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| Titel |
Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades |
| VerfasserIn |
J. L. Roberts, A. D. Moy, T. D. Ommen, M. A. J. Curran, A. P. Worby, I. D. Goodwin, M. Inoue |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 1 ; Nr. 7, no. 1 (2013-02-11), S.263-273 |
| Datensatznummer |
250017418
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| Publikation (Nr.) |
 copernicus.org/tc-7-263-2013.pdf |
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| Zusammenfassung |
| 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. |
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