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4. ASAC_275

Description

Metadata record for data from ASAC Project 275 See the link below for public details on this project.

From the abstracts of the referenced papers:

The East Antarctica ice sheet advanced onto the continental shelf during the last glaciation but appears to have been thinner (less than 300 m) than previously hypothesised and probably did not everywhere extend to the edge of the continental shelf. Where the shelf is wide, the ice probably terminated against shallow banks on its outer edge. There may not have been time for the sheet to develop the maximum profile form and thickness predicted by Hollin (1962) and Hughes and others (1981) of about 1000-500 m over the shelf. Large outlet glaciers occupied deep troughs that conveyed most of the ice towards the edge of the shelf: intervening areas were less intensely glaciated. Much of the Prince Charles Mountains and Amery Oasis were not ice-covered: Vestfold, Bunger and Casey oases were glaciated. Vestfold and Bunger oases became ice-free after 10 ka BP under the influence of the Holocene marine transgression, which was complete by about 6 ka BP. During at least the last 5-6 ka these oases have been approximately their present size. Since then the margins of the Antarctic continental ice sheet have maintained almost steady state conditions against the landward edges of the hill masses.

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Observational studies on Cainozoic environmental changes in both Tasmania and East Antarctica have led to important modifications in the accepted interpretation of the history of glaciation for each area. Many contributors have played an important role in the processes of investigation leading to the present state of knowledge. A crucial role has been played by the integration of the methods. From studies based on combinations of these approaches, a model of multiple glaciations has been developed to explain observed features in Tasmania. This model is complemented by studies of vegetation history, largely through pollen analysis. A less complete picture of the history of ice-sheet fluctuations in East Antarctica is beginning to emerge from similar applications of cross-disciplinary studies.

Quality

Values provided in temporal and spatial coverage are approximate only.

Access

PDF copies of the referenced papers are available for download from the provided URL to AAD staff only.

Temporal Coverages

• Start date: 1987-09-30 - Stop date: 1995-03-31

Spatial Coverages

Science Keywords

• EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIERS
• EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
• EARTH SCIENCE > PALEOCLIMATE > LAND RECORDS > GLACIATION
• EARTH SCIENCE > PALEOCLIMATE > LAND RECORDS > MACROFOSSILS
• EARTH SCIENCE > PALEOCLIMATE > LAND RECORDS > MICROFOSSILS
• EARTH SCIENCE > PALEOCLIMATE > PALEOCLIMATE RECONSTRUCTIONS

Use Constraints

This data set conforms to the CCBY Attribution License
(http://creativecommons.org/licenses/by/4.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_275 when using these data.