A comparison of sea-ice thickness measurements made using ship-mounted and airborne electromagnetic induction devicesEntry ID: ASAC_1342
Abstract: Metadata record for data from ASAC Project 1342
See the link below for public details on this project.
---- Public Summary from Project ----
This project involves field trialling of software written as part of ASAC project 1212 (2000-2001) to determine sea-ice thickness in real-time from ship-borne electromagnetic induction measurements. Computer simulation of ship- and helicopter-borne ... electromagnetic induction measurements over realistic sea-ice structures will also be performed in order to assess the suitability and cost-effectiveness of helicopter-mounted systems for future Antarctic sea-ice thickness measurements.
Equipment used in this study were the IBEO PS100 infrared laser altimeter and the Geonics EM31 geophysical electromagnetic induction device.
The fields in this dataset are:
DAY is Julian day
TIME is in seconds after midnight (UTC).
LASER is the laser altitude above the snow/ice (metres). A zero reading
indicates no return (open water).
PITCH is pitch of the system in degrees.
ROLL is roll of the system in degrees.
COND-A is analogue conductivity from the EM31 (not used).
PHASE-A is analogue in-phase response from the EM31 (not used).
COND is the estimated depth to seawater (metres) from the EM31-ICE processing module.
PHASE is the EM31 in-phase response (expressed as parts per thousand of the primary field). A value of 9.99 indicates the magnetic field was too large to be recorded.
a is the electrode spacing.
R is the measured resistance.
Rho is the apparent conductivity (not true conductivity) = 2 aR.
CONDUCTIVITY = 1/Rho.
Start Date: 2001-09-30Stop Date: 2002-03-31
ISO Topic Category
Quality The PS100 laser altimeter used for these measurements was found to operate incorrectly in conditions of bright sunlight. Raw laser altimeter data contains numerous spurious values. An edited dataset is currently being created.
Average sea ice floe size was encountered during the voyage was ~20-40 m. Patches of open water between floes adversely affect EM ice thickness measurements. Some sea ice was too thick to be measured by the EM instrument. An edited dataset containing acceptable sea ice thickness values is currently being created. Values provided in temporal coverage are approximate only.
Access Constraints The dataset is available for download from the url given below.
Use Constraints This data set conforms to the PICCCBY Attribution License
Data Set Progress
Distribution Media: HTTP
Distribution Size: 41232 kb
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6226 2477
Fax: +61 3 6223 2547
Email: James.Reid at utas.edu.au
School of Earth Sciences GPO Box 252-79 University of Tasmania
Province or State: Tasmania
Postal Code: 7001
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2001-04-09
Last DIF Revision Date: 2014-08-28