Preprints
https://doi.org/10.5194/os-2021-41
https://doi.org/10.5194/os-2021-41

  26 May 2021

26 May 2021

Review status: this preprint is currently under review for the journal OS.

Rectified tidal transport in Lofoten-Vesterålen, Northern Norway

Eli Børve1,2, Pål Erik Isachsen1,3, and Ole Anders Nøst4,5 Eli Børve et al.
  • 1Department of Geosciences, University of Oslo, 0315 Oslo, Norway
  • 2Akvaplan-niva AS, 9296 Tromsø, Norway
  • 3The Norwegian Meteorological Institute, 0371 Oslo, Norway
  • 4Faculty of Biosciences and Aquaculture, Nord University, 8026 Bodø, Norway
  • 5Akvaplan-niva AS, 7462 Trondheim, Norway

Abstract. Vestfjorden in Northern Norway, a major spawning ground for the Northeast Arctic cod, is sheltered from the continental shelf and open ocean by the Lofoten-Vesterålen archipelago. The archipelago, however, is well known for hosting strong and vigorous tidal currents in its many straits, currents that can produce significant time-mean tracer transport from Vestfjorden to the shelf outside. We use a purely tidally-driven unstructured-grid ocean model to look into the nonlinear tidal dynamics and the associated tracer transport through the archipelago. Of particular interest are two processes: tidal pumping through the straits and tidal rectification around islands. The most prominent tracer transport is caused by tidal pumping through the short and strongly nonlinear straits Nordlandsflaget and Moskstraumen near the southern tip of the archipelago. Here tracers from Vestfjorden are transported tens of kilometers westward out on the outer shelf. Further north, weaker yet notable tidal pumping also takes place through the longer straits Nappstraumen and Gimsøystraumen. The other main transport route out of Vestfjorden is south of the island of Røst. Here the transport is primarily due to tracer advection by rectified anticyclonic currents around the island. There is also an anticyclonic circulation cell around the islands of Mosken-Værøy, and both cells have have flow speeds up to 0.2 m/s, magnitudes similar to the observed background currents in the region. These high-resolution simulations thus emphasize the importance of nonlinear tidal dynamics for transport of cod eggs and larvae in the region.

Eli Børve et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-41', Anonymous Referee #1, 25 Jun 2021
    • AC1: 'Reply on RC1', Eli Børve, 12 Jul 2021
  • RC2: 'Comment on os-2021-41', Anonymous Referee #2, 11 Jul 2021
    • AC2: 'Reply on RC2', Eli Børve, 18 Aug 2021
    • AC3: 'Reply on RC2', Eli Børve, 23 Aug 2021

Eli Børve et al.

Eli Børve et al.

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Short summary
Nonlinear tidal dynamics can produce prominent time-mean transports in coastal regions where strong tidal currents interact with topography. We investigate tidal induced transports using a tidally-driven ocean model for Lofoten-Vesterålen in northern-Norway and find that both tidal pumping and tidal rectification can play an important role for time-mean transports in the region. The study emphasizes the importance of nonlinear tidal dynamics for time-mean transports in complex coastal regions.