4011 15 archive 337 disk0/00/00/40/11 2008-04-07 14:17:49 2008-07-18 10:48:00 2008-07-16 17:04:08 article show Jo.Jacka@utas.edu.au Jacka TH Jo.Jacka@utas.edu.au Giles AB Barry.Giles@utas.edu.au pub 040602 260115 969902 770305 restricted http://www.igsoc.org/journal/copyright.html category => A1 categoryDesc => Refereed Article in a Scholarly Journal eprintID => 0 field1 => Journal of Glaciology field10 => field11 => field12 => field13 => field2 => "Cambridge, England" field3 => 53 field4 => 182 field5 => 341-356 field6 => International Glaciological Society field7 => 0022-1430 field8 => field9 => funding => S grant => lastUpdate => 18/02/2008 rfcd => 260115 seo => 770305 themeArea => AMS title => Antarctic iceberg distribution and dissolution from ship-based observations tor => PB uid => 50245 update => no 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. 2007 published Journal of Glaciology 53 182 International Glaciological Society 341-356 10.3189/002214307783258521 TRUE 0022-1430 http://dx.doi.org/10.3189/002214307783258521 4780 4 4011 1 application/pdf en staffonly cc_utas

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