Using a Superconducting Gravimeter in Support of Absolute Gravity Campaigning — A Feasibility Study
Journal article, 2019

Preparing for joint analysis of absolute gravity (AG) campaigns, this report investigates whether a
stationary superconducting gravimeter (SCG) can provide a long-term stable measurement of sitedependent
perturbations that help in reduction to the local value of little-g and its secular rate of change.
The crucial element concerns the discrimination of instrumental drift components from trends of physical
origin, where biasses in the inferred long-term drift rate may offset the rate that the reduced AG campaigns
deliver. Thus, the main objective is to include a set of gravity models and proxy series as complete
as possible in the SCG analysis. Findings indicate consistency for dg/dt in the drift model at the 0.5 nm/s2/yr
level using observations at Onsala Space Observatory from 2009 to 2017. In pursuit of the overriding
objective to improve the accuracy of secular rates of gravity owed to Glacial Isostatic Adjustment, our
approach may even put numbers on a range of long-term changes due to atmosphere, hydrology, and
non-tidal ocean loading, namely the rate biasses reported here.

Glacial Isostatic Rebound

absolute gravimeter

Gravity change

Superconducting Gravimeter

Author

Hans-Georg Scherneck

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Space Geodesy and Geodynamics

Marcin Rajner

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Space Geodesy and Geodynamics

Geophysica

0367-4231 (ISSN) 2324-0741 (eISSN)

Vol. 54 1 117-135

Roots

Basic sciences

Infrastructure

Onsala Space Observatory

Subject Categories

Earth and Related Environmental Sciences

Geophysics

More information

Created

11/27/2019