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Studying an Agulhas ring's long-term pathway and decay with finite-time coherent sets
- Source :
- Chaos: An Interdisciplinary Journal of Nonlinear Science, Chaos: An Interdisciplinary Journal of Nonlinear Science, American Institute of Physics, 2015, 25 (8), ⟨10.1063/1.4927830⟩, Chaos: An Interdisciplinary Journal of Nonlinear Science, 2015, 25 (8), ⟨10.1063/1.4927830⟩, Digital.CSIC. Repositorio Institucional del CSIC, instname
- Publication Year :
- 2015
- Publisher :
- HAL CCSD, 2015.
-
Abstract
- © 2015 AIP Publishing LLC. Coherent sets in dynamical systems are regions in phase space that optimally >carry mass> with them under the system's evolution, so that these regions experience minimal leakage. The dominant tool for determining coherent sets is the transfer operator, which provides a complete description of Lagrangian mass transport. In this work, we combine existing transfer operator methods with a windowing scheme to study the spatial and temporal evolution of a so-called Agulhas ring: a large anticyclonic mesoscale eddy playing a key role in inter-ocean exchange of climate-relevant properties. Our focus is on ring decay over time and the windowing scheme enables us to study how the most coherent region (our estimate of the ring) varies in position and size over a period of more than two years. We compare the eddy-like structure and its spatio-temporal changes as revealed by our method and by a classical Eulerian approach.<br />The altimeter products were produced by Ssalto/Duacs and distributed by Aviso, with support from CNES (http://www.aviso.oceanobs.com/duacs/). G.F. and C.H. were partially supported by the 2011/12 Go8/DAAD Australia/Germany Joint Research Co-Operation Scheme. G.F. was also supported by an ARC Future Fellowship. E.v.S. was supported by the ARC via Grant DE130101336. V.R. acknowledges support from MICINN and FEDER through the ESCOLA project (CTM2012-39025-C02-01) while finishing this paper.
- Subjects :
- DYNAMICS
010504 meteorology & atmospheric sciences
Dynamical systems theory
Mesoscale meteorology
Mathematics, Applied
General Physics and Astronomy
INVARIANT
01 natural sciences
010305 fluids & plasmas
EDDY
symbols.namesake
ATLANTIC INTEROCEAN EXCHANGE
TRACKING
LEAKAGE
OCEAN
Transfer operator
0103 physical sciences
Statistical physics
Physics::Atmospheric and Oceanic Physics
Mathematical Physics
Simulation
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Physics
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
Science & Technology
Applied Mathematics
EDDIES
Statistical and Nonlinear Physics
Eulerian path
Invariant (physics)
TRANSPORT
Physics, Mathematical
MODEL
Eddy
Phase space
Physical Sciences
symbols
Finite time
Mathematics
Subjects
Details
- Language :
- English
- ISSN :
- 10541500
- Database :
- OpenAIRE
- Journal :
- Chaos: An Interdisciplinary Journal of Nonlinear Science, Chaos: An Interdisciplinary Journal of Nonlinear Science, American Institute of Physics, 2015, 25 (8), ⟨10.1063/1.4927830⟩, Chaos: An Interdisciplinary Journal of Nonlinear Science, 2015, 25 (8), ⟨10.1063/1.4927830⟩, Digital.CSIC. Repositorio Institucional del CSIC, instname
- Accession number :
- edsair.doi.dedup.....7e7c11ec2548bf69c4a85318d33cf541