Oceanic three-dimensional Lagrangian coherent structures: A study of a mesoscale eddy in the Benguela upwelling region

被引：52

作者：

Bettencourt, Joao H. ^{[1
]}

Lopez, Cristobal ^{[1
]}

Hernandez-Garcia, Emilio ^{[1
]}

机构：

[1] IFISC, CSIC UIB, E-07122 Palma de Mallorca, Spain

来源：

OCEAN MODELLING | 2012年 / 51卷

关键词：

Lagrangian coherent structures; Finite-size Lyapunov exponents; Ocean transport; Benguela upwelling region; Oceanic eddy; SIZE LYAPUNOV EXPONENTS; RELATIVE DISPERSION; TRANSPORT; COASTAL; FLOWS; MODEL; PREDICTABILITY; STATISTICS; COORDINATE; DYNAMICS;

D O I：

10.1016/j.ocemod.2012.04.004

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

We study three dimensional (3D) oceanic Lagrangian coherent structures (LCSs) in the Benguela upwelling region obtained from an output of the regional ocean modeling system (ROMS). To do that, we first computed finite-size Lyapunov exponent (FSLE) fields in the region volume that characterize mesoscale stirring and mixing. Average FSLE values generally decreased with depth, but there was a local maximum at a depth of approximately 100 m. LCSs are extracted as the ridges of the calculated FSLE fields. They present a "curtain-like" geometry in which the strongest attracting and repelling structures appear as quasivertical surfaces. LCSs around a particular cyclonic eddy, pinched off from the upwelling front, are also calculated. The LCSs are confirmed to provide pathways and barriers to transport into and out of the eddy. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：73 / 83

页数：11

共 63 条

[21] Lagrangian coherent structures and mixing in two-dimensional turbulence [J].

Haller, G ;

Yuan, G .

PHYSICA D, 2000, 147 (3-4) :352-370

[22] A variational theory of hyperbolic Lagrangian Coherent Structures [J].

Haller, George .

PHYSICA D-NONLINEAR PHENOMENA, 2011, 240 (07) :574-598

[23] Relative dispersion from a high-resolution coastal model of the Adriatic Sea [J].

Haza, Angelique C. ;

Poje, Andrew C. ;

Ozgokmen, Tarnay M. ;

Martin, Paul .

OCEAN MODELLING, 2008, 22 (1-2) :48-65

[24] Transport properties in small-scale coastal flows: relative dispersion from VHF radar measurements in the Gulf of La Spezia [J].

Haza, Angelique C. ;

Ozgokmen, Tamay M. ;

Griffa, Annalisa ;

Molcard, Anne ;

Poulain, Pierre-Marie ;

Peggion, Germana .

OCEAN DYNAMICS, 2010, 60 (04) :861-882

[25] How reliable are finite-size Lyapunov exponents for the assessment of ocean dynamics? [J].

Hernandez-Carrasco, Ismael ;

Lopez, Cristobal ;

Hernandez-Garcia, Emilio ;

Turiel, Antonio .

OCEAN MODELLING, 2011, 36 (3-4) :208-218

[26]

Hunt J. C., 1988, STUDYING TURBULENCE, DOI DOI 10.1002/CTR-S88

[27] ON THE IDENTIFICATION OF A VORTEX [J].

JEONG, J ;

HUSSAIN, F .

JOURNAL OF FLUID MECHANICS, 1995, 285 :69-94

[28]

Joseph B, 2002, J ATMOS SCI, V59, P1198, DOI 10.1175/1520-0469(2002)059<1198:RBKBSA>2.0.CO

[29]

[30] The Oceanic Vertical Pump Induced by Mesoscale and Submesoscale Turbulence [J].

Klein, Patrice ;

Lapeyre, Guillaume .

ANNUAL REVIEW OF MARINE SCIENCE, 2009, 1 :351-375

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