Antarctic Iceberg Distribution and Dissolution
Abstract Shipboard observations (in accordance with Norsk Polar-Institutt guidelines) from 6 years of Australian National Antarctic Research Expeditions (ANARE) voyages have provided data giving a detailed knowledge of iceberg sizes and concentrations in the Southern Ocean between long. 60° and 140°...
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Cambridge University Press (CUP)
1986
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Online Access: | http://dx.doi.org/10.1017/s0022143000015574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015574 |
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crcambridgeupr:10.1017/s0022143000015574 2024-03-03T08:38:40+00:00 Antarctic Iceberg Distribution and Dissolution Hamley, T. C. Budd, W. F. 1986 http://dx.doi.org/10.1017/s0022143000015574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015574 en eng Cambridge University Press (CUP) Journal of Glaciology volume 32, issue 111, page 242-251 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1986 crcambridgeupr https://doi.org/10.1017/s0022143000015574 2024-02-08T08:40:23Z Abstract Shipboard observations (in accordance with Norsk Polar-Institutt guidelines) from 6 years of Australian National Antarctic Research Expeditions (ANARE) voyages have provided data giving a detailed knowledge of iceberg sizes and concentrations in the Southern Ocean between long. 60° and 140° E. The resulting size–frequency distributions are examined in conjunction with a knowledge of water movement along known drift tracks in a selected study area (between lat. 59° and 64° S., and long. 90° and 120° E.) to determine iceberg-dissolution rates. The “median life” (before breaking) of icebergs less than 1000 m in horizontal dimension is estimated to be 0.2 a, which is significantly lower than was previously thought. The mean melt rate is estimated to be 0.12 m d –1 , which agrees broadly with previous laboratory studies. The relative contributions of melt, calving, and breakage, plus the enhancement effect of roll-over, are examined in estimating the natural dissolution rate. Breakage appears to be the dominant mechanism for larger icebergs with melt and calving able to explain the disappearance of icebergs in the smallest categories only (within the mean “median-life” period). Examination of the historical records of Captain Cook indicates that iceberg concentrations, as well as the northerly extent in this region 200 years ago, were compatible with the present data. Article in Journal/Newspaper Antarc* Antarctic Iceberg* Journal of Glaciology Southern Ocean Cambridge University Press Antarctic Southern Ocean Journal of Glaciology 32 111 242 251 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Hamley, T. C. Budd, W. F. Antarctic Iceberg Distribution and Dissolution |
topic_facet |
Earth-Surface Processes |
description |
Abstract Shipboard observations (in accordance with Norsk Polar-Institutt guidelines) from 6 years of Australian National Antarctic Research Expeditions (ANARE) voyages have provided data giving a detailed knowledge of iceberg sizes and concentrations in the Southern Ocean between long. 60° and 140° E. The resulting size–frequency distributions are examined in conjunction with a knowledge of water movement along known drift tracks in a selected study area (between lat. 59° and 64° S., and long. 90° and 120° E.) to determine iceberg-dissolution rates. The “median life” (before breaking) of icebergs less than 1000 m in horizontal dimension is estimated to be 0.2 a, which is significantly lower than was previously thought. The mean melt rate is estimated to be 0.12 m d –1 , which agrees broadly with previous laboratory studies. The relative contributions of melt, calving, and breakage, plus the enhancement effect of roll-over, are examined in estimating the natural dissolution rate. Breakage appears to be the dominant mechanism for larger icebergs with melt and calving able to explain the disappearance of icebergs in the smallest categories only (within the mean “median-life” period). Examination of the historical records of Captain Cook indicates that iceberg concentrations, as well as the northerly extent in this region 200 years ago, were compatible with the present data. |
format |
Article in Journal/Newspaper |
author |
Hamley, T. C. Budd, W. F. |
author_facet |
Hamley, T. C. Budd, W. F. |
author_sort |
Hamley, T. C. |
title |
Antarctic Iceberg Distribution and Dissolution |
title_short |
Antarctic Iceberg Distribution and Dissolution |
title_full |
Antarctic Iceberg Distribution and Dissolution |
title_fullStr |
Antarctic Iceberg Distribution and Dissolution |
title_full_unstemmed |
Antarctic Iceberg Distribution and Dissolution |
title_sort |
antarctic iceberg distribution and dissolution |
publisher |
Cambridge University Press (CUP) |
publishDate |
1986 |
url |
http://dx.doi.org/10.1017/s0022143000015574 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015574 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Iceberg* Journal of Glaciology Southern Ocean |
genre_facet |
Antarc* Antarctic Iceberg* Journal of Glaciology Southern Ocean |
op_source |
Journal of Glaciology volume 32, issue 111, page 242-251 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000015574 |
container_title |
Journal of Glaciology |
container_volume |
32 |
container_issue |
111 |
container_start_page |
242 |
op_container_end_page |
251 |
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1792507096544051200 |