基于DTR的中国东部沿海地区城市热岛强度定量估算

Assessment of urban heat island intensity in China's eastern coastal region based on diurnal temperature range

为解决城市热岛效应研究中热岛强度定量计算的难点问题,将气象学上的温度日较差(diurnal temperature range,DTR)概念引入遥感城市热岛强度定量评估中,通过对热红外影像的日夜温度差计算,得到基于遥感的DTRMODIS.结果显示:DTRMODIS从2001年的10.61℃减小至2013年的9.47℃,12年间缩减了1.14℃,表明中国东部沿海地区热岛强度不断增加.同时,利用基于气象站气温数据的DTRWS对DTRMODIS进行回归分析,揭示二者之间具有较显著的相关性,证明利用遥感热红外影像估算研究区DTR的可行性.

The quantitative measurement of urban heat island intensity( UHII) has not been clearly addressed in urban heat island( UHI) study. We introduced the concept of meteorological diurnal temperature range( DTR) to quantitatively assess urban heat island intensity. Remote sensing based on DTRMODIS was achieved by calculating the temperature difference between day and night from thermal infrared images. The result shows that the DTRMODIS decreased from 10. 61 ℃ in 2001 to 9. 47 ℃ in2013,a net decrease of 1.14 ℃ during the 12 study years. This result demonstrates that the UHII of eastern coastal China has been intensified. The regression analysis was made between DTR derived from meteorological data and DTRMODIS and revealed the significant relationship between the two DTRs.The result provides the feasibility of using remote sensing thermal infrared images to estimate DTR.