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Tijana Janjic Pfander

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

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Co-Authors

Jens Schröter

University of Bonn

A. Albertella

Politecnico di Milano

W Bosch

Technical University of Munich

Reiner Rummel

Technical University of Munich

R Savcenko

Technical University of Munich

Lars Nerger

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Sergey Danilov

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Svetlana Loza

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Ralph Timmermann

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Olaf Klatt

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Cooperative Institutions

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Technical University of Munich

TU Dresden

Leibniz Institute for Baltic Sea Research

Institute of Oceanology. PP Shirshov Russian Academy of Sciences

University of Bremen

Planet

University of Bonn

Dalhousie University

University of Washington

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Assimilation of geodetic dynamical ocean topography data

Tijana Janjic Pfander Jens Schröter A. Albertell W Bosch Reiner Rummel

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FEOM, status and plans

Jens Schröter Sergey Danilov Dmitry Sidorenko Qiang Wang Ralph Timmermann

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Entwicklung und Implementierung eines Verfahrens zur Datenassimilation von Fernerkundungsdaten in ein operationelles Modell für die Nord- und Ostsee (DOM)

Svetlana Loza Lars Nerger Tijana Janjic Pfander Jens Schröter F. Janssen

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About domain localization in ensemble based Kalman filter algorithms

Tijana Janjic Pfander Lars Nerger Jens Schröter

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Error due to Unresolved Scales in Estimation Problems for Atmospheric Data Assimilation.

Tijana Janjic Pfander

Assimilation (phonology)

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Assimilation of geostrophic velocity and height data into a finite element ocean model

Tijana Janjic Pfander Lars Nerger Jens Schröter Sergey Danilov

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Hybrid SEIK algorithm for oceanographic data assimilation

Tijana Janjic Pfander Sergey Skachko Sergey Danilov Jens Schröter

The singular evolutive interpolated Kalman filter (SEIK) as a variant of the ensemble Kalman filter has been implemented and tested for application in oceanography assimilating altimetric data within twin experiments framework. Previous studies suggest that this filter is reasonably well-behaved in the presence of instability. In the SEIK assimilation algorithm, the analysis error covariance matrix is approximated by a covariance matrix whose rank corresponds to the number of ensemble members used for representing the forecast error covariance. In order to achieve a computationally efficient algorithm, the rank of this covariance matrix is often chosen to be small, leading to problems with the convergence of the filter.

Rank (graph theory)

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A. Albertella Roman Savchenko Tijana Janjic Pfander Reiner Rummel W Bosch

A Mean Dynamic ocean Topography (MDT) has been computed using a high resolution GOCE gravity model and a new mean sea surface obtained based on a multi‐mission analysis of satellite altimetry and covering the period October 1992 till April 2010. The considered gravity model is a pure GOCE gravity model, computed using 12 months of data. The GOCE gravity data allow for more detailed and accurate estimates of MDT. This is illustrated in the Southern Ocean where the calculation of geostrophic velocities from satellite data is now possible with higher accuracy and spatial resolution. In order to assess the properties of the derived geostrophic velocity field, velocities are compared with independent data from satellite tracked surface drifters in the area of the Antarctic Circumpolar Current (ACC).

Geostrophic current

Satellite Altimetry

Ocean surface topography

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On the relation of the SEIK and ETKF filter methods

Lars Nerger Tijana Janjic Pfander Jens Schröter Wolfgang Hiller

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Mass and heat transport estimates by assimilation of geodetic dynamical ocean topography data

Tijana Janjic Pfander Jens Schröter A. Albertella R Savcenko W Bosch

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