Onset and Role of the Antarctic Circumpolar Current.
The major role for the ACC, as inferred in the past, is to have caused or stabilised full Antarctic glaciation. This role has since been questioned, and other hypothesised roles are relatively minor. Using a “smoking gun ” assumption, determination of the time of onset of an ACC will resolve uncerta...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.547.1173 2023-05-15T13:42:36+02:00 Onset and Role of the Antarctic Circumpolar Current. Peter F Barker Fabio Florindo Ellen E Martin Howard D Scher The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1173 http://www.earth-prints.org/bitstream/2122/2184/1/1214.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1173 http://www.earth-prints.org/bitstream/2122/2184/1/1214.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.earth-prints.org/bitstream/2122/2184/1/1214.pdf text ftciteseerx 2016-01-08T11:20:13Z The major role for the ACC, as inferred in the past, is to have caused or stabilised full Antarctic glaciation. This role has since been questioned, and other hypothesised roles are relatively minor. Using a “smoking gun ” assumption, determination of the time of onset of an ACC will resolve uncertainties in its role, and constrain the importance of ocean circulation to climate. To this end, we summarise all published estimates of ACC onset. The time of onset, of shallow circulation or deep, is extremely uncertain, whether based on tectonic studies or the interpretation of changes in the sediment record. Two potential final barriers to circumpolar flow have been identified; south of Tasmania and south of South America. The former is well-constrained by tectonics and marine geology to before 32 Ma for a deep gap, with a shallow gap in place by 35.5 Ma at the latest. These ages fit nicely with the onset of full Antarctic glaciation at 33-34 Ma, although some workers deny the causality. Estimates of the time of opening of the latter range very widely, whether based on tectonics or sedimentary geology, from as recently as 6 Ma to as early as 41 Ma, with the gap depth uncertain also. Resolution of the tectonics-based uncertainties by additional survey being most probably both time- Text Antarc* Antarctic Unknown Antarctic The Antarctic |
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English |
description |
The major role for the ACC, as inferred in the past, is to have caused or stabilised full Antarctic glaciation. This role has since been questioned, and other hypothesised roles are relatively minor. Using a “smoking gun ” assumption, determination of the time of onset of an ACC will resolve uncertainties in its role, and constrain the importance of ocean circulation to climate. To this end, we summarise all published estimates of ACC onset. The time of onset, of shallow circulation or deep, is extremely uncertain, whether based on tectonic studies or the interpretation of changes in the sediment record. Two potential final barriers to circumpolar flow have been identified; south of Tasmania and south of South America. The former is well-constrained by tectonics and marine geology to before 32 Ma for a deep gap, with a shallow gap in place by 35.5 Ma at the latest. These ages fit nicely with the onset of full Antarctic glaciation at 33-34 Ma, although some workers deny the causality. Estimates of the time of opening of the latter range very widely, whether based on tectonics or sedimentary geology, from as recently as 6 Ma to as early as 41 Ma, with the gap depth uncertain also. Resolution of the tectonics-based uncertainties by additional survey being most probably both time- |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Peter F Barker Fabio Florindo Ellen E Martin Howard D Scher |
spellingShingle |
Peter F Barker Fabio Florindo Ellen E Martin Howard D Scher Onset and Role of the Antarctic Circumpolar Current. |
author_facet |
Peter F Barker Fabio Florindo Ellen E Martin Howard D Scher |
author_sort |
Peter F Barker |
title |
Onset and Role of the Antarctic Circumpolar Current. |
title_short |
Onset and Role of the Antarctic Circumpolar Current. |
title_full |
Onset and Role of the Antarctic Circumpolar Current. |
title_fullStr |
Onset and Role of the Antarctic Circumpolar Current. |
title_full_unstemmed |
Onset and Role of the Antarctic Circumpolar Current. |
title_sort |
onset and role of the antarctic circumpolar current. |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1173 http://www.earth-prints.org/bitstream/2122/2184/1/1214.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
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Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://www.earth-prints.org/bitstream/2122/2184/1/1214.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.547.1173 http://www.earth-prints.org/bitstream/2122/2184/1/1214.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766169997852278784 |