Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades
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 br...
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ftcopernicus:oai:publications.copernicus.org:tc15898 2023-05-15T13:54:27+02:00 Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades Roberts, J. L. Moy, A. D. Ommen, T. D. Curran, M. A. J. Worby, A. P. Goodwin, I. D. Inoue, M. 2018-09-27 application/pdf https://doi.org/10.5194/tc-7-263-2013 https://tc.copernicus.org/articles/7/263/2013/ eng eng doi:10.5194/tc-7-263-2013 https://tc.copernicus.org/articles/7/263/2013/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-7-263-2013 2020-07-20T16:25:34Z 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. Text Antarc* Antarctica East Antarctica Ice Shelf Mill Island Sea ice Shackleton Ice Shelf Copernicus Publications: E-Journals Austral East Antarctica Mill Island ENVELOPE(100.667,100.667,-65.500,-65.500) Shackleton Shackleton Ice Shelf ENVELOPE(100.504,100.504,-65.996,-65.996) The Cryosphere 7 1 263 273 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
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. |
format |
Text |
author |
Roberts, J. L. Moy, A. D. Ommen, T. D. Curran, M. A. J. Worby, A. P. Goodwin, I. D. Inoue, M. |
spellingShingle |
Roberts, J. L. Moy, A. D. Ommen, T. D. Curran, M. A. J. Worby, A. P. Goodwin, I. D. Inoue, M. Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades |
author_facet |
Roberts, J. L. Moy, A. D. Ommen, T. D. Curran, M. A. J. Worby, A. P. Goodwin, I. D. Inoue, M. |
author_sort |
Roberts, J. L. |
title |
Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades |
title_short |
Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades |
title_full |
Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades |
title_fullStr |
Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades |
title_full_unstemmed |
Borehole temperatures reveal a changed energy budget at Mill Island, East Antarctica, over recent decades |
title_sort |
borehole temperatures reveal a changed energy budget at mill island, east antarctica, over recent decades |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-7-263-2013 https://tc.copernicus.org/articles/7/263/2013/ |
long_lat |
ENVELOPE(100.667,100.667,-65.500,-65.500) ENVELOPE(100.504,100.504,-65.996,-65.996) |
geographic |
Austral East Antarctica Mill Island Shackleton Shackleton Ice Shelf |
geographic_facet |
Austral East Antarctica Mill Island Shackleton Shackleton Ice Shelf |
genre |
Antarc* Antarctica East Antarctica Ice Shelf Mill Island Sea ice Shackleton Ice Shelf |
genre_facet |
Antarc* Antarctica East Antarctica Ice Shelf Mill Island Sea ice Shackleton Ice Shelf |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-7-263-2013 https://tc.copernicus.org/articles/7/263/2013/ |
op_doi |
https://doi.org/10.5194/tc-7-263-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
1 |
container_start_page |
263 |
op_container_end_page |
273 |
_version_ |
1766260383994085376 |