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European Geophysical Society (EGS), XXIII General Assemblies,
Nice, France, 20-24 April 1998,
Annales Geophysicae. Supplement Vol. 16.
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The Diagnostic Analysis of Baroclinic
Ocean Dynamics by Satellite Altimetry Data
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Russian
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The diagnostic analysis of ocean dynamics by satellite altimetry
data may give complete hydrodynamical picture on that time moment, when
appropriate measurements were made. The first valuation of baroclinic ocean
dynamic structure can become definition barotropic (average on depth) mode
of speed field, designed through integrated stream function on the basis
of satellite information.
As an initial system of offered model equations are considered
equations of ocean dynamics in quasigeostophic approximation. The boundary
condition on surface for vertical mode of speed fields is replaced by "firm
cover" condition, and a condition of sliding without friction is at the
bottom taken.
For processing of satellite altimetry data, when the density
field on whole ocean height is not known, is offered to search integrated
stream function as anomalies from mean (mean season) significance. By virtue
of it is possible to make the assumption that the changes of baroclinic
layer thickness (in which are concentrated main density changes, and the
which thickness is small in comparison with depth of ocean) are insignificant.
In the first approach it is possible to consider, that the density anomaly
concerning mean significance on a linearly change by vertical from surface
significance to zero on the baroclinic layer bottom border. The account
of dynamic topography on satellite altimetry data is carried conducted
on mean sea surface field and geoid height.
The model verification was conducted on independent data:
satellite altimetry (ERM mission GEOSAT) and hydrological data (experiment
NEWFAEXP-88 the program "Sections") for polygon Newfoundland Ocean Energy
Active Zone in march 1988. In the first numerical experiment of dynamic
topography anomaly was designed by hydrological data and simulated by self
of satellite altimetry processing results. In the second initial information
was considered directly by remote data from GEOSAT board. The mean fields
of dynamic topography and integrated stream function were determined by
known data file LEVITUS.
The results analysis has shown, that integrated stream function
fields and barotropic speed mode, received in result of imitation experiment,
will be well agreed results of diagnostic accounts by density field. Thus,
the offered model may with sufficient accuracy to define barotropic speed
mode of baroclinic ocean by satellite altimetry data.
© Geophysical Center RAS, 1998 |