关键词: 城市热岛

Abstract: 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 funcional 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 neccessary 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.

Key words: Heatisland