Evolution of intrathermocline eddies moving over a submarine hill |
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Authors: | Filyushkin B N Sokolovskiy M A Kozhelupova N G Vagina I M |
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Institution: | 1.Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia ;2.Water Problems Institute, Russian Academy of Sciences, Moscow, Russia ;3.Faculty of Geography, Moscow State University, Vorob’evy gory, Moscow, Russia ; |
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Abstract: | Anticyclonic and cyclonic mediterranean eddies are formed on continental slopes of the Iberian Peninsula. Cyclonic eddies
commonly live for 0.5–1 year at most. Anticyclonic eddies (meddies) live for 4–5 years, on average, but there are eddies of
7–8 years in age drifting at the distance of up to 6000 km from the region of its formation. According to the results of observations,
in some regions of the Atlantic Ocean, the meddies are destructed partially or completely after contact with submarine mountains.
However, it is impossible to trace evolution of the lens moving over the submarine obstacle by the field data. We studied
the modeled influence of variable-height submarine hills on movement of cyclonic and anticyclonic intrathermocline eddies
by the contour dynamics method. The evolution of lenses appeared to be quite sensitive to variations in hill height. Cyclonic
and anticyclonic lenses interact with the hill in different ways. The data of unique field observations of Mediterranean lenses
in the North Atlantic are confirmed by the results of our model experiments. Hence, it is possible to predict basic, similar
to real, scenarios of interaction of intrathermocline eddies under conditions of complex bottom relief in the context of the
three-layered ocean model. |
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