Počet záznamů: 1

Direct advection measurements do not help to solve the night-time CO2 closure problem: Evidence from three different forests

  1. 1.
    0348597 - UFA-U 2011 RIV NL eng J - Článek v odborném periodiku
    Aubinet, M. - Feigenwinter, C. - Heinesch, B. - Bernhofer, C. - Canepa, E. - Lindroth, A. - Montagnani, L. - Rebmann, C. - Sedlák, Pavel - Van Gorsel, E.
    Direct advection measurements do not help to solve the night-time CO2 closure problem: Evidence from three different forests.
    Agricultural and Forest Meteorology. Roč. 150, č. 5 (2010), s. 655-664 ISSN 0168-1923
    Grant CEP: GA AV ČR IAA300420803
    Grant ostatní: European Commission(XE) GOCECT2003-505572
    Výzkumný záměr: CEZ:AV0Z30420517
    Klíčová slova: Advection * Forests * CO2 fluxes * Eddy covariance
    Kód oboru RIV: DG - Vědy o atmosféře, meteorologie
    Impakt faktor: 3.228, rok: 2010

    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.
    Trvalý link: http://hdl.handle.net/11104/0189099