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On the variability in the onset of the Norwegian Coastal Current

Journal article
Authors Kai Håkon Christensen
Ann Kristin Sperrevik
Göran Broström
Published in Journal of Physical Oceanography
Volume 48
Pages 723-738
ISSN 0022-3670
Publication year 2018
Published at Department of marine sciences
Pages 723-738
Language en
Links doi.org/10.1175/JPO-D-17-0117.1
Keywords Coastal flows, Data assimilation, In situ oceanic observations, Radars/Radar observations, Satellite observations
Subject categories Oceanography

Abstract

© 2018 American Meteorological Society. A high-resolution reanalysis of the circulation in the Kattegat and Skagerrak is used to investigate the mechanisms that control the variability in the onset of the Norwegian Coastal Current. In the reanalysis, the authors have used all available in situ and remote sensing observations of salinity and temperature and use surface current observations from two coastal high-frequency radars that were ideally placed to monitor the exchange between the two basins. This study finds a strong correlation between the variability in the wind forcing in the Skagerrak and the transport in the Norwegian Coastal Current through the Torungen-Hirtshals section. Two cases with winds into and out of the Skagerrak are studied in more detail, and the results suggest asymmetries in the forcing mechanisms. For winds out of the Skagerrak, strong outflows of Baltic Sea Water associated with a deflection of the Kattegat-Skagerrak Front may disrupt local processes in the Skagerrak, which is not accounted for in previously published conceptual models for the variability of the coastal currents in this region.

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