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| Titel |
Ventilation of subterranean CO2 and Eddy covariance incongruities over carbonate ecosystems |
| VerfasserIn |
A. Were, P. Serrano-Ortiz, C. Moreno de Jong, L. Villagarcía, F. Domingo, A. S. Kowalski |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 3 ; Nr. 7, no. 3 (2010-03-03), S.859-867 |
| Datensatznummer |
250004580
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| Publikation (Nr.) |
 copernicus.org/bg-7-859-2010.pdf |
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| Zusammenfassung |
| Measurements of CO2 fluxes with Eddy Covariance (EC) systems are
ongoing over different ecosystems around the world, through different
measuring networks, in order to assess the carbon balance of these
ecosystems. In carbonate ecosystems, characterized by the presence of
subterranean pores and cavities, ventilation of the CO2 accumulated in
these cavities and pores can act as an extra source of CO2 exchange
between the ecosystem and the atmosphere. In this work we analyse the effect
of the subterranean heterogeneity of a carbonate ecosystem on measurements
of CO2 fluxes by comparing measurements from two EC systems with
distinct footprints. Results showed that both EC systems agreed for
measurements of evapotranspiration and of CO2 in periods when
respiratory and photosynthetic processes were dominant (biological periods),
with a regression slope of 0.99 and 0.97, respectively. However, in periods
when the main source of CO2 comes from the ventilation of subterranean
pores and cavities (abiotic periods) agreement is not good, with a
regression slope of 0.6. Ground-penetrating radar measurements of the
sub-surface confirmed the existence of high sub-surface heterogeneity that,
combined with different footprints, lead to differences in the measurements
of the two EC systems. These results show that measurements of CO2
fluxes with Eddy covariance systems over carbonate ecosystems must be taken
carefully, as they may not be representative of the ecosystem under
consideration. |
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