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Publications (2 of 2) Show all publications
Hordoir, R., Axell, L., Löptien, U., Dietze, H. & Kuznetsov, I. (2015). Influence of sea level rise on the dynamics of salt inflows in the Baltic Sea. Journal of Geophysical Research - Oceans, 120(10), 6653-6668
Open this publication in new window or tab >>Influence of sea level rise on the dynamics of salt inflows in the Baltic Sea
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2015 (English)In: Journal of Geophysical Research - Oceans, ISSN 2169-9275, E-ISSN 2169-9291, Vol. 120, no 10, p. 6653-6668Article in journal (Refereed) Published
Abstract [en]

The Baltic Sea is a marginal sea, located in a highly industrialized region in Central Northern Europe. Saltwater inflows from the North Sea and associated ventilation of the deep exert crucial control on the entire Baltic Sea ecosystem. This study explores the impact of anticipated sea level changes on the dynamics of those inflows. We use a numerical oceanic general circulation model covering both the Baltic and the North Sea. The model successfully retraces the essential ventilation dynamics throughout the period 1961-2007. A suite of idealized experiments suggests that rising sea level is associated with intensified ventilation as saltwater inflows become stronger, longer, and more frequent. Expressed quantitatively as a salinity increase in the deep central Baltic Sea, we find that a sea level rise of 1 m triggers a saltening of more than 1 PSU. This substantial increase in ventilation is the consequence of the increasing cross section in the Danish Straits amplified by a reduction of vertical mixing.

National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
urn:nbn:se:smhi:diva-1940 (URN)10.1002/2014JC010642 (DOI)000365539700004 ()
Available from: 2016-04-29 Created: 2016-03-03 Last updated: 2018-01-10Bibliographically approved
Hordoir, R., Dieterich, C., Basu, C., Dietze, H. & Meier, M. (2013). Freshwater outflow of the Baltic Sea and transport in the Norwegian current: A statistical correlation analysis based on a numerical experiment. Continental Shelf Research, 64, 1-9
Open this publication in new window or tab >>Freshwater outflow of the Baltic Sea and transport in the Norwegian current: A statistical correlation analysis based on a numerical experiment
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2013 (English)In: Continental Shelf Research, ISSN 0278-4343, E-ISSN 1873-6955, Vol. 64, p. 1-9Article in journal (Refereed) Published
Abstract [en]

Based on the results of a numerical ocean model, we investigate statistical correlations between wind forcing, surface salinity and freshwater transport out of the Baltic Sea on one hand, and Norwegian coastal current freshwater transport on the other hand. These correlations can be explained in terms of physics and reveal how the two freshwater transports are linked with wind forcing, although this information proves to be non-sufficient when it comes to the dynamics of the Norwegian coastal current. Based on statistical correlations, the Baltic Sea freshwater transport signal is reconstructed and shows a good correlation but a poor variability when compared with the measured signal, at least when data filtered on a two-daily time scale is used. A better variability coherence is reached when data filtered on a weekly or monthly time scale is used. In the latest case, a high degree of precision is reached for the reconstructed signal. Using the same kind of methods for the case of the Norwegian coastal current, the negative peaks of the freshwater transport signal can be reconstructed based on wind data only, but the positive peaks are under-represented although some of them exist mostly because the meridional wind forcing along the Norwegian coast is taken into account. Adding Norwegian coastal salinity data helps improving the reconstruction of the positive peaks, but a major improvement is reached when adding non-linear terms in the statistical reconstruction. All coefficients used to re-construct both freshwater transport signals are provided for use in European Shelf or climate modeling configurations. (c) 2013 Elsevier Ltd. All rights reserved.

Keywords
Baltic Sea, Norwegian coastal current, Freshwater fluxes, Numerical model, Statistical reconstruction
National Category
Oceanography, Hydrology and Water Resources
Research subject
Oceanography
Identifiers
urn:nbn:se:smhi:diva-358 (URN)10.1016/j.csr.2013.05.006 (DOI)000322805000001 ()
Available from: 2015-04-10 Created: 2015-03-31 Last updated: 2018-01-11Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0931-8707

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