【作者】 刘继韩； 丛树平； 刘莉；

【Author】 LIU JIHAN;CONG SHUPING;LIU LI;THE DEPARTMENT OF GEOGRAPHY,PEKING UNIVERSITY;

【机构】 北京大学城市与环境学系；

【摘要】 用NOAA的AVHRR影像进行城市热岛动态监测具有时相多、测点资料有广延性且较易获得等优点。本文在对AVHRR影像资料进行一系列处理的基础上,分析北京城郊气象站的气温、地面温度与气象站所在像元的亮温发现,它们之间有较好的线性关系,尤以气温与亮温的关系为佳。在此基础上,用亮温换算出来的气温研究北京四季城市热岛的特征能较好地反映城市热岛的动态变化。更多还原

【Abstract】 In this paper,authors had studied the characteristics the heat-island in Beijing using cloudless NOAA-AVHRR data(mainly channel,2,4) received from different time of 1988.The data were processed in DIPIX image processing system.The research consisted of two steps:1.Regression analysis of brightness temperature and the simutaneously observed surface temperature and air temperature at different stations.The analysis shows that strong correlation exists there especially between brightness temperature and air temperature.A station-averaging relation was constructed.2.Simulation of the heat-island of cloudless in Beijing.Authors come to the following conclusions:(1) The intensity of heatisland reaches its maximum at early afternoon of Summer or Autumn and its minimum in the morning of Winter or Spring.(2) The difference of intensity of heat-island between different seasons are greater in early afternoon than that in the morning.(3)A weak-wind condition enhances the intensity and give a similar outline with the built-up areas,and a cold-island can be formed in a windy winter day.(4) The energy-consuming industrial zones and the crowded downtown area come to be hightemperature centers while the water bodies often a low temperature zones,更多还原