节变化规律,以及LST与不同下垫面类型之间的相互关系。结果表明:(1)冬季,整个区域昼夜呈现出陆地表面温度随纬度递减而逐渐上升的趋势;夏季白天,北方大部分地区陆地表面温度要比东南沿海地区高,晚上,则相反。(2)不同下垫面类型对陆地表面温度的影响较为显著,整体表现为,白天,林地、草地、水体、耕地、未利用土地、建设用地的陆地表面温度依次升高;黑夜,水体、林地、草地、耕地、建设用地、未利用土地的陆地表面温度依次降低。这种变化趋势和下垫面类型的热容量性质具有密切的关系。

Spatio-temporal thermal environment in China based on MODIS data

By using the materials of the MODIS surficial temperature in January,April,July and October in 2011(MOD11A2) and the materials of surficial coverage type(MOD12Q1),applying the spatial analysis techniques,variance analysis and statistical analysis technique,we studied the seasonal regularities of LST and the interrelationship between LST and different underlying surface.The results are as follows: Firstly,throughout the region,the LST showed gradually rising trend with the latitude decreasing during day and night in winter;During the day in summer,the LST in most northern parts was higher than the southeast coastal areas,at night,it showed the opposite characteristics;secondly,the different type of underlying surface had a great influence on the land surface temperature: during the day,the land surface temperatures of forest land,grassland,water,and cultivated land and unused land,construction land increased orderly;at night,the land surface temperatures of water,forestland,grassland,cultivated land,construction land and unused land decreased orderly.This trend had a close relationship with the nature of the heat capacity of the surface types.