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Evaluation of a plot-scale methane emission model using eddy covariance observations and footprint modelling

Author:
  • A. Budishchev
  • Y. Mi
  • J. van Huissteden
  • L. Belelli-Marchesini
  • G. Schaepman-Strub
  • Frans-Jan Parmentier
  • G. Fratini
  • A. Gallagher
  • T. C. Maximov
  • A. J. Dolman
Publishing year: 2014
Language: English
Pages: 4651-4664
Publication/Series: Biogeosciences
Volume: 11
Issue: 17
Document type: Journal article
Publisher: Copernicus Publications

Abstract english

Most plot-scale methane emission models - of which many have been developed in the recent past - are validated using data collected with the closed-chamber technique. This method, however, suffers from a low spatial representativeness and a poor temporal resolution. Also, during a chamber-flux measurement the air within a chamber is separated from the ambient atmosphere, which negates the influence of wind on emissions. Additionally, some methane models are validated by upscaling fluxes based on the area-weighted averages of modelled fluxes, and by comparing those to the eddy covariance (EC) flux. This technique is rather inaccurate, as the area of upscaling might be different from the EC tower footprint, therefore introducing significant mismatch. In this study, we present an approach to validate plot-scale methane models with EC observations using the footprint-weighted average method. Our results show that the fluxes obtained by the footprint-weighted average method are of the same magnitude as the EC flux. More importantly, the temporal dynamics of the EC flux on a daily timescale are also captured (r(2) = 0.7). In contrast, using the area-weighted average method yielded a low (r(2) = 0.14) correlation with the EC measurements. This shows that the footprint-weighted average method is preferable when validating methane emission models with EC fluxes for areas with a heterogeneous and irregular vegetation pattern.

Keywords

  • Physical Geography

Other

Published
  • ISSN: 1726-4189
Frans-Jan Parmentier
E-mail: frans-jan [dot] parmentier [at] nateko [dot] lu [dot] se

Associate professor

Dept of Physical Geography and Ecosystem Science

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Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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