How reliable are finite-size Lyapunov exponents for the assessment of ocean dynamics?

被引：90

作者：

Hernandez-Carrasco, Ismael ^{[1
]}

Lopez, Cristobal ^{[1
]}

Hernandez-Garcia, Emilio ^{[1
]}

Turiel, Antonio ^{[2
]}

机构：

[1] CSIC UIB, Inst Fis Interdisciplinar & Sistemas Complejos, IFISC, Palma De Mallorca 07122, Spain

[2] CSIC, Inst Ciencies Mar, E-08003 Barcelona, Spain

来源：

OCEAN MODELLING | 2011年 / 36卷 / 3-4期

关键词：

Lagrangian methods; Finite-size Lyapunov exponents; LAGRANGIAN COHERENT STRUCTURES; MEDITERRANEAN SEA; 2-DIMENSIONAL TURBULENCE; RELATIVE DISPERSION; VELOCITY-FIELDS; PASSIVE TRACERS; POLAR VORTEX; TRANSPORT; MODEL; TRAJECTORIES;

D O I：

10.1016/j.ocemod.2010.12.006

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Much of atmospheric and oceanic transport is associated with coherent structures. Lagrangian methods are emerging as optimal tools for their identification and analysis. An important Lagrangian technique which is starting to be widely used in oceanography is that of finite-size Lyapunov exponents (FSLEs). Despite this growing relevance there are still many open questions concerning the reliability of the FSLEs in order to analyse the ocean dynamics. In particular, it is still unclear how robust they are when confronted with real data. In this paper we analyze the effect on this Lagrangian technique of the two most important effects when facing real data, namely noise and dynamics of unsolved scales. Our results, using as a benchmark data from a primitive numerical model of the Mediterranean Sea, show that even when some dynamics is missed the FSLEs results still give an accurate picture of the oceanic transport properties. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：208 / 218

页数：11

共 35 条

[1]

[Anonymous], 1993, CHAOS DYNAMICAL SYST

[2] Dispersion of passive tracers in closed basins: Beyond the diffusion coefficient [J].

Artale, V ;

Boffetta, G ;

Celani, A ;

Cencini, M ;

Vulpiani, A .

PHYSICS OF FLUIDS, 1997, 9 (11) :3162-3171

[3] Predictability in the large: An extension of the concept of Lyapunov exponent [J].

Aurell, E ;

Boffetta, G ;

Crisanti, A ;

Paladin, G ;

Vulpiani, A .

JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1997, 30 (01) :1-26

[4] Oceanic mesoscale eddies as revealed by Lagrangian coherent structures [J].

Beron-Vera, F. J. ;

Olascoaga, M. J. ;

Goni, G. J. .

GEOPHYSICAL RESEARCH LETTERS, 2008, 35 (12)

[5] Detecting barriers to transport: a review of different techniques [J].

Boffetta, G ;

Lacorata, G ;

Radaelli, G ;

Vulpiani, A .

PHYSICA D-NONLINEAR PHENOMENA, 2001, 159 (1-2) :58-70

[6] Dispersion processes and residence times in a semi-enclosed basin with recirculating gyres: An application to the Tyrrhenian Sea [J].

Buffoni, G ;

Falco, P ;

Griffa, A ;

Zambianchi, E .

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 1997, 102 (C8) :18699-18713

[7] Mixing structures in the Mediterranean Sea from finite-size Lyapunov exponents -: art. no. L17203 [J].

d'Ovidio, F ;

Fernández, V ;

Hernández-García, E ;

López, C .

GEOPHYSICAL RESEARCH LETTERS, 2004, 31 (17) :L172031-4

[8] Comparison between Eulerian diagnostics and finite-size Lyapunov exponents computed from altimetry in the Algerian basin [J].

d'Ovidio, Francesco ;

Isern-Fontanet, Jordi ;

Lopez, Cristobal ;

Hernandez-Garcia, Emilio ;

Garcia-Ladona, Emilio .

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 2009, 56 (01) :15-31

[9]

Falconer KJ, 1999, Fractal geometry: mathematical foundations and applications

[10] Mesoscale, seasonal and interannual variability in the Mediterranean Sea using a numerical ocean model [J].

Fernández, V ;

Dietrich, DE ;

Haney, RL ;

Tintoré, J .

PROGRESS IN OCEANOGRAPHY, 2005, 66 (2-4) :321-340

← 1 2 3 4 →