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| Titel |
Technical Note: A simple method for air–sea gas exchange measurements in mesocosms and its application in carbon budgeting |
| VerfasserIn |
J. Czerny, K. G. Schulz, A. Ludwig, U. Riebesell |
| 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 ; 10, no. 3 ; Nr. 10, no. 3 (2013-03-01), S.1379-1390 |
| Datensatznummer |
250018130
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| Publikation (Nr.) |
 copernicus.org/bg-10-1379-2013.pdf |
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| Zusammenfassung |
| Mesocosms as large experimental units provide the opportunity to perform
elemental mass balance calculations, e.g. to derive net biological turnover
rates. However, the system is in most cases not closed at the water surface
and gases exchange with the atmosphere. Previous attempts to budget carbon
pools in mesocosms relied on educated guesses concerning the exchange of
CO2 with the atmosphere. Here, we present a simple method for precise
determination of air–sea gas exchange in mesocosms using N2O as a
deliberate tracer. Beside the application for carbon budgeting, transfer
velocities can be used to calculate exchange rates of any gas of known
concentration, e.g. to calculate aquatic production rates of climate
relevant trace gases. Using an arctic KOSMOS (Kiel Off
Shore Mesocosms for future Ocean
Simulation) experiment as an exemplary dataset, it is shown that
the presented method improves accuracy of carbon budget estimates
substantially. Methodology of manipulation, measurement, data processing and
conversion to CO2 fluxes are explained. A theoretical discussion of
prerequisites for precise gas exchange measurements provides a guideline for
the applicability of the method under various experimental conditions. |
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