Abstract:

In order to learn about urban heat island phenomena and disciplinarian during the unusual drought period, the MODIS remote sensing data and temperature data measured in automatic weather stations, which distributed in the urban and suburb were used to investigate the relation of NDVI and urban heat island during the unusual drought in 2006 summer in Chongqing. The result showed that in 2006 summer, the NDVI decreased with time, which mainly was consistent with the change trend of drought in 2006 summer in Chongqing. In the whole period of drought, in the mass NDVI negatively correlate with the urban heat island, the higher the NDVI was, the feebler the urban heat island was. Because of non-synchronization of drought in urban and suburb areas, in the early period drought strengthened urban heat island and in the later period of drought, it weakened urban heat island. All in all, the appearance of drought aggravated the degree of urban heat island.