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

Budishchev, A.; Mi, Y.; van Huissteden, J.; Belelli-Marchesini, L.; Schaepman-Strub, G.; Parmentier, Frans-Jan LU ; Fratini, G.; Gallagher, A.; Maximov, T. C. and Dolman, A. J. (2014) In Biogeosciences 11(17). p.4651-4664
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biogeosciences
volume
11
issue
17
pages
4651 - 4664
publisher
Copernicus Publications
external identifiers
  • wos:000342116000007
  • scopus:84906879064
ISSN
1726-4189
DOI
10.5194/bg-11-4651-2014
language
English
LU publication?
yes
id
594ae0bc-cb43-4a2a-a57b-b69b18dacf0c (old id 4709762)
date added to LUP
2014-10-23 12:35:35
date last changed
2017-06-25 03:10:30
@article{594ae0bc-cb43-4a2a-a57b-b69b18dacf0c,
  abstract     = {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.},
  author       = {Budishchev, A. and Mi, Y. and van Huissteden, J. and Belelli-Marchesini, L. and Schaepman-Strub, G. and Parmentier, Frans-Jan and Fratini, G. and Gallagher, A. and Maximov, T. C. and Dolman, A. J.},
  issn         = {1726-4189},
  language     = {eng},
  number       = {17},
  pages        = {4651--4664},
  publisher    = {Copernicus Publications},
  series       = {Biogeosciences},
  title        = {Evaluation of a plot-scale methane emission model using eddy covariance observations and footprint modelling},
  url          = {http://dx.doi.org/10.5194/bg-11-4651-2014},
  volume       = {11},
  year         = {2014},
}