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Regional geoid model for the area of the subglacial Lake Vostok (2014)

Schwabe, Joachim ; Ewert, Heiko ; Scheinert, Mirko ; [et al.]

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In: Supplement to: Schwabe, Joachim; Ewert, Heiko; Scheinert, Mirko; Dietrich, Reinhard (2014): Regional geoid modeling in the area of subglacial Lake Vostok, Antarctica. Journal of Geodynamics, 75, 9-21, https://doi.org/10.1016/j.jog.2013.12.002

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Publication Date: 2023-07-22

Description: We present a regional geoid model for the area of Lake Vostok, Antarctica, from a combination of local airborne gravity, ice-surface and ice-thickness data and a lake bathymetry model. The topography data are used for residual terrain modelling (RTM) in a remove-compute-restore approach together with the GOCE satellite model GOCO03S. The disturbing potential at the Earth's surface, i.e. the quasigeoid, is predicted by least-squares collocation (LSC) and subsequently converted to geoid heights. Compared to GOCO03S our regional solution provides an additional short-wavelength signal of up to 1.48 m, or 0.56 m standard deviation, respectively. More details can be found in Schwabe et. al (2014).

Keywords: Lake_Vostok_geoid; Model; Vostok, Antarctica

Type: Dataset

Format: text/plain, 4.9 MBytes

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Improved geoid solution for the Weddell Sea region (2014)

Schwabe, Joachim ; Scheinert, Mirko

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In: Supplement to: Schwabe, Joachim; Scheinert, Mirko (2014): Regional geoid of the Weddell Sea, Antarctica, from heterogeneous ground-based gravity data. Journal of Geodesy, 88(9), 821-838, https://doi.org/10.1007/s00190-014-0724-x

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Publication Date: 2023-07-22

Description: We present a geoid solution for the Weddell Sea and adjacent continental Antarctic regions. 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.

Keywords: Weddell_Sea_Region; Weddell Sea

Type: Dataset

Format: text/plain, 14.9 MBytes

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Antarctic free-air and complete Bouguer gravity anomaly grid (2016)

Scheinert, Mirko ; Ferraccioli, Fausto ; Schwabe, Joachim ; [et al.]

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In: Supplement to: Scheinert, Mirko; Ferraccioli, Fausto; Schwabe, Joachim; Bell, Robin E; Studinger, Michael; Damaske, Detlef; Jokat, Wilfried; Aleshkova, Nadezhda D; Jordan, Tom A; Leitchenkov, German L; Blankenship, Donald D; Damiani, Theresa; Young, Duncan A; Cochran, James R; Richter, Thomas (2016): New Antarctic gravity anomaly grid for enhanced geodetic and geophysical studies in Antarctica. Geophysical Research Letters, 43(2), 600-610, https://doi.org/10.1002/2015GL067439

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Publication Date: 2023-08-24

Description: Gravity surveying is challenging in Antarctica because of its hostile environment and inaccessibility. Nevertheless, many ground-based, airborne, and shipborne gravity campaigns have been completed by the geophysical and geodetic communities since the 1980s. We present the first modern Antarctic-wide gravity data compilation derived from 13 million data points covering an area of 10 million km**2, which corresponds to 73% coverage of the continent. The remove-compute-restore technique was applied for gridding, which facilitated leveling of the different gravity data sets with respect to an Earth gravity model derived from satellite data alone. The resulting free-air and Bouguer gravity anomaly grids of 10 km resolution are publicly available. These grids will enable new high-resolution combined Earth gravity models to be derived and represent a major step forward toward solving the geodetic polar data gap problem. They provide a new tool to investigate continental-scale lithospheric structure and geological evolution of Antarctica.

Keywords: Accuracy; Bouguer anomaly; Free-air gravity anomaly; Height above ellipsoid; LATITUDE; LONGITUDE; Orthometric height; pan-Antarctica; x; y

Type: Dataset

Format: text/tab-separated-values, 2224256 data points

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Assimilation of dynamic topography in a global model (2013)

Nerger, Lars ; Albertella, Alberta ; Bosch, Wolfgang ; [et al.]

In: EPIC3EGU General Assembly, April 8 - 12, 2013, Vienna, Austria (Geophysical Research Abstracts, Vol. 15, EGU2013-10271)

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Publication Date: 2019-07-16

Description: Absolute dynamic topography, i.e. the difference between time dependent multi-mission altimetric sea surface height and one of the most recent GOCE and GRACE based geoids, is assimilated in a global ocean general circulation model. To this end we apply an ensemble based Kalman technique, the "Error Subspace Transform Kalman Filter" (ESTKF). Here we present an update of our work. First of all the geoid is improved over previous versions. The ocean model now includes better dynamics and full sea-ice ocean interactions and more realistic surface forcing. Finally the assimilation method is augmented by a fixed lag smoother technique. This smoother allows to significantly improve the model performance, most strikingly in the first adjustment phase.

Repository Name: EPIC Alfred Wegener Institut

Type: Conference , notRev

Format: application/pdf

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