Artigo Acesso aberto Revisado por pares

Quality control of CarboEurope flux data – Part 1: Coupling footprint analyses with flux data quality assessment to evaluate sites in forest ecosystems

2008; Copernicus Publications; Volume: 5; Issue: 2 Linguagem: Inglês

10.5194/bg-5-433-2008

ISSN

1726-4189

Autores

Mathias Göckede, Thomas Foken, Marc Aubinet, Minna Aurela, J. Banza, Christian Bernhofer, J. M. Bonnefond, Yves Brunet, Arnaud Carrara, R. Clement, Ebba Dellwik, J.A. Elbers, W. Eugster, Jürg Fuhrer, André Granier, Thomas Grünwald, Bernard Heinesch, Ivan A. Janssens, Alexander Knohl, Renate Koeble, T. Laurila, Bernard Longdoz, Giovanni Manca, Michal V. Marek, T. Markkanen, J. Mateus, Gioṙgio Matteucci, Matthias Mauder, Mirco Migliavacca, Stefano Minerbi, J. B. Moncrieff, Leonardo Montagnani, Eddy Moors, Jean‐Marc Ourcival, Dario Papale, J. S. Pereira, Kim Pilegaard, Gabriel Pita, Serge Rambal, Corinna Rebmann, Abel Rodrigues, Eyal Rotenberg, María José Sanz, Pavel Sedlák, G. Seufert, Lukas Siebicke, Jean‐François Soussana, Riccardo Valentini, Timo Vesala, Hans Verbeeck, Dan Yakir,

Tópico(s)

Tree-ring climate responses

Resumo

Abstract. We applied a site evaluation approach combining Lagrangian Stochastic footprint modeling with a quality assessment approach for eddy-covariance data to 25 forested sites of the CarboEurope-IP network. The analysis addresses the spatial representativeness 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 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. 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.

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