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Attention:

Please note that the Marine Gravitymeter System can only be operated upon request. Request operations with the Marine Gravitymeter System to AWI-Logistics in sufficient time prior to the cruise.

Summary

A gravimeter is used to measure the gravitational field of the earth. The gravimeter on board of Polarstern is situated on a gyro-stabilized platform to compensate for the ships movement. It is a spring and mass system with magnetic compensation, the length of the spring being proportional to the gravitation.

Manufacturer Bodensee Gravitymeter Geosystem GmbH (BGGS)
Model KSS 32 M
Serial No. n/a
Type gravimeter

Contacts

Name Institution Role
Graeme Eagles Alfred-Wegener Institute of Polar and Marine Research Principal Investigator
Graeme Eagles Alfred-Wegener Institute of Polar and Marine Research Data Scientist
Thorsten Eggers Alfred-Wegener-Institute for Polar and Marine Research Engineer In Charge

Components

The Marine Gravitymeter System consits of the Gravitymeter KSS 32-M and the operator-laptop in the Gravitymeter Room on board. The Gravitymeter control system and data acquisition software BGGS DACQS is installed on the laptop.

Position

Origin Description:xyz-position from Alignment Survey Report RV Polarstern (June 2016), located in F632
X:56.99 m
(X-0 is at the center of der rudder (ref. design drawing of the vessel), positive X-axis is forward and along vessel centerline)
Y:0.147 m
(Y-0 at centerline, positive Y-axis is portside)
Z:11.81 m
(Z-0 is set to the lowest point of the keel, positive Z-axis is upwards)

Data logging, storage and archiving

Logged parameters

Parameter Sensor Output Type Unit
acceleration acceleration m/s^2
gravity gravity mGal

Central geographical ship's position and time standard

Time stamp from DShip NMEA telegram.
A gyro-stabilized platform accounts for compensation of the ship's movements. Navigation data from DShip NMEA telegram.

Rawdata storage on board

Data storage in DShip system. Rawdata backup to operator-laptop is possible.

Dship

Uncorrected measurement data.

Device name

gravimeter

Parameters

GRAVIMETER.PBGGGD.1.datafield3; GRAVIMETER.PBGGGD.1.datafield4; GRAVIMETER.PBGGGD.2.datafield1; GRAVIMETER.PBGGGD.2.datafield2; GRAVIMETER.PBGGGD.2.datafield3; GRAVIMETER.PBGGGD.2.datafield4

Data archiving on land

After the cruise the DShip data set can be extracted from https://dms.awi.de.

File format(s)

stored in DShip system

Calibration certificates

stored in Gravitimeter Room F632

Documentation

The manuals are located in the Gravitymeter Room on board.



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