Home > Publications database > Uncertainty analysis of eddy covariance CO$_{2}$ flux measurements for different EC tower distances using an extended two-tower approach > print

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024 7 _ |a 10.5194/bgd-11-11943-2014
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024 7 _ |a 1810-6285
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024 7 _ |a 2128/8273
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037 _ _ |a FZJ-2015-00513
082 _ _ |a 570
100 1 _ |a Post, H.
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245 _ _ |a Uncertainty analysis of eddy covariance CO$_{2}$ flux measurements for different EC tower distances using an extended two-tower approach
260 _ _ |a Katlenburg-Lindau [u.a.]
|c 2014
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336 7 _ |a Journal Article
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520 _ _ |a 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.
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700 1 _ |a Hendricks-Franssen, Harrie-Jan
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700 1 _ |a Graf, Alexander
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700 1 _ |a Schmidt, M.
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700 1 _ |a Vereecken, H.
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773 _ _ |a 10.5194/bgd-11-11943-2014
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