G. Kivman
Alfred Wegener Institute for Polar and Marine Research
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Featured researches published by G. Kivman.
Ocean Modelling | 2004
Sergey Danilov; G. Kivman; Jens Schröter
Abstract We describe a three-dimensional (3D) finite-element ocean model designed for investigating the large-scale ocean circulation on time scales from years to decades. The model solves the primitive equations in the dynamical part and the advection–diffusion equations for temperature and salinity in the thermodynamical part. The time-stepping is implicit. The 3D mesh is composed of tetrahedra and has a variable resolution. It is based on an unstructured 2D surface mesh and is stratified in the vertical direction. The model uses linear functions for horizontal velocity and tracers on tetrahedra, and for surface elevation on surface triangles. The vertical velocity field is elementwise constant. An important ingredient of the model is the Galerkin least-squares stabilization used to minimize effects of unresolved boundary layers and make the matrices to be inverted in time-stepping better conditioned. The model performance was tested in a 16-year simulation of the North Atlantic using a mesh covering the area between 7° and 80° N and providing variable horizontal resolution from 0.3° to 1.5°.
EPIC32nd CHAMP Science Meeting, GeoForschungsZentrum Potsdam, Sept.1-4.,. | 2005
G. Kivman; Sergey Danilov; Bernadette Fritzsch; Sven Harig; Christian Reick; Jens Schröter; V. Seufer; Dmitry Sidorenko; Joanna Staneva; Manfred Wenzel
Ocean general circulation models which are constrained by altimetry data usually assimilate only temporal sea-surface height anomalies. It is known that this is not enough to correct the mean ocean state. Here we present first results of assimilating the full (absolute) dynamical topography into a steady state version of a finite element ocean model (FEOM) for the North Atlantic. This makes it possible to notably reduce the model-data misfit especially in the western part of the basin and in the southern Labrador Sea.
Journal of Marine Systems | 2003
Svetlana N. Losa; G. Kivman; Jens Schröter; Manfred Wenzel
Ocean Modelling | 2005
Sergey Danilov; G. Kivman; Jens Schröter
Geophysical Research Letters | 2006
Dmitry Sidorenko; Sergey Danilov; G. Kivman; Jens Schröter
EPIC3Reigber, C., Lühr, H., Schwintzer, P. and Wickert, J.(Eds): Earth Observsation with CHAMP, Results from Three Years in Orbit, Springer Berlin Heidelberg New York, pp. 211-216 , ISBN: 3-540-22804-7 | 2005
G. Kivman; Sergey Danilov; Bernadette Fritzsch; Sven Harig; Christian Reick; Jens Schröter; V. Seufer; Dmitry Sidorenko; J. Staneva; Manfred Wenzel
EPIC3Workshop on Data Assimilation applications in large scale models, Delft (the Netherlands), November, pp. 7-8 | 2006
Svetlana Loza; G. Kivman; Jens Schröter; Manfred Wenzel
The EGU General Assembly | 2005
Sergey Danilov; G. Kivman; Jens Schröter
EPIC3European Geosciences Union General Assembly, ViennaApril 2005., 24 | 2005
Svetlana Loza; G. Kivman; Jens Schröter; Manfred Wenzel
EPIC3European Geosciences Union General Assembly, Vienna, 24-29 April 2005. | 2005
Svetlana Loza; G. Kivman; Jens Schröter; Markus Schartau