[1080] - Uncertainty analysis of eddy covariance CO2 flux measurements for different EC tower distances using an extended two-tower approach

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Post, H., Hendricks-Franssen, H., Graf, A., Schmidt, M., Vereecken, H., 2014. Uncertainty analysis of eddy covariance CO2 flux measurements for different EC tower distances using an extended two-tower approach. Biogeosciences, 11, 1 - 41. DOI: 10.5194/bgd-11-11943-2014.
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Title(s):Main Title: Uncertainty analysis of eddy covariance CO2 flux measurements for different EC tower distances using an extended two-tower approach
Description(s):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(s):DOI: 10.5194/bgd-11-11943-2014
Responsible Party
Creator(s):Author: Hanna Post
Author: Harrie-Jan Hendricks-Franssen
Author: Alexander Graf
Author: Marius Schmidt
Author: Harry Vereecken
TR32 Topic:Atmosphere
Subject(s):CRC/TR32 Keywords: Flux Footprint, Eddy Covariance, Uncertainty Quantification, CO2
File Details
File Name:bgd-11-11943-2014.pdf
Data Type:Text
Size(s):41 Pages
File Size:1211 kB (1.183 MB)
Date(s):Modified: 2014-07-02
Mime Type:application/pdf
Data Format:PDF
Status:In Process
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
Measurement Region:Kall
Measurement Location:Rollesbroich
Specific Informations - Publication
Article Type:Journal
Number Of Pages:41
Page Range:1 - 41
Metadata Details
Metadata Creator:Marius Schmidt
Metadata Created:2014-09-18
Metadata Last Updated:2014-09-18
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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