Detection of coherent oceanic structures via transfer operators

被引:100
作者
Froyland, Gary [1 ]
Padberg, Kathrin
England, Matthew H.
Treguier, Anne Marie
机构
[1] Univ New S Wales, Sch Math & Stat, Sydney, NSW 2052, Australia
[2] Univ Paderborn, Fak Elektortech Informat & Math, D-33095 Paderborn, Germany
[3] IFREMER, CNRS, F-29280 Plouzane, France
关键词
D O I
10.1103/PhysRevLett.98.224503
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Coherent nondispersive structures are known to play a crucial role in explaining transport in nonautonomous dynamical systems such as ocean flows. These structures are difficult to extract from model output as they are Lagrangian by nature and not revealed by the underlying Eulerian velocity fields. In the last few years heuristic concepts such as finite-time Lyapunov exponents have been used in an attempt to detect barriers to oceanic transport and thus identify regions that trap material such as nutrients and phytoplankton. In this Letter we pursue a novel, more direct approach to uncover coherent regions in the surface ocean using high-resolution model velocity data. Our method is based upon numerically constructing a transfer operator that controls the surface transport of particles over a short period. We apply our technique to the polar latitudes of the Southern Ocean.
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