基于MODIS的我国地级市地表城市热岛强度评估

Evaluation on the Surface Urban Heat Island Intensity in Chinese Prefecture-Level Cities Based on MODIS

随着城市化进程的不断加快,城市热岛现象被认为是最严重的城市生态问题之一,完善对愈发严重的热岛现象的理解已成为当务之急。本研究基于MODIS遥感影像,以我国地级市为研究对象,识别出全国尺度的地表城市热岛发展现状,并对比不同气候区的地表城市热岛强度分析其潜在原因。结果表明我国全国范围存在着严重的热岛现象,而城市冷岛主要出现在西北干旱地区。不同气候区的地表城市热岛也存在显著差异性,其中中亚热带气候区的平均地表城市热岛强度最高,温带气候区的地表城市热岛强度最低。本研究完善了现有研究对于我国地表城市热岛及其空间格局的理解,并可为未来不同区域热岛效应的缓解提供参考。

With the acceleration of the urbanization process,the urban heat island(UHI)effect is considered as one of the most serious urban ecological problems.Therefore,supplementing the existing understanding on the increasingly severe UHI effect has become an urgent task.Based on MODIS remote sensing images,all prefecture-level cities in China were used to identify the development status of surface urban heat island at a national scale.Then the paper compares the surface urban heat island in different climatic zones and analyzes the underlying reasons.The results show that the whole China is experiencing a serious nationwide heat island phenomenon.In contrast,the urban cold islands mainly occur in arid areas of northwest China.There are significant differences in surface urban heat island for different climatic zones.Specifically,the average surface urban heat island in the Middle tropical zone is the highest,while the lowest surface urban heat island occurs in the Temperate zone.This study complements the existing understanding of the spatial pattern of UHI in China,which could provide a reference for the mitigation of urban heat island in different regions.