TY - JOUR

T1 - Quasi-permanent mushroom-like dipole in the Lofoten Basin

AU - Travkin, Vladimir S.

AU - Belonenko, Tatyana V.

AU - Budyansky, Maxim V.

AU - Prants, Sergey V.

AU - Uleysky, Michael Yu.

AU - Gnevyshev, Vladimir G.

AU - Raj, Roshin P.

N1 - Publisher Copyright: © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

PY - 2021/12/22

Y1 - 2021/12/22

N2 - 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 · 10 - 3÷ 2.8 · 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.

AB - 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 · 10 - 3÷ 2.8 · 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.

KW - Dipole

KW - GLORYS12V1

KW - lagrangian map

KW - lofoten Basin

KW - modon

KW - mushroom-like structure

KW - FRONTS

KW - OCEAN

KW - BAROCLINIC INSTABILITY

KW - DYNAMICS

KW - MECHANISMS

KW - VORTEX

UR - http://www.scopus.com/inward/record.url?scp=85121477539&partnerID=8YFLogxK

U2 - 10.1007/s00024-021-02922-9

DO - 10.1007/s00024-021-02922-9

M3 - Article

JO - Pure and Applied Geophysics

JF - Pure and Applied Geophysics

SN - 0033-4553

ER -