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Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades


Roberts, JL and Moy, AD and van Ommen, TD and Curran, MAJ and Worby, AP and Goodwin, ID and Inoue, M, Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades, The Cryosphere, 7 pp. 263-273. ISSN 1994-0416 (2013) [Refereed Article]


Copyright Statement

Copyright 2013 the authors.

DOI: doi:10.5194/tc-7-263-2013


A borehole temperature record from the Mill Island (East Antarctica) icecap reveals a large surface warming signal manifested as a 0.75 K temperature difference over the approximate 100 m depth in the zone of zero annual amplitude below the seasonally varying zone. The temperature profile shows a break in gradient around 49 m depth, which we model with inverse numerical simulations, indicating that surface warming started around the austral summer of 1980/81 AD 5 yr. This warming of approximately 0.37 K per decade is consistent with trends seen in both instrumental and other reconstructions for Antarctica and, therefore, suggests that regional- rather than local-scale processes are largely responsible. Alteration of the surface energy budget arising from changes in radiation balances due to local cloud, the amount of liquid deposition and local air temperatures associated with altered air/sea exchanges also potentially plays a role at this location due to the proximity of the Shackleton Ice Shelf and sea-ice zone.

Item Details

Item Type:Refereed Article
Keywords:Antarctica, temperature reconstruction, borehole
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Palaeoclimatology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Roberts, JL (Dr Jason Roberts)
UTAS Author:Moy, AD (Dr Andrew Moy)
UTAS Author:van Ommen, TD (Dr Tas van Ommen)
UTAS Author:Curran, MAJ (Dr Mark Curran)
UTAS Author:Worby, AP (Professor Anthony Worby)
UTAS Author:Inoue, M (Dr Mana Inoue)
ID Code:83213
Year Published:2013
Web of Science® Times Cited:10
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-03-06
Last Modified:2014-05-16
Downloads:341 View Download Statistics

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