DocumentCode :
2318952
Title :
The characteristics of urban heat island variation in Beijing urban area and its impact factors
Author :
Zhang Jiahua ; Yao Fengmei
Author_Institution :
Lab. for Remote Sensing & Climate Inf. Sci., Chinese Acad. of Meteorol. Sci., Beijing
fYear :
2009
fDate :
20-22 May 2009
Firstpage :
1
Lastpage :
6
Abstract :
The relationships among urban heat island (UHI) distribution and landcover categories, topographic factor, vegetation greenness, and surface evapotranspiration are analyzed in Beijing urban area in 2001. The results show that the significant UHI occurs in Beijing urban area in the four seasons. The land surface temperature (LST) difference is approximately 4-6degC between Beijing city and suburb areas, comparatively is 8-10degC between Beijing city area and outer suburbs area in northwestern region in summer time. The UHI spatial distribution is corresponding with the urban geometry structure profile. The UHI in nighttime is obvious than that in daytime in Beijing city area. And in the daytime, the significant UHI mainly appears in the summer. The evapotranspiration in suburb area is larger than that in urban area in the summer, and significantly high latent heat exchange leads to LST difference between city and suburb area. The reflection of surface landcover categories is sensitive to the UHI, and the scatterplot shows that there is the negative correlation between NDVI and LST (R2 = 0.6481). It indicates that the vegetation greenness is a key factor for reducing the UHI, and large-scale construction of greenbelt can considerably reduce the UHI effect.
Keywords :
atmospheric temperature; evaporation; transpiration; vegetation; AD 2001; Beijing urban area; China; land surface temperature; landcover categories; latent heat exchange; surface evapotranspiration; topographic factor; urban geometry structure profile; urban heat island distribution; urban heat island variation; vegetation greenness; Cities and towns; Geometry; Land surface; Land surface temperature; Reflection; Scattering; Surface topography; Thermal pollution; Urban areas; Vegetation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Urban Remote Sensing Event, 2009 Joint
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-3460-2
Electronic_ISBN :
978-1-4244-3461-9
Type :
conf
DOI :
10.1109/URS.2009.5137502
Filename :
5137502
Link To Document :
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