Tracer anomaly evolution in the flow field of an isolated eddy |
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| Authors: | Greg Holloway Stephen C. Riser David Ramsden |
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| Affiliation: | 1. Institute of Ocean Sciences, Sidney, B.C. Canada;7. School of Oceanography, University of Washington, Seattle, WA U.S.A.;71. Interact Computing Services, Sidney, B.C. Canada;1. International Arctic Research Center, University of Alaska Fairbanks, PO Box 757340, Fairbanks, AK, 99775, USA;2. North Pacific Research Board, 1007 West Third Avenue, Anchorage, AK, 99501, USA;3. Alaska Fisheries Science Center, NOAA, 7600 Sand Point Way NE, Seattle, WA, 98115, USA;4. Departamento de Geofísica, Universidad de Concepción, Casilla 160-C, Concepción, Chile;5. Institute of Marine Science, University of Alaska, Fairbanks, AK, 99775-7220, USA;6. Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, 98195, USA;7. Fisheries Behavioral Ecology Program, Alaska Fisheries Science Center, NOAA – NMFS, Hatfield Marine Science Center, Newport, OR, 97365, USA;8. School of Aquatic and Fishery Sciences, University of Washington, 1122 Boat St, Seattle, WA, 98105, USA;1. Center for Molecular Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA;2. Department of Biomedical Engineering, Boston University, Boston, MA, USA;3. Institute of Molecular Systems Biology, ETH Zurich, Zurich, Switzerland;4. Systems Biology Graduate School, Zurich 8057, Switzerland;5. Bioinformatics Program, Boston University, Boston, MA, USA;6. Department of Biology, Boston University, Boston, MA, USA;7. Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA;1. University of Bordeaux, France;2. University of Sydney, HPS, Carslaw Building, NSW, 2006, Australia;3. University of Auckland, Philosophy, School of Humanities, Room 538, Level 5, 14A Symonds St, Auckland, 1010, New Zealand |
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| Abstract: | We explore the horizontal stirring of a passive tracer field in the vicinity of an isolated, finite amplitude, quasigeostrophic, β-plane eddy. We consider stirring in the presence of a uniform background gradient of tracer concentration as well as cases in which the tracer anomaly is initially contained within the eddy.This paper reports a survey of phenomenology based upon numerical experiments. We explore the sensitivity of results to physical parameters and to various aspects of the numerical simulation.Under the joint effects of β and of non-linearity, the eddy center migrates. Time dependent effects in a radiated wake provide important stirring mechanisms for the background tracer field. An unexpected, persistent result is a tendency to propel a tendril of tracer westward from near the launch latitude of the eddy. In some cases, the westward penetration of the tendril is even further than the migration of the eddy center.Tracer properties characteristics of the launch site of the eddy tend to be captured and carried with the eddy. However, tracer leaks from the eddy, due to both explicit diffusion-like effects and eddy interaction with background flow features, can result in drawing off of secondary tracer patches.We also calculate trajectories of Lagrangian particles launched in and around the eddy. |
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