The air-sea transformation and residual overturning circulation within the Nordic Seas

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Abstract:

The residual diapycnal overturning circulation through interior regions of the Nordic Seas is diagnosed. The mean flow is estimated from Ekman dynamics and from the thermal wind relation with reference level velocities deduced from observations and from simplified theory. Eddy-induced transport is estimated from a GM-type parameterization which includes top and bottom boundary layers. The contributions from the Eulerian mean and eddy-induced transport are then compared to the annual-mean air – sea density transformation over the Nordic Seas. The calculations suggest that the mean flow overturning may explain up to 25% of the observed air – sea transformation in the Lofoten-Norwegian Sea basins. But, over all, eddy-induced overturning must dominate the transport of buoyancy and heat into these interior regions, and the eddy parameterization used here is able to explain most of the density transformation rates. The calculations generally support previous claims that small-scale mixing is of secondary importance in high-latitude regions such as this, but they also open for the existence of a deep mixing-driven overturning cell between the eastern and western parts of the Nordic Seas.

Document Type: Research Article

DOI: http://dx.doi.org/10.1357/002224012800502372

Publication date: January 1, 2012

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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