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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Mar. Sci. | doi: 10.3389/fmars.2019.00725

Lagrangian Residence Time in the Bay of Gdansk, Baltic Sea

  • 1Biological Oceanography, Leibniz Institute for Baltic Sea Research (LG), Germany
  • 2Leibniz Institute for Baltic Sea Research (LG), Germany

The impact of synoptic scale and mesoscale variability on the Lagrangian residence time (LRT) of the surface water in the Bay of Gdansk was investigated using the results from an eddy-resolving model. The computed LRT of 53–60 days was up to four times longer than the estimated flushing time reported by Witek et al. (2003). The highest residence times were those of Puck Bay and near the coast, below 50 m water depth, especially during the winter. These sites also had the highest annual mean in LRT. During the summer, when the level of biological activity is high, the LRT distribution was very heterogeneous and patchy, possibly due to the eddy field and to variable wind forcing. Long-term run tracking of the inflowing water from the Vistula River showed a broad spectrum of tracer distribution. The potential impact of a much higher LRT on the near-coastal nitrogen cycle, coastal filter function and genetic differentiation is discussed, and the consequences for coastal zone management are considered. The incorporation of residence time into the Marine Strategy Framework Directive descriptors would result in an improved, unbiased evaluation of good environmental status.

Keywords: Lagrangian residence time, Nitrogen Cycle, Coastal filter, genetic differentiation, coastal zone management, Bay of Gdansk, Baltic Sea

Received: 14 Mar 2019; Accepted: 08 Nov 2019.

Copyright: © 2019 Dippner, Bartl, Chrysagi, Holtermann, Kremp, Thoms and Voss. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Dr. Joachim W. Dippner, Leibniz Institute for Baltic Sea Research (LG), Biological Oceanography, Warnemünde, D-18119, Germany, dippner@io-warnemuende.de