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| Titel |
Towards a consistent eddy-covariance processing: an intercomparison of EddyPro and TK3 |
| VerfasserIn |
G. Fratini, M. Mauder |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 7 ; Nr. 7, no. 7 (2014-07-29), S.2273-2281 |
| Datensatznummer |
250115857
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| Publikation (Nr.) |
 copernicus.org/amt-7-2273-2014.pdf |
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| Zusammenfassung |
A comparison of two popular eddy-covariance software packages is presented,
namely, EddyPro and TK3. Two approximately 1-month long test data sets were
processed, representing typical instrumental setups (i.e., CSAT3/LI-7500
above grassland and Solent R3/LI-6262 above a forest). The resulting fluxes
and quality flags were compared. Achieving a satisfying agreement and
understanding residual discrepancies required several iterations and
interventions of different nature, spanning from simple software
reconfiguration to actual code manipulations. In this paper, we document our
comparison exercise and show that the two software packages can provide
utterly satisfying agreement when properly configured. Our main aim,
however, is to stress the complexity of performing a rigorous comparison of
eddy-covariance software. We show that discriminating actual discrepancies
in the results from inconsistencies in the software configuration requires
deep knowledge of both software packages and of the eddy-covariance method.
In some instances, it may be even beyond the possibility of the investigator
who does not have access to and full knowledge of the source code. Being the
developers of EddyPro and TK3, we could discuss the comparison at all levels
of details and this proved necessary to achieve a full understanding. As a
result, we suggest that researchers are more likely to get comparable
results when using EddyPro (v5.1.1) and TK3 (v3.11) – at least with the
setting presented in this paper – than they are when using any other pair of
EC software which did not undergo a similar cross-validation.
As a further consequence, we also suggest that, to the aim of assuring
consistency and comparability of centralized flux databases, and for a
confident use of eddy fluxes in synthesis studies on the regional,
continental and global scale, researchers only rely on software that have
been extensively validated in documented intercomparisons. |
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