Abstract
Studies of satellite images reveal the existence of dipole structures in the Global Ocean, which look like mushrooms. Usually, the mushroom-like dipole is represented by a jet that plays a role in its generation called the “stem” (jet), ending in two vortices of opposite polarity called the “cap”. The Lofoten Basin in the Norwegian Sea is rich in mushroom-like dipoles with a life span of some weeks. We use the GLORYS12V1 reanalysis data to study the evolution of one of them and apply the method of Lagrangian modelling for the sea surface and the horizon at 541 m, which usually corresponds to the middle of mesoscale-eddy vertical extent in the Lofoten Basin. The analysis reveals the mushroom-shaped dipole located in the east part of the Lofoten Basin. We analyze its evolution for the period from 4 October to 5 November 2013. This mushroom-shaped dipole has a width of “cap” of 170 km, the length is 150 km, and the “stem” width varies in the range of 40–60 km. The Burger number has been estimated to be \(Bu = 1.6 \cdot 10^{ - 3} \div 2.8 \cdot 10^{ - 3}\). It means that stratification affects the generation and evolution of the mushroom-shaped dipole less than other hydrodynamic factors determining its evolution. We also suppose that this mushroom-shaped dipole has a topographic nature in the Lofoten Basin because it is formed on the topographic slope with a strong topography gradient.
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Acknowledgements
The work was carried out at the financial support of the SPBU grant No. 75295423 and the RFBR grant No. 20-05-00066. The work of MVB, SVP, and MYuU on Lagrangian simulation was carried out in the framework of the State Task No.121021700341-2 at the POI FEBRAS.
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Travkin, V.S., Belonenko, T.V., Budyansky, M.V. et al. Quasi-Permanent Mushroom-like Dipole in the Lofoten Basin. Pure Appl. Geophys. 179, 465–482 (2022). https://doi.org/10.1007/s00024-021-02922-9
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DOI: https://doi.org/10.1007/s00024-021-02922-9