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Non-tidal ocean loading signals of the North and Baltic Sea from terrestrial gravimetry, GNSS, and high-resolution modeling
  • +9
  • Christian Voigt,
  • Roman Sulzbach,
  • Henryk Dobslaw,
  • Adelheid Weise,
  • Ludger Timmen,
  • Zhiguo Deng,
  • Marvin Reich,
  • Nico Stolarczuk,
  • Heino Peters,
  • Michael Fietz,
  • Maik Thomas,
  • Frank Michael Flechtner
Christian Voigt
Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Corresponding Author:[email protected]

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Roman Sulzbach
GFZ German Research Centre for Geosciences
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Henryk Dobslaw
GeoForschungsZentrum Potsdam
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Adelheid Weise
Leibniz Universität Hannover
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Ludger Timmen
Universität Hannover
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Zhiguo Deng
Helmholtz Center Potsdam, German Research Center for Geosciences (GFZ)
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Marvin Reich
GFZ German Research Centre for Geosciences
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Nico Stolarczuk
Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
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Heino Peters
Alfred-Wegener-Institute (AWI), Helmholtz Centre for Polar and Marine Research
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Michael Fietz
Alfred-Wegener-Institute (AWI), Helmholtz Centre for Polar and Marine Research
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Maik Thomas
Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences
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Frank Michael Flechtner
GFZ Potsdam
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Abstract

Non-tidal ocean loading signals are known to be a significant source of geophysically induced noise in gravimetric and geodetic observations also far-away from the coast and especially during extreme events such as storm surges. Operational products suffer from a low temporal and spatial resolution and reveal only small amplitudes on continental stations. Dedicated high-resolution sea-level modelling of the North and Baltic Sea provides a largely improved prediction of non-tidal ocean loading signals. Superconducting gravimeter and GNSS observations on the small offshore island of Heligoland in the North Sea are used for a thorough evaluation of the model values revealing correlations of up to 0.9 and signal reductions of up to 50 % during a storm surge period of one month in Jan-Feb 2022. Additional continental superconducting gravimeter stations are used to assess the benefits from high-resolution modelling for an improved signal separation further away from the coast.
19 Mar 2024Submitted to ESS Open Archive
25 Mar 2024Published in ESS Open Archive