http://www.cnr.it/ontology/cnr/individuo/prodotto/ID49749

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

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Direct advection measurements do not help to solve the night-time CO2 closure problem: Evidence from three different forests (Articolo in rivista) (literal)

Anno

2010-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.agrformet.2010.01.016 (literal)

Alternative label

Aubinet M.; Feigenwinter C.; Heinesch B.; Bernhofer C.; Canepa E.; Lindroth A.; Montagnani L.; Rebmann C.; Sedlak P.; Van Gorsel E. (2010)
Direct advection measurements do not help to solve the night-time CO2 closure problem: Evidence from three different forests
in Agricultural and forest meteorology (Print); ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Aubinet M.; Feigenwinter C.; Heinesch B.; Bernhofer C.; Canepa E.; Lindroth A.; Montagnani L.; Rebmann C.; Sedlak P.; Van Gorsel E. (literal)

Pagina inizio

655 (literal)

Pagina fine

664 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

Special Issue on Advection: ADVEX and Other Direct Advection Measurement Campaigns, C. Feigenwinter, M. Aubinet, E. Falge (eds.) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://ac.els-cdn.com/S0168192310000390/1-s2.0-S0168192310000390-main.pdf?_tid=02f740f05ad0f985f577e3fbdffc5ac5&acdnat=1335176141_366e9f4ec58ae3865dc4b78e52eebc27 (literal)

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150 (literal)

Rivista

Agricultural and forest meteorology (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

5 (literal)

Note

Scopu (literal)
ISI Web of Science (WOS) (literal)

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Aubinet M.; Feigenwinter C.; Heinesch B.: Universite´ de Lie`ge, Gembloux Agro-Bio Tech (Gx-ABT), Unite´ de Physique des Biosyste`mes, Passage des De´porte´s, 2, 5030 Gembloux, Belgium; Feigenwinter C.: University of Basel, Institute of Meteorology, Climatology and Remote Sensing (MCR), Basel, Switzerland; Bernhofer C.: TU Dresden (TUD), Institute of Hydrology and Meteorology, Department of Meteorology, Dresden, Germany; Canepa E.: CNR-ISMAR, via De Marini 6, 16149 Genova, Italy; Lindroth A.: University of Lund (LUND), GeoBiosphere Science Centre, Physical Geography and Ecosystems Analysis, Lund, Sweden; Montagnani L.: Forest Service and Agency for the Environment, Autonomous Province of Bolzano, Bolzano, Italy; Montagnani L.: Free University of Bolzano/Bozen, Bolzano, Italy; Rebmann C.: Max Planck Institute for Biogeochemistry (MPI-BGC), Jena, Germany; Sedlak P.: Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic; Van Gorsel E.: CSIRO, Marine and Atmospheric Research, Canberra, ACT, Australia. (literal)

Titolo

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

Abstract

The ADVEX project involved conducting extensive advection measurements at three sites, each with a different topography. One goal of the project was to measure the [CO2] balance under night-time conditions, in an attempt to improve NEE estimates. Four towers were arranged in a square around a main tower, with the sides of the square about 100 m long. Equipped with 16 sonic anemometers and [CO2] sampling points, the towers were installed to measure vertical and horizontal advection of [CO2]. Vertical turbulent fluxes were measured by an eddy covariance system at the top of the main tower. The results showed that horizontal advection varied greatly from site to site and from one wind sector to another, the highest values being reached when there were large friction velocities and fairly unstable conditions. There was less variation in vertical advection, the highest values being reached when there were low friction velocities and stable conditions. The night-time NEE estimates deduced from the mass balance were found to be incompatible with biologically driven fluxes because (i) they varied strongly from one wind sector to another and this variation could not be explained in terms of a response of the biologic flux to climate, (ii) their order of magnitude was not realistic and (iii) 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 representativeness of the measurement (control volume size, sampling resolution) or the hypotheses underlying the derivation of the [CO2] mass balance (ignoring the horizontal turbulent flux divergence). This suggests that the improvement of eddy flux measurements by developing an advection completed [CO2] mass balance at night would be practically difficult. ? 2010 Elsevier B.V. All rights reserved. (literal)

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