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Direct advection measurements do not help to solve the night-time CO2 closure problem: Evidence from three different forests
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SYSNO ASEP 0348597 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Direct advection measurements do not help to solve the night-time CO2 closure problem: Evidence from three different forests Author(s) Aubinet, M. (BE)
Feigenwinter, C. (CH)
Heinesch, B. (BE)
Bernhofer, C. (DE)
Canepa, E. (IT)
Lindroth, A. (SE)
Montagnani, L. (IT)
Rebmann, C. (DE)
Sedlák, Pavel (UFA-U) RID, ORCID
Van Gorsel, E. (AU)Source Title Agricultural and Forest Meteorology. - : Elsevier - ISSN 0168-1923
Roč. 150, č. 5 (2010), s. 655-664Number of pages 10 s. Language eng - English Country NL - Netherlands Keywords Advection ; Forests ; CO2 fluxes ; Eddy covariance Subject RIV DG - Athmosphere Sciences, Meteorology R&D Projects IAA300420803 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000278244400002 DOI 10.1016/j.agrformet.2010.01.016 Annotation The ADVEX project involved extensive advection measurements at three sites differing in topography. One aim of the project was to measure the CO2 balance in night-time conditions, in an attempt to improve NEE estimates. Horizontal advection varied greatly from site to site and from one wind sector to another, with the highest values reached at large friction velocities. The night-time NEE estimates deduced from the mass balance were incompatible with biologically driven fluxes because they varied strongly from one wind sector to another, their order of magnitude was not realistic and they still showed a trend vs. friction velocity. From a critical analysis of the measurement and data treatment we concluded that the causes of the problem are related to the measurement representativeness or the simplified CO2 mass balance equation used. This suggests that the improvement of eddy flux measurements by developing an advection-completed CO2 mass balance at night would be practically difficult. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2011
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