### Abstract

In order to determine the effect of Eulerian spatial resolution on the two particle statistics of synthetic drifter trajectories, we examine a hierarchy of ocean models, starting from 2D turbulence simulations, progressing to idealized simulations of a buoyant coastal jet with ROMS, and finally to realistic HYCOM simulations of the Gulf Stream. In each case, particle dispersion at large time and space scales is found to be controlled by energetic meso-scale features of the flow that are relatively insensitive to the resolution of finer scale motions. In all cases, time-distance graphs given in terms of computed Finite Scale Lyapunov Exponents show an expected increase in the extent of exponential scaling with increasing spatial smoothing of the velocity field. The limiting value of the FSLE at small separation distances is found to scale remarkably well with the resolution of Eulerian velocity gradients as given by the average of positive Okubo-Weiss parameter values.

Original language | English (US) |
---|---|

Pages (from-to) | 36-50 |

Number of pages | 15 |

Journal | Ocean Modelling |

Volume | 31 |

Issue number | 1-2 |

DOIs | |

State | Published - 2010 |

### Fingerprint

### Keywords

- Dispersion
- Lagrangian

### ASJC Scopus subject areas

- Computer Science (miscellaneous)
- Atmospheric Science
- Geotechnical Engineering and Engineering Geology
- Oceanography

### Cite this

*Ocean Modelling*,

*31*(1-2), 36-50. https://doi.org/10.1016/j.ocemod.2009.09.002

**Resolution dependent relative dispersion statistics in a hierarchy of ocean models.** / Poje, Andrew C.; Haza, Angelique C.; Ozgokmen, Tamay M; Magaldi, Marcello G.; Garraffo, Zulema D.

Research output: Contribution to journal › Article

*Ocean Modelling*, vol. 31, no. 1-2, pp. 36-50. https://doi.org/10.1016/j.ocemod.2009.09.002

}

TY - JOUR

T1 - Resolution dependent relative dispersion statistics in a hierarchy of ocean models

AU - Poje, Andrew C.

AU - Haza, Angelique C.

AU - Ozgokmen, Tamay M

AU - Magaldi, Marcello G.

AU - Garraffo, Zulema D.

PY - 2010

Y1 - 2010

N2 - In order to determine the effect of Eulerian spatial resolution on the two particle statistics of synthetic drifter trajectories, we examine a hierarchy of ocean models, starting from 2D turbulence simulations, progressing to idealized simulations of a buoyant coastal jet with ROMS, and finally to realistic HYCOM simulations of the Gulf Stream. In each case, particle dispersion at large time and space scales is found to be controlled by energetic meso-scale features of the flow that are relatively insensitive to the resolution of finer scale motions. In all cases, time-distance graphs given in terms of computed Finite Scale Lyapunov Exponents show an expected increase in the extent of exponential scaling with increasing spatial smoothing of the velocity field. The limiting value of the FSLE at small separation distances is found to scale remarkably well with the resolution of Eulerian velocity gradients as given by the average of positive Okubo-Weiss parameter values.

AB - In order to determine the effect of Eulerian spatial resolution on the two particle statistics of synthetic drifter trajectories, we examine a hierarchy of ocean models, starting from 2D turbulence simulations, progressing to idealized simulations of a buoyant coastal jet with ROMS, and finally to realistic HYCOM simulations of the Gulf Stream. In each case, particle dispersion at large time and space scales is found to be controlled by energetic meso-scale features of the flow that are relatively insensitive to the resolution of finer scale motions. In all cases, time-distance graphs given in terms of computed Finite Scale Lyapunov Exponents show an expected increase in the extent of exponential scaling with increasing spatial smoothing of the velocity field. The limiting value of the FSLE at small separation distances is found to scale remarkably well with the resolution of Eulerian velocity gradients as given by the average of positive Okubo-Weiss parameter values.

KW - Dispersion

KW - Lagrangian

UR - http://www.scopus.com/inward/record.url?scp=70350617655&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70350617655&partnerID=8YFLogxK

U2 - 10.1016/j.ocemod.2009.09.002

DO - 10.1016/j.ocemod.2009.09.002

M3 - Article

VL - 31

SP - 36

EP - 50

JO - Ocean Modelling

JF - Ocean Modelling

SN - 1463-5003

IS - 1-2

ER -