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On the advection of tracer by eddies on the beta-plane: A numerical study

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Show simple item record Benilov, Eugene 2017-11-01T10:40:48Z 2017-11-01T10:40:48Z 1999
dc.description peer-reviewed en_US
dc.description.abstract The evolution of tracer "injected" into an equivalent barotropic eddy on the beta-plane is examined numerically. The eddy is governed by the standard quasigeostrophic equation, and the concentration of tracer is governed by the advection equation with diffusion. At the initial moment of time, the streamfunction and distribution of tracer arc both radially or elliptically symmetric. After the first 10-30 days, a spirallike strip, where the gradient of concentration is large, develops in the tracer field, whereas the eddy' remains smooth for a relatively long time. To put this conclusion in quantitative terms, a"tracer variability indicator" is introduced and shmvIl to grow much faster than a similar characteristic of the potential vorticity field (notwithstanding the fact that the tracer concentration and PV satisfy the same governing equation). A simple explanation as to why the tracer is more affected by filamentat ion than PV is provided for eddies with small Burger number. It is demonstrated that the high-gradient strip develops, unless stopped by turbulent diffusion, into an inversion (non-monotonicity) of the tracer concentration field. Finally, the results of simulations are compared to the spiral patterns in the real-life eddies observed in the East Australian Current. en_US
dc.language.iso eng en_US
dc.publisher European Geosciences Union (EGU) International en_US
dc.relation.ispartofseries Nonlinear Processes in Geophysics;6, (2), pp. 67-77
dc.subject advection en_US
dc.subject tracer en_US
dc.subject eddies on the beta-plane en_US
dc.subject numerical en_US
dc.title On the advection of tracer by eddies on the beta-plane: A numerical study en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.5194/npg-6-67-1999
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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