University Of Tasmania
tc-7-263-2013.pdf (2.63 MB)

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

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journal contribution
posted on 2023-05-17, 16:29 authored by Jason RobertsJason Roberts, Andrew MoyAndrew Moy, Tasman van OmmenTasman van Ommen, Mark Curran, Worby, AP, Goodwin, ID, Mana Inoue
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.


Publication title

The Cryosphere








Institute for Marine and Antarctic Studies


Copernicus GmbH

Place of publication


Rights statement

Copyright 2013 the authors.

Repository Status

  • Open

Socio-economic Objectives

Climate variability (excl. social impacts)

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    University Of Tasmania