首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Characteristics of urban heat island effect in Lhasa City
Authors:Zhuo G  YunDan NiM  Jian Jun and PuBu CiRen
Institution:Tibet Institute of Plateau Atmospheric and Environmental Sciences, Lhasa, Tibet 850000, China;1. Meteorological Bureau of Nagqu, Nagqu, Tibet 852000, China 2. Department of Geography, University of Colorado, Boulder, Colorado 80309, U.S.A;Meteorological Bureau of Shannan, Tsetang, Tibet 856000, China;Tibet Institute of Plateau Atmospheric and Environmental Sciences, Lhasa, Tibet 850000, China
Abstract:This paper analyzes the Urban Heat Island (UHI) effect in Lhasa City of Tibet using meteorological observations, the Normalized Difference Vegetation Index (NDVI), Land Surface Temperature (LST) data obtained from Earth Observing System/Moderate resolution Imaging Spectroradiometer (EOS/MODIS) information, and correlation and composite analyses. The results show: (1) Areas with high temperature are primarily located in the center of the city or nearby counties, while low temperature areas are in the suburbs of counties. The area with high temperature has expanded in recent years and some high-temperature centers have even migrated to certain other regions. (2) The UHI intensity tends to be stronger both in annual and seasonal variations, especially in winter. Also, LST is somewhat positively related to mean air temperature. (3) A negative correlation exists between the changes of LST and NDVI with the increase of vegetation from urban to rural areas in different seasons. (4) The UHI intensity is negatively correlated with precipitation while positively correlated with wind speed, and the relation between the UHI intensity and evaporation varies with the seasons, namely, the intensity is positively correlated with summer evaporation but negatively correlated with winter evaporation. (5) UHI intensity might be enhanced by intensified urbanization, wherein built-up areas expand, there is increased heat from human activity, and there is more artificial heat input to the atmosphere.
Keywords:Lhasa  urban heat island effect  characteristics  meteorological conditions
本文献已被 万方数据 等数据库收录!
点击此处可从《寒旱区科学》浏览原始摘要信息
点击此处可从《寒旱区科学》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号