基于MODIS数据的云贵高原地表温度时空特征分析

Spatio-temporal characteristics analysis of land surface temperature on Yunnan-Guizhou Plateau based on MODIS data

基于2000-2019年MODIS地表温度产品及土地利用数据,采用定性和定量分析手段,对云贵高原地表温度时空特征进行分析。结果表明:2000-2019年云贵高原地表温度的变化趋势与全球气候变暖趋势相吻合,年际变化总体呈增长趋势,但变化率较小,仅为0.015℃·a-1,地表增温幅度不明显;地表温度的空间分布存在明显差异,总体呈现由低纬度区域向高纬度区域逐渐减少的趋势,并与山脉走势相对一致;随着海拔的升高,地表温度逐渐降低,且夜晚降低幅度较白天明显,昼夜温差呈现先增加后降低的趋势;地表温度季节性差异明显,春季白天平均地表温度最高,地表温度昼夜温差也最大。归一化植被指数能较好的反映人类活动不断改变地表物质组成对地表温度的影响。

Based on MODIS data and land use data from 2000 to 2019,the temporal-spatial characteristics of land surface temperature on the Yunnan-Guizhou Plateau were analyzed qualitatively and quantitatively.The results showed that the variation trend of land surface temperature on the Yunnan-Guizhou Plateau from 2000 to 2019 was consistent with the trend of global warming.The overall interannual variation showed an increasing trend,but the variation range was only 0.015℃/a.The spatial distribution of land surface temperature varied obviously,showing a trend of gradual decrease from the southern low-latitude region to the northern high-latitude region,which is relatively consistent with the trend of the mountain range.With the increase of the altitude,the land surface temperature gradually decreased,and the decrease at night was more obvious than that during the day.The overall temperature difference between day and night presented a trend of first increasing and then decreasing.The seasonal difference of land surface temperature was obvious:in spring the average land surface temperature was the highest,and the temperature difference between day and night was the largest.The normalized difference vegetation index(NDVI)could well reflect the influence of the constant change of land surface material composition due to human activities on the land surface temperature.