2007•Arid Zone ResearchRequires access
Application of MODIS Thermal Infrared Data in Researching Urban Heat Island in Urumqi
Gong Lu
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Abstract
Urban heat island is the most prominent characteristic of temperature affected by human activities,it has attracted the extensive interests all over the world because of its effect on global warming,and therefore it automatically leads to an academic craze in researching climate,ecology and environment.With the acceleration of urbanization,urban heat island results gradually the shortage of water resources in arid areas.The present situation in Urumqi City is that there is a severe restriction in urban development and threatening of residents' health.Land surface temperature(LST) is one of the most important parameters in researching urban heat island(UHI).In this study,the data of land surface temperature are derived based on split-window algorithm using thermal infrared bands of MODIS data.Moreover,the spatial macro-distribution of land surface temperature in the study area is analyzed,and the temporal characteristics of urban heat island effect in the daytime,at night and in different seasons are compared.The results reveal that there is a remarkable urban heat island effect in Urumqi.The spatial characteristics of land surface temperature show that there is a close correlation between the urban heat island effect and the types and functions of underlaying surface,and the high-temperature regions accord with the urban areas with busy traffic.The temporal characteristics of land surface temperature show that the underlaying surface in arid suburbs is mainly the deserts,and the temperature is high in the daytime.Therefore the urban heat island effect is not so significant in the daytime and even an urban cold island occurs sometimes.The urban heat island effect in Urumqi is significant only in the daytime in summer and at night all the year round.The maximum intensity of urban heat island occurs at night in summer.The temperature differences are 4~6 ℃ between the urban area and the near suburbs and 8~10 ℃ between the urban area and the far suburbs.