论城市热岛强度的表示方法

讨论了表示城市热岛的各种方法并进行了比较。

ON THE METHODS OF EXPRESSING THE URBAN HEAT-ISLAND INTENSITY

This paper first illutrates by examples that many researches of heat-island intensity lack comparability because there arc different sources of information and different methods of research. Next it discusses city influences on climate. and explains, from urban climatic point of view, differences among built-up area suburbs and rural area, and how to choese the representive observation sites of temperature in order to guarantee that temperature of observation can reflect the influence of city on climate.On this basis, the writer puts forward and recommend the following several methods of expressing urban heat-island tintensities.1. The observation sites should be well distrubited. to ues the difference between mean temperature of built-up area and rural area to express urban heat-island intensity.2. The observation sites should be distributed on different urban func-ional areas: to use the difference between weighted average of built-up area and rural area to express urban heat-island intensity,3. Determining urban heat-island intensity with regression analysis.4. Analysing urban heat-island intensity with statistical or theoretial analysis.5. Analysing urban heat-island intensity with remote sensing method.In the case of metropolis, if there are considerable differences between topography and natural landscape of built-up and rural area, it is nec-cessary to make temperature corrections with synthetic-seperate method according to the difference between topography and natural landscope of built-up and rural area before urban heat-island intensity is computed.