上海城市热岛的小波特征  

WAVELET CHARACTERISTICS OF URBAN HEAT ISLAND IN SHANGHAI CITY

作　　者：江田汉[1] 束炯[2] 邓莲堂 

机构地区：[1]北京大学环境科学系,北京100871 [2]华东师范大学地理系教育部城市环境动态过程开放实验室,上海200062 [3]国家气象中心,北京100081

出　　处：《热带气象学报》2004年第5期515-522,共8页Journal of Tropical Meteorology

基　　金：国家自然科学基金资助项目(49671069)资助

摘　　要：为研究城市热岛的时间尺度结构及其变化特征,利用Morlet小波变换对上海1999年冬、夏两季的城市热岛记录进行分析和计算,结果表明:(1)上海城市热岛明显呈多时间尺度结构,是由各种尺度的热岛叠加而成。冬季的热岛尺度结构比较单一,夏季的热岛尺度结构比较复杂。(2)上海城市热岛的日变化(16-32h)和周变化(128—-56h)冬季比夏季明显。(3)上海城市热岛的周变化的振荡波峰出现在周五和周六,而波谷恰好落在周一和周二。这可能是因为128-256h尺度的热岛受人为热和大气污染物的驱动,其影响滞后1-2天。To understand the time scale structure and its characteristics of Urban Heat Island (UHI), the data of urban heat island in whiter and summer in Shanghai City for 1999 are analyzed and calculated using Morlet wavelet transform in this paper. The results are shows as follows: Firstly, UHI in Shanghai is composed of multi-time scales. The time scale structure is less complex in winter than that in summer. Secondly, diurnal (16-32 hours) and weekly (128-256 hours) variations of UHI are more outstanding in winter than in summer. Thirdly, the oscillation peaks of weekly variations occur on Friday and Saturday while the troughs on Monday and Tuesday. This is probably due to anthropogenic heat and atmospheric pollutants from industries; mobile vehicles are responsible for 128-256-hour scale UHI and the influences are lagged by one or two days.

关 键 词：城市热岛 小波分析 多时间尺度 城市环境 

分 类 号：X16[环境科学与工程—环境科学]