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	Quantifying the heat flux regulation of metropolitan land use/land cover components by coupling remote sensing modeling with in situ measurement
	Kuang W. H.; Dou, Y. Y.; Zhang, C.; Chi, W. F.; Liu, A. L.; Liu, Y.; Zhang, R. H.; Liu, J. Y.
	2015
关键词	urban urban heat island heat flux Bowen ratio land use land cover components surface-energy balance difference vegetation index urban surface impervious surface temperature retrieval longwave radiation thematic mapper regional-scale soil-moisture local-scale
英文摘要	Quantifying the effects of urban land use/land cover with regard to surface radiation and heat flux regulation is important to ecological planning and heat stress mitigation. To retrieve the spatial pattern of heat fluxes in the Beijing metropolitan area, China, a remote sensing-based energy balance model was calibrated with synchronously measured energy fluxes including net radiation, latent heat flux (LE), and sensible heat flux (H). Our model calibration approach avoided the uncertainties due to subjective judgments in previous empirical parameterization methods. The land surface temperature (LST), H, and Bowen ratio () of Beijing were found to increase along the outskirt-suburban-urban gradient, with strong spatial variation. LST and H were negatively correlated with vegetation fraction cover (VFC). For example, the modern high-rise residential areas with relatively higher VFC had lower H and than the traditional low-rise residential areas. Our findings that indicate thermal dissipation through vegetation transpiration might play an important role in urban heat regulation. Notably, the thermal dissipating strength of vegetation (calculated as LE/VFC) declined exponentially with increased VFC. For the purpose of heat stress regulation, we recommend upgrading the traditional low-rise residential areas to modern high-rise residential areas and focusing urban greenery projects in areas whose VFC<0.1, where the heat regulating service by urban vegetation could be twice as effective as in other places. Key Points
出处	Journal of Geophysical Research-Atmospheres
卷	120
期	1
页	113-130
收录类别	SCI
语种	英语
ISSN号	2169-897X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/38684]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Kuang W. H.,Dou, Y. Y.,Zhang, C.,et al. Quantifying the heat flux regulation of metropolitan land use/land cover components by coupling remote sensing modeling with in situ measurement. 2015.

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