Title: Quality Control of CarboEurope Flux Data - Part I: Coupling Footprint Analyses with Flux Data Quality Assessment to Evaluate Sites in Forest Ecosystems
Authors: GOCKEDE MatthiasFOKEN ThomasAUBINET MarcAURELA M.BANZA J.BERNHOFER C.BONNEFOND J. M.BRUNET Y.CARRARA A.CLEMENT R.DELLWIK E.ELBERS J.EUGSTER WernerFUHRER J.GRANIER A.GRUNWALD T.HEINESCH B.JANSSENS I. A.KNOHL A.KOEBLE RenateLAURILA T.LONGDOZ B.MANCA GiovanniMAREK MilanMARKKANEN T.MATEUS J.MATTEUCCI G.MAUDER M.MIGLIAVACCA MircoMINERBI StefanoMONCRIEFF JohnMONTAGNANI L.MOORS E.OURCIVAL J. M.PAPALE D.PEREIRA J.PILEGAARD K.PITA G.RAMBAL S.REBMANN C.RODRIGUES A.ROTENBERG E.SANZ M.j.SEDLAK P.SEUFERT GuentherSIEBICKE L.SOUSSANA J.f.VALENTINI R.VESALA T.VERBEECK H.YAKIR D.
Citation: Biogeosciences vol. 5 p. 433-450
Publisher: EUROPEAN GEOSCIENCES UNION
Publication Year: 2008
JRC N°: JRC41686
ISSN: 1726-4170
URI: http://www.biogeosciences.net/5/433/2008/bg-5-433-2008.pdf
http://publications.jrc.ec.europa.eu/repository/handle/JRC41686
Type: Articles in Journals
Abstract: We applied a site evaluation approach combining Lagrangian Stochastic footprint modelling with a quality assessment approach for eddy-covariance data to 25 forested sites of the CarboEurope-IP network. The analysis addresses the spatial representativeness 5 of the flux measurements, instrumental effects on data quality, spatial patterns in the data quality, and the performance of the coordinate rotation method. Our findings demonstrate that application of a footprint filter could strengthen the CarboEurope-IP flux database, since only one third of the sites is situated in truly homogeneous terrain. Almost half of the sites experience a significant reduction in eddy-covariance data 10 quality under certain conditions, though these effects are mostly constricted to a small portion of the dataset. Reductions in data quality of the sensible heat flux are mostly induced by characteristics of the surrounding terrain, while the latent heat flux is subject to instrumentation-related problems. The Planar-Fit coordinate rotation proved to be a reliable tool for the majority of the sites using only a single set of rotation angles. 15 Overall, we found a high average data quality for the CarboEurope-IP network, with good representativeness of the measurement data for the specified target land cover types.
JRC Institute:Institute for Environment and Sustainability

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