Journal article

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

JL Roberts, AD Moy, TD van Ommen, MAJ Curran, AP Worby, ID Goodwin, M Inoue

The Cryosphere | COPERNICUS GESELLSCHAFT MBH | Published : 2013

Abstract

A borehole temperature record from the Mill Island (East Antarctica) icecap reveals a large surface warming signal manifested as a 0.75K temperature difference over the approximate 100m depth in the zone of zero annual amplitude below the seasonally varying zone. The temperature profile shows a break in gradient around 49m depth, which we model with inverse numerical simulations, indicating that surface warming started around the austral summer of 1980/81AD±5 yr. This warming of approximately 0.37K 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 respon..

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Grants

Awarded by Australian Antarctic Division


Funding Acknowledgements

The Australian Antarctic Division provided funding and logistical support (ASAC 1236). This work was supported by the Australian Government's Cooperative Research Centres Programme through the Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC).