Ice thickness, mass balance and dynamics of the ice sheet east of Davis, and of the Lambert GlacierEntry ID: ASAC_2085
Abstract: Metadata record for data from ASAC Project 2085
See the link below for public details on this project.
---- Public Summary from Project ----
Over the past 20 years, Australian glaciologists have measured the ice thickness, snow accumulation rate and ice surface movement rate around the Antarctic continent, approximately following the 2,000 m elevation contour. They have completed this survey for ... the entire Australian Antarctic sector, except for one section between Davis and the Russian station, Mirny. This project will carry out the measurements in this last section.
It will also carry out detailed measurements of ice thickness and ice movement rate on the Lambert Glacier and some of its tributaries. This glacier is the largest in the world and it drains about one eighth of the Antarctic ice mass into the sea.
From these measurements, calculations of the mass flux (i.e. the amount of ice flowing through the section) are made. Changes over time in the mass flux indicate whether the ice sheet is getting larger or smaller, and this in turn is related to climate and sea level change.
This project aims to determine the ice thickness, surface ice velocity and mass discharge of the region between Mirny and the Larsemann Hills. This is the remaining gap in the otherwise comprehensive ANARE measurements of mass discharge across the 2000 m elevation contour between 40E and 130E. Observations were conducted over three summer field seasons from Jan. 1998 to Jan. 2000, with the use two Sikorsky S76 long range helicopters based at Davis. Ice thickness was obtained with the ANARE 100 MHz ice radar mounted in one of the helicopters. The transmitter and receiver configurations are essentially the same as that used on the Lambert Glacier tractor traverse (see Higham et al.,1995). To accommodate speeds of up to 180 km/hr in airborne operations the slower digital oscilloscope system has been replaced by a high speed digital signal processor and a high speed analogue to digital converter. The airborne antenna used by the helicopter is smaller than that used by tractor traverses and the signal processing power of the DSP has been improved to compensate for reduced antenna gain. Ice velocity and surface elevation were measured at selected locations with dual frequency GPS instruments. Accumulation and gravity observations were also made at these sites. An automatic weather station (AWS) was installed at one of the survey sites 50 km south of Mt Brown. In addition to filling a major gap in the synoptic network, the AWS will be used to assist in the interpretation of a shallow snow core.
Data Set Citation
Dataset Originator/Creator: Jacka, J.
Dataset Title: Ice thickness, mass balance and dynamics of the ice sheet east of Davis, and of the Lambert Glacier
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2012-05-30
Dataset Publisher: Australian Antarctic Data Centre
Dataset DOI: doi:10.4225/15/55EE2BDAB071FOnline Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...
Start Date: 1997-09-30Stop Date: 2001-03-31
Quality Values provided in temporal and spatial coverage are approximate only.
See the reports for further information.
Some notes about accessing the data:
In the "Rad Program - radar" folder there is an exe file that allows you to read the radar files.
The "Raw" folders contain the radar data that you need the above exe for.
The GPS data came from a Leica device - and you may need software from Leica to read it. The appropriate program was called SKI. Tasmanian University surveying group may still have access to it - Rachel Manson or Chris Watson. However, the outputs from the GPS data are held in the velocity files anyway.
Access Constraints These data are publicly available for download from the provided URL. A copy of the two main reports relating to the work are also available for download from the provided URL.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2085 when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 1.3 GB
Distribution Format: Binary, Text
Distribution Media: HTTP
Distribution Size: 26.3 MB
Distribution Format: PDF
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3365
Fax: +61 3 6226 2902
Email: jo.jacka at utas.edu.au
ACE CRC AND AUSTRALIAN ANTARCTIC DIVISION GPO BOX 252-80
Province or State: Tasmania
Postal Code: 7001
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2000-08-11
Last DIF Revision Date: 2017-08-23