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Innovative gap-filling strategy for annual sums of CO₂ net ecosystem exchange

Titelangaben

Ruppert, Johannes ; Mauder, Matthias ; Thomas, Christoph ; Lüers, Johannes:
Innovative gap-filling strategy for annual sums of CO₂ net ecosystem exchange.
In: Agricultural and Forest Meteorology. Bd. 138 (2006) Heft 1/4 . - S. 5-18.
ISSN 0168-1923
DOI: https://doi.org/10.1016/j.agrformet.2006.03.003

Abstract

The determination of carbon dioxide net ecosystem exchange (NEE) with the eddy covariance (EC) method has become a fundamental tool for the investigation of the carbon balance of terrestrial ecosystems. This study presents a strategy for theprocessing, subsequent quality control and gap-filling of carbon dioxide eddy covariance flux measurements for the derivation of annual sums of NEE. A set of criteria used for quality assessment identified periods with instrumental or methodologicalfailures. These criteria included tests for the methodological prerequisites of the EC method.The complete evaluation scheme was applied to data recorded above a spruce forest at the LUXNET-station Waldstein-Weidenbrunnen (DE-Wei) in 2003. Comparison of this new evaluation scheme to the use of a friction velocity (u*) thresholdcriterion of 0.3ms-1 indicates less systematic distribution of data gaps. The number of available high quality nighttime measurements increased. This effect was mostpronounced during summer, when data is highly needed for a robust parameterization of respiratory fluxes. Non-linear regression analysis showed that air temperature and global radiation explain most of the variability of NEE and further seasonal segregation of the data based on an objective method did not significantly improve predictions at this evergreen forest site. The remaining pattern of systematic dependence of nighttime NEE on u* suggests that 'pressure pumping' has a significant influence on the release of respired carbon dioxide from the forest floorduring nighttime.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER35989
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Mikrometeorologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Mikrometeorologie > Professur Mikrometeorologie - Univ.-Prof. Dr. Christoph K. Thomas
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 24 Apr 2015 11:56
Letzte Änderung: 16 Jan 2020 08:36
URI: https://eref.uni-bayreuth.de/id/eprint/11448