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	A preliminary study for spatial representiveness of flux observation at ChinaFLUX sites
	Mi N. ; Yu G. R. ; Wang P. X. ; Wen X. F. ; Sun X. M.
	2006
关键词	eddy covariance method footprint source weight function ChinaFLUX eddy covariance measurements lagrangian footprint model convective boundary-layer scalar fluxes surface-layer heterogeneous forest quality assessment complex terrain exchange carbon
英文摘要	The results of eddy covariance observation system could represent the physical process at certain area of the surface. Thus point-to-area representativeness was of primary interest in flux observation. This research presents a preliminary study for flux observation at ChinaFLUX sites by the use of observation data and Flux Source Area Model (FSAM). Results show that the footprint expands and is further away from flux tower when atmosphere becomes more stable, the observation height increases, or the surfaces become smoother. This suggests that the area represented by the flux observation becomes larger. The distances from the reference point to the maximum point S-max and the minimum point x(1) of source weight function (D-max and D-min, respectively) can be influenced by atmosphere stability which becomes longer when atmosphere is more stable. For more rough surfaces and lower observation point D-max and D-min become shorter. This research gives the footprint at level P=90% at ChinaFLUX sites at different atmosphere stability. The preliminary results of spatial representiveness at ChinaFLUX sites were given based on the dominant wind direction and footprint response to various factors. The study also provides some theoretical basis for data quality control and evaluating data uncertainty.
出处	Science in China Series D-Earth Sciences
卷	49
页	24-35
收录类别	SCI
语种	英语
ISSN号	1006-9313
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23273]
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	Mi N.,Yu G. R.,Wang P. X.,et al. A preliminary study for spatial representiveness of flux observation at ChinaFLUX sites. 2006.

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