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| Titel |
Kinetic bottlenecks to respiratory exchange rates in the deep-sea – Part 1: Oxygen |
| VerfasserIn |
A. F. Hofmann, E. T. Peltzer, P. G. Brewer |
| 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. 7 ; Nr. 10, no. 7 (2013-07-25), S.5049-5060 |
| Datensatznummer |
250018361
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| Publikation (Nr.) |
 copernicus.org/bg-10-5049-2013.pdf |
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| Zusammenfassung |
| Ocean warming is now reducing dissolved oxygen concentrations, which can pose
challenges to marine life. Oxygen limits are traditionally reported simply as
a static concentration threshold with no temperature, pressure or flow rate
dependency. Here we treat the oceanic oxygen supply potential for
heterotrophic consumption as a dynamic molecular exchange problem analogous
to familiar gas exchange processes at the sea surface. A combination of the
purely physico-chemical oceanic properties temperature, hydrostatic pressure,
and oxygen concentration defines the ability of the ocean to provide the
oxygen supply to the external surface of a respiratory membrane. This general
oceanic oxygen supply potential is modulated by further properties such as
the diffusive boundary layer thickness to define an upper limit to oxygen
supply rates. While the true maximal oxygen uptake rate of any organism is
limited by gas transport either across the respiratory interface of the
organism itself or across the diffusive boundary layer around an organism,
controlled by physico-chemical oceanic properties, it can never be larger
than the latter. Here, we define and calculate quantities that describe this
upper limit to oxygen uptake posed by physico-chemical properties around an
organism and show examples of their oceanic profiles. |
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