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The Impacts of Physical Processes on Oxygen Variations in the North Sea-baltic Sea Transition Zone : Volume 8, Issue 1 (24/01/2012)

By Jonasson, L.

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Book Id: WPLBN0004020582
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: The Impacts of Physical Processes on Oxygen Variations in the North Sea-baltic Sea Transition Zone : Volume 8, Issue 1 (24/01/2012)  
Author: Jonasson, L.
Volume: Vol. 8, Issue 1
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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S. Hanse, J. L., Wan, Z., She, J., & Jonasson, L. (2012). The Impacts of Physical Processes on Oxygen Variations in the North Sea-baltic Sea Transition Zone : Volume 8, Issue 1 (24/01/2012). Retrieved from

Description: Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen, Denmark. The bottom water of the North Sea–Baltic Sea transition zone suffers from seasonal hypoxia, usually during late summer and autumn. These hypoxic events are critical for the benthic ecosystems and the concentration of dissolved oxygen is an important measure of the water quality. However, to model the subsurface dissolved oxygen is a major challenge, especially in estuaries and coastal regions. In this study a simple oxygen consumption model is coupled to a 3-D hydrodynamical model in order to analyse oxygen variations in the transition zone. The benthic and pelagic consumption of oxygen is modelled as a function of water temperature and oxygen concentration. A quantitative assessment of the model demonstrates that the model is able to resolve both seasonal and interannual variations in dissolved oxygen. Results from several experimental simulations highlight the importance of physical processes in the regulation of dissolved oxygen. Advective oxygen transport and wind induced mixing are two key processes that control the extent of hypoxia in the transition zone.

The impacts of physical processes on oxygen variations in the North Sea-Baltic Sea transition zone

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