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	Assessing eddy-covariance flux tower location bias across the Fluxnet-Canada Research Network based on remote sensing and footprint modelling
	Chen B. Z. ; Coops N. C. ; Fu D. J. ; Margolis H. A. ; Amiro B. D. ; Barr A. G. ; Black T. A. ; Arain M. A. ; Bourque C. P. A. ; Flanagan L. B. ; Lafleur P. M. ; Mccaughey J. H. ; Wofsy S. C.
	2011
关键词	SAFE footprint model NDVI EVI Footprint climatology Sensor location bias Eddy covariance Fluxnet Carbon flux Net ecosystem exchange carbon-dioxide exchange northern temperate grassland gross primary production surface-energy quality assessment scalar fluxes forest vegetation ecosystem balance
英文摘要	We describe an approach for evaluating the representativeness of eddy covariance flux measurements and assessing sensor location bias (SLB) based on footprint modelling and remote sensing This approach was applied to the 12 main sites of the Fluxnet-Canada Research Network (FCRN)/Canadian Carbon Program (CCP) located along an east-west continental-scale transect covering grassland forest and wetland biomes For each site monthly and annual footprint climatologies e monthly or annual cumulative footprints) were calculated using the Simple Analytical Footprint model on Eulerian coordinates (SAFE) The resulting footprint climatologies were then overlaid on to Images of the Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) derived from LANDSAT Thematic Mapper (TM) imagery which were used as surrogates of land surface fluxes to estimate SLB Results indicate that (i) the sizes of annual footprint climatology Increased exponentially with increasing cumulative footprint percentages and for a given percentage of footprint climatology the footprint areas were significantly different among the sites Typically the 90% annual footprint climatology areas varied from 1 1 km(2) to 5 0 km(2) (ii) using either NDVI or EVI as the flux surrogate the SLB was less than 5% for most sites with respect to the reference area of interest (A(r)) at 90% annual footprint climatology (scenario A) and a circular area with radius of 1 km centred at the individual tower (scenario B) with several exceptions (iii) the SLB decreased with increasing size of footprint climatology for all sites for both scenarios A and B (iv) out of 12 eight flux towers represented most of the ecosystem surrounding the towers for an area of 0 3 km(2) up to 10 km(2) with a satisfactorily low bias of <5% whereas four towers represented areas ranging from only 0 75 to 4 km(2) and (v) the seasonal differences in monthly SLB using NDVI as a flux surrogate were about 1-4% for most sites for both scenarios A and B (C) 2010 Elsevier B V All rights reserved
出处	Agricultural and Forest Meteorology
卷	151
期	1
页	87-100
收录类别	SCI
ISSN号	0168-1923
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24268]
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	Chen B. Z.,Coops N. C.,Fu D. J.,et al. Assessing eddy-covariance flux tower location bias across the Fluxnet-Canada Research Network based on remote sensing and footprint modelling. 2011.

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