Results of three year observation with a superconducting gravimeter at the GeoForschungsZentrum Potsdam |
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| Authors: | J Neumeyer H-J Dittfeld |
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| Institution: | (1) GeoForschungsZentrum Potsdam (GFZ) Div. 1'Kinematics and Dynamics of the Earth', Telegrafenberg A17, D-14473 Potsdam, Germany, DE |
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| Abstract: | The superconducting gravimeter (SG) TT70 has been continuously recording gravity data at the GeoForschungsZentrum (GFZ) Potsdam
absolute gravity site since July 1992. The recorded data are edited and preprocessed by spike and step detection and elimination
and gap filling. An atmospheric pressure correction is carried out on gravity data in the time domain with a complex admittance
before tidal fitting. The atmospheric pressure admittance is calculated from tide free output of SG data and local atmospheric
pressure using the cross spectral method. The ground water level admittance is determined by a single coefficient. Improvements
with these corrections are shown in analysis results.
New tidal parameters for Potsdam site are determined and compared with recordings of an Askania spring gravimeter at a nearby
site. Deviations against the Wahr-Dehant-model are shown.
Polar motion data of the IERS (International Earth Rotation Service, Paris) are used to calculate variations of centrifugal
acceleration caused by polar motion (pole tide). These are compared with the corrected tide free output of SG series. For
drift determination the polar motion correction is applied on SG data.
The nutation period equivalent to the Earth's Nearly Diurnal Free Wobble is calculated from the SG data with a value of TFCN = (437.4 ± 1.5) sidereal days. This result is compared with those obtained from other SG stations.
Received 19 December 1995; Accepted 13 September 1996 |
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