### Abstract

Motivated by increases in the realism of OGCMs and the number of drifting buoys in the ocean observing system, a new Lagrangian assimilation technique is implemented in an idealized, reduced-gravity configuration of the layered primitive equation model MICOM. Using an extensive set of twin experiments, the effectiveness of the Lagrangian observation operator and of a dynamical balancing technique for corrected model variables, which is based on geostrophy and mass conservation, are explored in comparison to a conventional Pseudo-Lagrangian observation operator and an implementation of the Kalman filter method. The results clearly illustrate that the Lagrangian observation operator is superior to the Pseudo-Lagrangian in the parameter range that is relevant for typical oceanic drifter observations, and that the simple dynamical balancing technique works well for midlatitude ocean circulation.

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

Pages (from-to) | 31 |

Number of pages | 1 |

Journal | Journal of Geophysical Research C: Oceans |

Volume | 108 |

Issue number | 7 |

State | Published - Jul 15 2003 |

### Fingerprint

### Keywords

- Data assimilation
- Drifter assimilation
- Lagrangian data assimilation
- Ocean modeling
- Ocean prediction

### ASJC Scopus subject areas

- Earth and Planetary Sciences (miscellaneous)
- Atmospheric Science
- Geochemistry and Petrology
- Geophysics
- Oceanography
- Space and Planetary Science
- Astronomy and Astrophysics

### Cite this

*Journal of Geophysical Research C: Oceans*,

*108*(7), 31.

**Assimilation of drifter observations in primitive equation models of midlatitude ocean circulation.** / Ozgokmen, Tamay M; Molcard, Anne; Chin, Toshio M.; Piterberg, Leonid I.; Griffa, Annalisa.

Research output: Contribution to journal › Article

*Journal of Geophysical Research C: Oceans*, vol. 108, no. 7, pp. 31.

}

TY - JOUR

T1 - Assimilation of drifter observations in primitive equation models of midlatitude ocean circulation

AU - Ozgokmen, Tamay M

AU - Molcard, Anne

AU - Chin, Toshio M.

AU - Piterberg, Leonid I.

AU - Griffa, Annalisa

PY - 2003/7/15

Y1 - 2003/7/15

N2 - Motivated by increases in the realism of OGCMs and the number of drifting buoys in the ocean observing system, a new Lagrangian assimilation technique is implemented in an idealized, reduced-gravity configuration of the layered primitive equation model MICOM. Using an extensive set of twin experiments, the effectiveness of the Lagrangian observation operator and of a dynamical balancing technique for corrected model variables, which is based on geostrophy and mass conservation, are explored in comparison to a conventional Pseudo-Lagrangian observation operator and an implementation of the Kalman filter method. The results clearly illustrate that the Lagrangian observation operator is superior to the Pseudo-Lagrangian in the parameter range that is relevant for typical oceanic drifter observations, and that the simple dynamical balancing technique works well for midlatitude ocean circulation.

AB - Motivated by increases in the realism of OGCMs and the number of drifting buoys in the ocean observing system, a new Lagrangian assimilation technique is implemented in an idealized, reduced-gravity configuration of the layered primitive equation model MICOM. Using an extensive set of twin experiments, the effectiveness of the Lagrangian observation operator and of a dynamical balancing technique for corrected model variables, which is based on geostrophy and mass conservation, are explored in comparison to a conventional Pseudo-Lagrangian observation operator and an implementation of the Kalman filter method. The results clearly illustrate that the Lagrangian observation operator is superior to the Pseudo-Lagrangian in the parameter range that is relevant for typical oceanic drifter observations, and that the simple dynamical balancing technique works well for midlatitude ocean circulation.

KW - Data assimilation

KW - Drifter assimilation

KW - Lagrangian data assimilation

KW - Ocean modeling

KW - Ocean prediction

UR - http://www.scopus.com/inward/record.url?scp=0141994470&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0141994470&partnerID=8YFLogxK

M3 - Article

VL - 108

SP - 31

JO - Journal of Geophysical Research: Oceans

JF - Journal of Geophysical Research: Oceans

SN - 2169-9275

IS - 7

ER -