A permanently operating superconducting gravimeter is in operation at Onsala Space Observatory since June 2009. The main purpose of the facility is to be seen in conjunction with projects that determine gravity change in Fennoscandia, e.g. the Nordic Geodetic Commission's Working Group for Geodynamics. A dominating effect of gravity change in the form of a secular trend is for instance related to the post-glacial isostatic adjustment, an after-effect of the latest great ice sheet in the Pleistocene and its disappearance about 10,000 years ago.
The superconducting gravimeter can monitor temporal changes of gravity and thus provide visiting teams operating absolute gravimeters (free-falling prisms) with measurements of perturbations. These perturbations relate most often to the changing ground water masses near the observing point. But also the attraction and loading effects of the - coupled - system atmospere and ocean are fairly complicated at the near-by coast of Kattegat.
For more information: see the web site of the superconducting gravimeter.
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