【摘要】 利用北京地区1999年的Landsat7/ETM+热红外波段数据反演陆表温度,用热岛比率指数表征陆表温度的空间分布差异。通过计算北京市城区及辖区共15个区、五环路内各环线间区域、以及以故宫为中心的8个方向剖线的缓冲区的热岛比率指数,定量分析其陆表温度空间分布特征。结果表明:北京地区陆表温度空间分布存在明显的差异。总体上城区整体处于次高温区,局部表现为高温区,并且在城区以外的辖区出现了多热岛中心分布的特征;对城区及辖区热岛比率指数分析发现,热岛比率指数最大的区域并不是城区,而是顺义区,为0.6210,其平均地表温度在各区域中也最高,为38.08℃。城区大部分处于次高温区中,热岛比率指数为0.6118,平均陆表温度为37.18℃;五环内区域的平均陆表温度为36.97℃,五环以外区域的平均陆表温度35.18℃;对于五环内各环线间的区域,四环至三环间的区域热岛比率指数最高,为0.6327,其平均地表温度为37.48℃;就8个方向剖线的缓冲区分析总体来看,东向和南向热岛比率指数较高,而西向和北向较低。更多还原

【Abstract】 The paper quantificationally analyzed the spatial characteristics of land surface temperature(LST) by calculating the urban heat island ratio index(URI) of Beijing area,including each zone between ring road and each transect buffer.The results show that difference of LST is significant in Bejing.LST of urban area(including East district,West district,Chongwen district and Xuanwu district) is higher than other regions.UHI show multi-center distribution pattern.Thermal-infrared images of Landsat Enhanced Thematic Mapper Plus(ETM+) in 1999 was used to retrieve the LST of urban and surrounding area of Beijing,URI was selected as the indicator to estimate spatial characteristic of LST.Among all administrative districts,the URI of Shunyi district and its mean LST is the highest,and the value is 0.6210,the mean LST is 38.08℃.The URI of urban area is 0.6118,its mean LST is 37.18℃.The mean LST is 36.97℃ in the fifth ring road zone,the mean LST is 35.18℃ beyond of the fifth ring road zone.Among all zones between ring roads,the highest URI is in the zone between the fifth ring road and the fourth ring road,the value is 0.6327,and the mean LST is 37.48℃.Among eight transect buffers,the URI of east transect and south transect buffer are higher than others,and the URI of west transect and north transect buffer are lower.更多还原