Antarctic iceberg distribution and dissolution from ship-based observations
journal contribution
posted on 2023-05-16, 21:07authored byJacka, TH, Alan Giles
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.
History
Publication title
Journal of Glaciology
Volume
53
Issue
182
Pagination
341-356
ISSN
0022-1430
Department/School
Institute for Marine and Antarctic Studies
Publisher
International Glaciological Society
Place of publication
Cambridge, England
Repository Status
Restricted
Socio-economic Objectives
Oceanic processes (excl. in the Antarctic and Southern Ocean)