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| Titel |
Consequences of artificial deepwater ventilation in the Bornholm Basin for oxygen conditions, cod reproduction and benthic biomass – a model study |
| VerfasserIn |
A. Stigebrandt, R. Rosenberg, L. Råman Vinnå, M. Ödalen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 11, no. 1 ; Nr. 11, no. 1 (2015-01-21), S.93-110 |
| Datensatznummer |
250117128
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| Publikation (Nr.) |
 copernicus.org/os-11-93-2015.pdf |
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| Zusammenfassung |
| We develop and use a circulation model to estimate hydrographical and
ecological changes in the isolated basin water of the Bornholm Basin. By
pumping well-oxygenated so-called winter water to the greatest depth, where
it is forced to mix with the resident water, the rate of deepwater density
reduction increases as well as the frequency of intrusions of new oxygen-rich
deepwater. We show that pumping 1000 m3 s−1 should increase the
rates of water exchange and oxygen supply by 2.5 and 3 times, respectively.
The CRV (cod reproduction volume), the volume of water in the isolated basin
meeting the requirements for successful cod reproduction
(S > 11, O2 > 2 mL L−1), should every
year be greater than 54 km3, which is an immense improvement, since it
has been much less in certain years. Anoxic bottoms should no longer occur in
the basin, and hypoxic events will become rare. This should permit extensive
colonization of fauna on the earlier periodically anoxic bottoms. Increased
biomass of benthic fauna should also mean increased food supply to
economically valuable demersal fish like cod and flatfish. In addition,
re-oxygenation of the sediments should lead to increased phosphorus retention
by the sediments. |
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