Antarctic iceberg distribution and dissolution from ship-based observations
The Australian Antarctic Program’s iceberg dataset (from ship-based observations), including information from the austral summer seasons 1984/85 to 1999/2000, is examined and used to extend earlier studies. Using ‘snapshots’ of the iceberg population to provide an idea of the iceberg life cycle, the...
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International Glaciological Society
2007
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Online Access: | https://eprints.utas.edu.au/4011/ https://eprints.utas.edu.au/4011/1/4011.pdf https://doi.org/10.3189/002214307783258521 |
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ftunivtasmania:oai:eprints.utas.edu.au:4011 2023-05-15T13:36:46+02:00 Antarctic iceberg distribution and dissolution from ship-based observations Jacka, TH Giles, AB 2007 application/pdf https://eprints.utas.edu.au/4011/ https://eprints.utas.edu.au/4011/1/4011.pdf https://doi.org/10.3189/002214307783258521 en eng International Glaciological Society https://eprints.utas.edu.au/4011/1/4011.pdf Jacka, TH and Giles, AB 2007 , 'Antarctic iceberg distribution and dissolution from ship-based observations' , Journal of Glaciology, vol. 53, no. 182 , pp. 341-356 , doi:10.3189/002214307783258521 <http://dx.doi.org/10.3189/002214307783258521>. cc_utas 260115 Glaciology Article PeerReviewed 2007 ftunivtasmania https://doi.org/10.3189/002214307783258521 2020-05-30T07:17:53Z The Australian Antarctic Program’s iceberg dataset (from ship-based observations), including information from the austral summer seasons 1984/85 to 1999/2000, is examined and used to extend earlier studies. Using ‘snapshots’ of the iceberg population to provide an idea of the iceberg life cycle, the distribution of icebergs between 60 and 1508 E is discussed in terms of calving regions and ocean currents. Temporal changes are also examined. The discussion leads us to the point where we can define an area, bounded to the north by the maximum sea-ice limit and to the south by the Antarctic Divergence, in which icebergs are confined as they drift eastward. This allows estimation of total dissolution, in terms of iceberg numbers and volume, within 108 longitudinal sectors and, with knowledge of drift speeds, iceberg movement rates and freshwater input across the sector. Iceberg dissolution rates are found to be 0.03–0.05md–1 and the total mass contribution of fresh water to the ocean as the icebergs traverse our 308 of longitude study sector is 32 Gt. This amounts to a contribution equivalent to precipitation of 15.5cm a–1, accounting for 2% of the total iceberg discharge from the Antarctic ice sheet. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Iceberg* Journal of Glaciology Sea ice University of Tasmania: UTas ePrints Antarctic Austral The Antarctic Journal of Glaciology 53 182 341 356 |
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Open Polar |
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University of Tasmania: UTas ePrints |
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ftunivtasmania |
language |
English |
topic |
260115 Glaciology |
spellingShingle |
260115 Glaciology Jacka, TH Giles, AB Antarctic iceberg distribution and dissolution from ship-based observations |
topic_facet |
260115 Glaciology |
description |
The Australian Antarctic Program’s iceberg dataset (from ship-based observations), including information from the austral summer seasons 1984/85 to 1999/2000, is examined and used to extend earlier studies. Using ‘snapshots’ of the iceberg population to provide an idea of the iceberg life cycle, the distribution of icebergs between 60 and 1508 E is discussed in terms of calving regions and ocean currents. Temporal changes are also examined. The discussion leads us to the point where we can define an area, bounded to the north by the maximum sea-ice limit and to the south by the Antarctic Divergence, in which icebergs are confined as they drift eastward. This allows estimation of total dissolution, in terms of iceberg numbers and volume, within 108 longitudinal sectors and, with knowledge of drift speeds, iceberg movement rates and freshwater input across the sector. Iceberg dissolution rates are found to be 0.03–0.05md–1 and the total mass contribution of fresh water to the ocean as the icebergs traverse our 308 of longitude study sector is 32 Gt. This amounts to a contribution equivalent to precipitation of 15.5cm a–1, accounting for 2% of the total iceberg discharge from the Antarctic ice sheet. |
format |
Article in Journal/Newspaper |
author |
Jacka, TH Giles, AB |
author_facet |
Jacka, TH Giles, AB |
author_sort |
Jacka, TH |
title |
Antarctic iceberg distribution and dissolution from ship-based observations |
title_short |
Antarctic iceberg distribution and dissolution from ship-based observations |
title_full |
Antarctic iceberg distribution and dissolution from ship-based observations |
title_fullStr |
Antarctic iceberg distribution and dissolution from ship-based observations |
title_full_unstemmed |
Antarctic iceberg distribution and dissolution from ship-based observations |
title_sort |
antarctic iceberg distribution and dissolution from ship-based observations |
publisher |
International Glaciological Society |
publishDate |
2007 |
url |
https://eprints.utas.edu.au/4011/ https://eprints.utas.edu.au/4011/1/4011.pdf https://doi.org/10.3189/002214307783258521 |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Iceberg* Journal of Glaciology Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet Iceberg* Journal of Glaciology Sea ice |
op_relation |
https://eprints.utas.edu.au/4011/1/4011.pdf Jacka, TH and Giles, AB 2007 , 'Antarctic iceberg distribution and dissolution from ship-based observations' , Journal of Glaciology, vol. 53, no. 182 , pp. 341-356 , doi:10.3189/002214307783258521 <http://dx.doi.org/10.3189/002214307783258521>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.3189/002214307783258521 |
container_title |
Journal of Glaciology |
container_volume |
53 |
container_issue |
182 |
container_start_page |
341 |
op_container_end_page |
356 |
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1766083732731592704 |