Uncertainty analysis of eddy covariance CO2 flux measurements for different EC tower distances using an extended two-tower approach

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*Title:*	Main Title: Uncertainty analysis of eddy covariance CO2 flux measurements for different EC tower distances using an extended two-tower approach
*Description:*	Abstract: The use of eddy covariance CO2 flux measurements in data assimilation and other applications requires an estimate of the random uncertainty. In previous studies, the two-tower approach has yielded robust uncertainty estimates, but care must be taken to meet the often competing requirements of statistical independence (non-overlapping footprints) and ecosystem homogeneity when choosing an appropriate tower distance. The role of the tower distance was investigated with help of a roving station separated between 8 m and 34 km from a permanent EC grassland station. Random uncertainty was estimated for five separation distances with an extended two-tower approach which removed systematic differences of CO2 fluxes measured at two EC towers. This analysis was made for a dataset where (i) only similar weather conditions at the two sites were included and (ii) an unfiltered one. The extended approach, applied to weather-filtered data for separation distances of 95 m and 173 m gave uncertainty estimates in best correspondence with the independent reference method The introduced correction for systematic flux differences considerably reduced the overestimation of the two-tower based uncertainty of net CO2 flux measurements, e.g. caused by different environmental conditions at both EC towers. It is concluded that the extension of the two-tower approach can help to receive more reliable uncertainty estimates because systematic differences of measured CO2 fluxes which are not part of random error are filtered out.
*Identifier:*	10.5194/bgd-11-11943-2014 (DOI)

Responsible Party

*Creators:*	Hanna Post (Author), Harrie-Jan Hendricks-Franssen (Author), Alexander Graf (Author), Marius Schmidt (Author), Harry Vereecken (Author)
*Publisher:*	Biogeosciences
*Publication Year:*	2014

Topic

*TR32 Topic:*	Atmosphere
*Related Subproject:*	Z3
*Subjects:*	Keywords: Flux Footprint, Eddy Covariance, Uncertainty Quantification, CO2

File Details

*Filename:*	bgd-11-11943-2014.pdf
*Data Type:*	Text - Article
*Size:*	41 Pages
*File Size:*	1.2 MB
*Date:*	Updated: 02.07.2014
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	In Process

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	For internal use only
*Access Limitations:*	For internal use only
*Licence:*	[TR32DB] Data policy agreement

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*Publication Status:*	Submitted
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Biogeosciences
*Source Website:*	http://www.biogeosciences-discuss.net/11/11943/2014/bgd-11-11943-2014-discussion.html
*Volume:*	11
*Number of Pages:*	41 (1 - 41)

Metadata Details

*Metadata Creator:*	Marius Schmidt
*Metadata Created:*	18.09.2014
*Metadata Last Updated:*	18.09.2014
*Subproject:*	Z3
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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