Using a Superconducting Gravimeter in Support of Absolute Gravity Campaigning — A feasibility study

This is a Preprint and has not been peer reviewed.

Downloads

Download Preprint

Authors

Hans-Georg Scherneck , Marcin Rajner 

Abstract

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 site-dependent 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 $\dot{g}$ in the drift model at the 0.5~nm/s$^2$/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.

DOI

https://doi.org/10.31223/osf.io/yxvjc

Subjects

Earth Sciences, Engineering, Life Sciences, Other Earth Sciences, Physical Sciences and Mathematics

Keywords

absolute gravimeter, Glacial Isostatic Rebound, gravimetry, superconducting gravimeter

Dates

Published: 2019-05-13 13:01

Last Updated: 2019-06-07 16:13

Older Versions
License

GNU Lesser General Public License (LGPL) 2.1

Add a Comment

You must log in to post a comment.


Comments

There are no comments or no comments have been made public for this article.