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Intercomparison of eddy-covariance software for urban tall-tower sites

Lan, Changxing ; Mauder, Matthias ; Stagakis, Stavros ; Loubet, Benjamin ; D'onofrio, Claudio LU orcid ; Metzger, Stefan ; Durden, David and Herig-Coimbra, Pedro Henrique (2024) In Atmospheric Measurement Techniques 17(9). p.2649-2669
Abstract

Long-term tall-tower eddy-covariance (EC) measurements have been recently established in three European pilot cities as part of the ICOS-Cities project. We conducted a comparison of EC software to ensure a reliable generation of interoperable flux estimates, which is the prerequisite for avoiding methodological biases and improving the comparability of the results. We analyzed datasets covering 5 months collected from EC tall-tower installations located in urbanized areas of Munich, Zurich, and Paris. Fluxes of sensible heat, latent heat, and CO2 were calculated using three software packages (i.e., TK3, EddyPro, and eddy4R) to assess the uncertainty of flux estimations attributed to differences in implemented postprocessing... (More)

Long-term tall-tower eddy-covariance (EC) measurements have been recently established in three European pilot cities as part of the ICOS-Cities project. We conducted a comparison of EC software to ensure a reliable generation of interoperable flux estimates, which is the prerequisite for avoiding methodological biases and improving the comparability of the results. We analyzed datasets covering 5 months collected from EC tall-tower installations located in urbanized areas of Munich, Zurich, and Paris. Fluxes of sensible heat, latent heat, and CO2 were calculated using three software packages (i.e., TK3, EddyPro, and eddy4R) to assess the uncertainty of flux estimations attributed to differences in implemented postprocessing schemes. A very good agreement on the mean values and standard deviations was found across all three sites, which can probably be attributed to a uniform instrumentation, data acquisition, and preprocessing. The overall comparison of final flux time series products showed a good but not yet perfect agreement among the three software packages. TK3 and EddyPro both calculated fluxes with low-frequency spectral correction, resulting in better agreement than between TK3 and the eddy4R workflow with disabled low-frequency spectral treatment. These observed flux discrepancies indicate the crucial role of treating low-frequency spectral loss in flux estimation for tall-tower EC systems.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Measurement Techniques
volume
17
issue
9
pages
21 pages
publisher
Copernicus GmbH
external identifiers
  • scopus:85192726019
ISSN
1867-1381
DOI
10.5194/amt-17-2649-2024
language
English
LU publication?
yes
id
36543a4a-afb2-40c3-a90a-a454c76ae5c9
date added to LUP
2024-05-30 15:06:28
date last changed
2024-05-30 15:07:28
@article{36543a4a-afb2-40c3-a90a-a454c76ae5c9,
  abstract     = {{<p>Long-term tall-tower eddy-covariance (EC) measurements have been recently established in three European pilot cities as part of the ICOS-Cities project. We conducted a comparison of EC software to ensure a reliable generation of interoperable flux estimates, which is the prerequisite for avoiding methodological biases and improving the comparability of the results. We analyzed datasets covering 5 months collected from EC tall-tower installations located in urbanized areas of Munich, Zurich, and Paris. Fluxes of sensible heat, latent heat, and CO<sub>2</sub> were calculated using three software packages (i.e., TK3, EddyPro, and eddy4R) to assess the uncertainty of flux estimations attributed to differences in implemented postprocessing schemes. A very good agreement on the mean values and standard deviations was found across all three sites, which can probably be attributed to a uniform instrumentation, data acquisition, and preprocessing. The overall comparison of final flux time series products showed a good but not yet perfect agreement among the three software packages. TK3 and EddyPro both calculated fluxes with low-frequency spectral correction, resulting in better agreement than between TK3 and the eddy4R workflow with disabled low-frequency spectral treatment. These observed flux discrepancies indicate the crucial role of treating low-frequency spectral loss in flux estimation for tall-tower EC systems.</p>}},
  author       = {{Lan, Changxing and Mauder, Matthias and Stagakis, Stavros and Loubet, Benjamin and D'onofrio, Claudio and Metzger, Stefan and Durden, David and Herig-Coimbra, Pedro Henrique}},
  issn         = {{1867-1381}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{9}},
  pages        = {{2649--2669}},
  publisher    = {{Copernicus GmbH}},
  series       = {{Atmospheric Measurement Techniques}},
  title        = {{Intercomparison of eddy-covariance software for urban tall-tower sites}},
  url          = {{http://dx.doi.org/10.5194/amt-17-2649-2024}},
  doi          = {{10.5194/amt-17-2649-2024}},
  volume       = {{17}},
  year         = {{2024}},
}