The assessment of water vapour and carbon dioxide fluxes above arable crops – A comparison of methods

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Abstract:

Vertical fluxes of water vapour and carbon dioxide obtained from gradient, eddy covariance (closed and open path systems) and chamber measurements above arable crops were compared with the directly measured energy balance and the harvested net biomass carbon. The gradient and chamber measurements were in the correct order of magnitude, whereas the closed path eddy covariance system showed unacceptably small fluxes. Correction methods based on power spectra analysis yielded increased fluxes. However, the energy balance could not be closed satisfactorily. The application of the open path system proved to be successful. The SVAT model PLATIN which had been adapted to various arable crops was able to depict the components of the energy balance adequately. Net carbon fluxes determined with the corrected closed path data sets, chamber, and SVAT model equal those of the harvested carbon.

German
Vertikale Flüsse von Wasserdampf und Kohlenstoffdioxid über Ackerland wurden mit Hilfe von Gradientenund Eddy-Kovarianz-Messungen (closed- und open-path-Systeme) und mit Kammermessungen durchgeführt und mit direkten Messungen der Energiebilanzglieder und der mit dem Erntegut abgeführten Kohlenstoffmenge verglichen. Die Gradienten- und Kammermessungen lagen in den richtigen Größenordnungen. Das closed-path-Eddy-Kovarianz-System dagegen ergab deutlich zu kleine Flüsse. Die Korrekturen auf Grundlage von Spektralanalysen führten zu erhöhten Flüssen. Die Energiebilanz konnte jedoch nicht zufriedenstellend geschlossen werden. Dagegen war die Anwendung eines open-path-Systems unmittelbar erfolgreich. Das SVAT-Modell PLATIN, das auf verschiedene Ackerfrüchte adaptiert wurde, war in der Lage, die Energiebilanzglieder zutreffend abzubilden. Die mit den korrigierten closed-path-Datensätzen, mit der Kammer und die dem SVAT-Modell bestimmten Kohlenstoff-Nettoflüsse entsprachen den geernteten Kohlenstoffmengen.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2005/0016

Publication date: April 1, 2005

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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