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Consequences of artificial deepwater ventilation in the Bornholm Basin for oxygen conditions, cod reproduction and benthic biomass - a model study

Journal article
Authors Anders Stigebrandt
Rutger Rosenberg
Råman Love Vinnå
Malin Ödalen
Published in Ocean Science
Volume 11
Issue 1
Pages 93-110
ISSN 1812-0784
Publication year 2015
Published at Department of Earth Sciences
Department of Biological and Environmental Sciences
Pages 93-110
Language en
Links www.ocean-sci.net/11/93/2015/os-11-...
Keywords Deepwater ventilation, geoengineering, oxygenation, cod reproduction, colonization of benthic fauna
Subject categories Earth and Related Environmental Sciences, Biological Sciences, Other Engineering and Technologies

Abstract

We develop and use a circulation model to estimate hydrographical and ecological changes in the isolated basin water of the Bornholm Basin. By pumping welloxygenated 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 1000m3 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 > 2mL 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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