Weddell Sea - Antarctica
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Authors: J. Schwabe, M. Scheinert
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Created: 2012
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Resp: J. Schwabe
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Description:
There, a refined geoid is of interest, especially for oceanographic
and glaciological applications. For example, to investigate the Weddell
Gyre as a part of the Antarctic Circumpolar Current and, thus, of the
global ocean circulation, the mean dynamic topography (MDT) is needed.
These days, the marine gravity field can be inferred with high and homogeneous
resolution from altimetric height profiles of the mean sea surface. However,
in areas permanently covered by sea ice as well as in coastal regions, satellite
altimetry features deficiencies. Focussing on the Weddell Sea, these aspects are
investigated in detail. In these areas, ground-based data that have not been used
for geoid computation so far provide additional information in comparison with the
existing high-resolution global gravity field models such as EGM2008. The geoid
computation is based on the remove - compute - restore approach making use of least-squares
collocation. The residual geoid with respect to a release 4 GOCE model adds up to two
meters and more in the near-coastal and continental areas of the Weddell Sea region,
also in comparison with EGM2008. Consequently, the thus refined geoid serves to compute
new estimates of the regional MDT and geostrophic currents.The dataset can be also
downloaded from the
PANGAEA website.
References:
J. Schwabe, M. Scheinert (2014). Regional geoid of
the Weddell Sea, Antarctica, from heterogeneous ground-based gravity data.
Journal of Geodesy, 88, pp. 821-838. DOI: 10.1007/s00190-014-0724-x
Web of Science ID:
DRCI:DATA2019017015400568
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