Water cooling in the entrance of the Baltic Sea

Anders Omstedt

doi:10.3402/tellusa.v39i3.11758

Water cooling in the entrance of the Baltic Sea

Tellus

Volume 39 (1987): Issue 3

By: Anders Omstedt

Open Access

|Jan 1987

Abstract

Water cooling in the entrance of the Baltic Sea is analyzed using measured and numerically simulated data. The measurements cover two cooling periods from the prelude of the severe sea ice winters 1984/85 and 1985/86, during which the surface water was cooled from 10°C to freezing. The calculations are based upon a mathematical model which divides the entrance of the Baltic Sea into four sub-basins: the Kattegat, the Belt Sea, Öresund and the Arkona Basin. In each sub-basin, the conservation equations for momentum, heat and salt in the vertical dimension are solved with vertical mean velocities based upon parameterized in- and outflows. The turbulent exchange coefficients are calculated using a two-equation model of turbulence.

The measured data demonstrate the importance of considering the exchange through the entrance of the Baltic Sea when modelling autumn cooling. The mathematical model describes the exchange and the general development of the cooling in a satisfactory way.

References

Caldwell , D. R . 1978 . The maximum density points of pure and saline water . Deep-Sea Res . 25 , 175 – 181 .
Search in Google Scholar Back to article
Cederlöf , U. and Djurfeldt , L . 1977 . Simultaneous observations of current field and hydrography in Öresund during six days in autumn 1976. Report No. 19 , Institute of Oceanography, University of Gothen-burg , Gothenburg, Sweden.
Search in Google Scholar Back to article
Ehlin , U. , Mattisson , I. and Zachrisson , G . 1974 . Computer-based calculations of volumes of the Baltic Area. 9th Conf . Bait. Ocean, Kiel , 7 , 14 pp.
Search in Google Scholar Back to article
Jacobsen , T. S . 1980 . Sea water exchange of the Baltic, measurements and methods. Belt Project , National Agency of Environment Protection , Denmark , 706 pp.
Search in Google Scholar Back to article
Kullenberg , G . 1981 . Physical oceanography. In The Baltic Sea (ed. A. Voipio ). Elsevier , 135 – 181 .
Search in Google Scholar Back to article
Lundberg , P . 1983 . On the mechanics of the deep-water flow in the Bornholm Channel . Tellus 35A , 149 – 158 .
Search in Google Scholar Back to article
Matthäus , W . 1985 . Annual and long-term mean changes of the salinity in the Arkona Basin. ( In German. ) Beitr. Meereskd. , Heft 53, 17 – 26 , Berlin.
Search in Google Scholar Back to article
Omstedt , A . 1983 . On autumn cooling in the Gulf of Bothnia . Geophysica 20 , No. 1 , 27 – 40 .
Search in Google Scholar Back to article
Omstedt , A . 1984 . A forecast model for water cooling in the Gulf of Bothnia and Lake Vänem. SMHI-Reports, no. RHO 36. The Swedish Hydrological and Meteorological Institute (SMHI), S-601 76 Norrköping, Sweden.
Search in Google Scholar Back to article
Omstedt , A. , Sahlberg , J. and Svensson , U . 1983 . Measured and numerically simulated autumn cooling in the Bay of Bothnia . Tellus 35A , 231 – 240 .
Search in Google Scholar Back to article
Petrén , O. and Walin , G . 1976 . Some observations of the deep flow in the Bornholm Strait during the period June 1973—December 1974 . Tellus 28 , 74 – 87 .
Search in Google Scholar Back to article
Rodi , W . 1980 . Turbulence models and their application in hydraulics a state of the art review. Report from the IAHR Section of Fundamentals of Division II: Experimental and Mathematical Fluid Dynamics , pp. 1 – 104 . Secretariat: Rotterdamseweg 185, P.O. Box 177,2600 MH Delft , The Netherlands.
Search in Google Scholar Back to article
Stigebrandt , A . 1980 . Barotropic and baroclinic response of a semi-enclosed basin to barotropic forcing from the sea. In Fjord oceanography (eds. H. J. Freeland , D. M. Farmer and C. D. Levings ). Plenum, New York, USA , 141 – 164 .
Search in Google Scholar Back to article
Stigebrandt , A . 1983 . A model for the exchange of water and salt between the Baltic and the Skagerrak . J. Phys. Oceanogr . 13 , 411 – 427 .
Search in Google Scholar Back to article
Svansson , A . 1975 . Physical and chemical oceanography of the Skagerrak and the Kattegat. Rep. No. 1, Fish, Bd., Sweden, Inst. Mar. Res. , 88 pp.
Search in Google Scholar Back to article
Svansson , A . 1984 . Hydrographic features of the Kattegat. Rapp. P.v. Réun. Cons. Int . Explor. Mer , 185 : 78 – 90 .
Search in Google Scholar Back to article
Svensson , U . 1979 . The structure of the turbulent Ekman layer . Tellus 31 , 340 – 350 .
Search in Google Scholar Back to article
Svensson , U . 1986 . PROBE—An instruction manual. Report Oceanography No. 10 , The Swedish Meteoro-logical and Hydrological Institute (SMHI), S-601 76 Norrkoping , Sweden , 90 pp.
Search in Google Scholar Back to article
Swedish Administration of Shipping and Navigation , 1982 . Climatological ice atlas for the Baltic Sea, Kattegat, Skagerrak and Lake Viinern , 1963 – 1979 . S-601 78, Norrkoping , Sweden , 220 pp.
Search in Google Scholar Back to article