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...
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ftunivtasecite:oai:ecite.utas.edu.au:50245 2023-05-15T13:40:51+02:00 Antarctic iceberg distribution and dissolution from ship-based observations Jacka, TH Giles, AB 2007 https://doi.org/10.3189/002214307783258521 http://ecite.utas.edu.au/50245 en eng International Glaciological Society http://dx.doi.org/10.3189/002214307783258521 Jacka, TH and Giles, AB, Antarctic iceberg distribution and dissolution from ship-based observations, Journal of Glaciology, 53, (182) pp. 341-356. ISSN 0022-1430 (2007) [Refereed Article] http://ecite.utas.edu.au/50245 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2007 ftunivtasecite https://doi.org/10.3189/002214307783258521 2019-12-13T21:24:38Z 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 150 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 10 longitudinal sectors and, with knowledge of drift speeds, iceberg movement rates and freshwater input across the sector. Iceberg dissolution rates are found to be 0.03-0.05 m d-1 and the total mass contribution of fresh water to the ocean as the icebergs traverse our 30 of longitude study sector is 32 Gt. This amounts to a contribution equivalent to precipitation of 15.5cma-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 eCite UTAS (University of Tasmania) Antarctic The Antarctic Austral Journal of Glaciology 53 182 341 356 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
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Earth Sciences Physical Geography and Environmental Geoscience Glaciology Jacka, TH Giles, AB Antarctic iceberg distribution and dissolution from ship-based observations |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience 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 150 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 10 longitudinal sectors and, with knowledge of drift speeds, iceberg movement rates and freshwater input across the sector. Iceberg dissolution rates are found to be 0.03-0.05 m d-1 and the total mass contribution of fresh water to the ocean as the icebergs traverse our 30 of longitude study sector is 32 Gt. This amounts to a contribution equivalent to precipitation of 15.5cma-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://doi.org/10.3189/002214307783258521 http://ecite.utas.edu.au/50245 |
geographic |
Antarctic The Antarctic Austral |
geographic_facet |
Antarctic The Antarctic Austral |
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 |
http://dx.doi.org/10.3189/002214307783258521 Jacka, TH and Giles, AB, Antarctic iceberg distribution and dissolution from ship-based observations, Journal of Glaciology, 53, (182) pp. 341-356. ISSN 0022-1430 (2007) [Refereed Article] http://ecite.utas.edu.au/50245 |
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 |
_version_ |
1766141441784938496 |