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MISU research seminar | Johannes Sandang

Mass exchange of Atlantic Water with the Lofoten Basin derived from high-resolution Lagrangian simulations and Eulerian models

by Research seminar, Johannes Sandang Dugstad, University of Bergen, Norway (visiting PhD student)

Time: 13 June 2019, 14h15–14h45
Venue: Rossbysalen C609, Arrhenius Laboratory, 6th floor

Abstract
The Atlantic Water in the Nordic Seas undergoes a substantial cooling and densification as it flows northwards towards the Arctic. The largest water mass transformation is observed to take place in the topographical depression west of the continental slope of Norway, the Lofoten Basin, due to a retention of relatively warm Atlantic Water which results in large surface heat losses. The Atlantic Water inflow to the basin has been previously attributed to mesoscale eddies that drift into the basin from the eastern continental slope. However, the spatial distribution, vertical structure and seasonal variations of the inflow has not been yet quantified. To address this issue, we first analyze historical surface drifter trajectories as well as volume and heat transport from an eddy-permitting ocean model (ROMS). We find that warm water is mainly entering the Lofoten Basin from the south at surface, while at deeper levels heat is transported into the basin by the help of eddy fluxes from the east. Next, we analyze a largest-to date deployment of 2D and 3D Lagrangian particles in the region integrated using output from a dedicated high-resolution ROMS model simulation. We estimate key regions of the inflow, identify the typical characteristics of these water masses and study how these characteristics changes geographically around the basin. In addition, we compare how the vertical and seasonal signal is represented in the 2D and 3D simulations.

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