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  Estimating nocturnal ecosystem respiration from the vertical turbulent flux and change in storage of CO2

Van Gorsel, E., Delpierre, N., Leuning, R., Black, A., Munger, J. W., Wofsy, S., et al. (2009). Estimating nocturnal ecosystem respiration from the vertical turbulent flux and change in storage of CO2. Agricultural and Forest Meteorology, 149(11), 1919-1930. doi:10.1016/j.agrformet.2009.06.020.

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BGC1292.pdf (Verlagsversion), 518KB
 
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Van Gorsel, E., Autor
Delpierre, N., Autor
Leuning, R., Autor
Black, A., Autor
Munger, J. W., Autor
Wofsy, S., Autor
Aubinet, M., Autor
Feigenwinter, C., Autor
Beringer, J., Autor
Bonal, D., Autor
Chen, B. Z., Autor
Chen, J. Q., Autor
Clement, R., Autor
Davis, K. J., Autor
Desai, A. R., Autor
Dragoni, D., Autor
Etzold, S., Autor
Grunwald, T., Autor
Gu, L. H., Autor
Heinesch, B., Autor
Hutyra, L. R., AutorJans, W. W. P., AutorKutsch, W. L.1, Autor           Law, B. E., AutorLeclerc, M. Y., AutorMammarella, I., AutorMontagnani, L., AutorNoormets, A., AutorRebmann, C., AutorWharton, S., Autor mehr..
Affiliations:
1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497751              

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Schlagwörter: Ecosystem respiration Micrometeorology Advection u-star correction Eddy covariance Chamber Process-based modelling EDDY COVARIANCE MEASUREMENTS TEMPERATE DECIDUOUS FOREST CARBON-DIOXIDE EXCHANGE PONDEROSA PINE FORESTS LONG-TERM MEASUREMENTS DOUGLAS-FIR STAND OLD-GROWTH FOREST SOIL RESPIRATION PACIFIC-NORTHWEST DIFFICULT CONDITIONS
 Zusammenfassung: Micrometeorological measurements of night time ecosystem respiration can be systematically biased when stable atmospheric conditions lead to drainage flows associated with decoupling of air flow above and within plant canopies. The associated horizontal and vertical advective fluxes cannot be measured using instrumentation on the single towers typically used at micrometeorological sites. A common approach to minimize bias is to use a threshold in friction velocity, u*, to exclude periods when advection is assumed to be important, but this is problematic in situations when in-canopy flows are decoupled from the flow above. Using data from 25 flux stations in a wide variety of forest ecosystems globally, we examine the generality of a novel approach to estimating nocturnal respiration developed by van Gorsel et al. (van Gorsel, E., Leuning, R., Cleugh, H.A., Keith, H., Suni, T., 2007. Nocturnal carbon efflux: reconciliation of eddy covariance and chamber measurements using an alternative to the u*-threshold filtering technique. Tellus 59B, 397-403, Tellus, 59B, 307-403). The approach is based on the assumption that advection is small relative to the vertical turbulent flux (F-C) and change in storage (F-S) of CO2 in the few hours after sundown. The sum of F-C and F-S reach a maximum during this period which is used to derive a temperature response function for ecosystem respiration. Measured hourly soil temperatures are then used with this function to estimate respiration R-Rmax. The new approach yielded excellent agreement with (1) independent measurements using respiration chambers, (2) with estimates using ecosystem light-response curves of F-c + F-s extrapolated to zero light, R-LRC, and (3) with a detailed process-based forest ecosystem model, R-cast. At most sites respiration rates estimated using the u*-filter, R-ust, were smaller than R-Rmax, and R-LRC. Agreement of our approach with independent measurements indicates that R-Rmax, provides an excellent estimate of nighttime ecosystem respiration. (C) 2009 Elsevier B.V. All rights reserved.

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Sprache(n): eng - English
 Datum: 2009
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1016/j.agrformet.2009.06.020
ISI: ://000270640300013
Anderer: BGC1292
 Art des Abschluß: -

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Titel: Agricultural and Forest Meteorology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Amsterdam : Elsevier
Seiten: - Band / Heft: 149 (11) Artikelnummer: - Start- / Endseite: 1919 - 1930 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954928468040
ISSN: 0168-1923