Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water
Antarctic Intermediate Water is, at present, a water massthat brings oxygen to intermediate depths throughout theSouthern Hemisphere oceans. Models have suggested thatintermediate waters had higher concentrations of oxygenduring the last glacial period1,2, consistent with globallyreduced denitrifica...
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Online Access: | http://www.nature.com/ngeo/journal/v3/n1/abs/ngeo715.html https://doi.org/10.1038/ngeo715 http://ecite.utas.edu.au/67719 |
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ftunivtasecite:oai:ecite.utas.edu.au:67719 2023-05-15T13:35:38+02:00 Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water Muratli, JM Chase, Z Mix, AC McManus, J 2010 application/pdf http://www.nature.com/ngeo/journal/v3/n1/abs/ngeo715.html https://doi.org/10.1038/ngeo715 http://ecite.utas.edu.au/67719 en eng Nature Publishing Group http://ecite.utas.edu.au/67719/1/Muratli_NGEO_2010.pdf http://dx.doi.org/10.1038/ngeo715 Muratli, JM and Chase, Z and Mix, AC and McManus, J, Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water, Nature Geoscience, 3, (1) pp. 23-26. ISSN 1752-0894 (2010) [Refereed Article] http://ecite.utas.edu.au/67719 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2010 ftunivtasecite https://doi.org/10.1038/ngeo715 2019-12-13T21:36:14Z Antarctic Intermediate Water is, at present, a water massthat brings oxygen to intermediate depths throughout theSouthern Hemisphere oceans. Models have suggested thatintermediate waters had higher concentrations of oxygenduring the last glacial period1,2, consistent with globallyreduced denitrification3 and increased production of AntarcticIntermediate Water4. However, some palaeoceanographicreconstructions5,6 have indicated that production decreased inthe southeast Pacific Ocean at this time. Here we analyse theconcentrations of Re and Mn, the sedimentary concentrationsof which are controlled by the amount of dissolved oxygenat the sea floor, from three sediment cores located along theChilean margin for the past 30,000 years. Our results fromthe cores, which bracket the present-day water-column extentof Antarctic Intermediate Water, show that the depth rangeof well-oxygenated Antarctic Intermediate Water increasedoff Chile during the Last Glacial Maximum. Dissolved oxygencontent began to decrease approximately 17,000 years ago,coincident with rapid Antarctic warming and a poleward shiftof the southern westerly winds7. Our estimates of productivityfrom accumulation rates of organic carbon and opal do notco-vary with the seafloor oxygen variations, ruling out localcontrol of seafloor oxygenation. We conclude that the dataare best explained by a combination of increased oxygenationand increased flux of Antarctic Intermediate Water during theLast Glacial Maximum. Article in Journal/Newspaper Antarc* Antarctic eCite UTAS (University of Tasmania) Antarctic Pacific Nature Geoscience 3 1 23 26 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Muratli, JM Chase, Z Mix, AC McManus, J Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
Antarctic Intermediate Water is, at present, a water massthat brings oxygen to intermediate depths throughout theSouthern Hemisphere oceans. Models have suggested thatintermediate waters had higher concentrations of oxygenduring the last glacial period1,2, consistent with globallyreduced denitrification3 and increased production of AntarcticIntermediate Water4. However, some palaeoceanographicreconstructions5,6 have indicated that production decreased inthe southeast Pacific Ocean at this time. Here we analyse theconcentrations of Re and Mn, the sedimentary concentrationsof which are controlled by the amount of dissolved oxygenat the sea floor, from three sediment cores located along theChilean margin for the past 30,000 years. Our results fromthe cores, which bracket the present-day water-column extentof Antarctic Intermediate Water, show that the depth rangeof well-oxygenated Antarctic Intermediate Water increasedoff Chile during the Last Glacial Maximum. Dissolved oxygencontent began to decrease approximately 17,000 years ago,coincident with rapid Antarctic warming and a poleward shiftof the southern westerly winds7. Our estimates of productivityfrom accumulation rates of organic carbon and opal do notco-vary with the seafloor oxygen variations, ruling out localcontrol of seafloor oxygenation. We conclude that the dataare best explained by a combination of increased oxygenationand increased flux of Antarctic Intermediate Water during theLast Glacial Maximum. |
format |
Article in Journal/Newspaper |
author |
Muratli, JM Chase, Z Mix, AC McManus, J |
author_facet |
Muratli, JM Chase, Z Mix, AC McManus, J |
author_sort |
Muratli, JM |
title |
Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water |
title_short |
Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water |
title_full |
Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water |
title_fullStr |
Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water |
title_full_unstemmed |
Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water |
title_sort |
increased glacial-age ventilation of the chilean margin by antarctic intermediate water |
publisher |
Nature Publishing Group |
publishDate |
2010 |
url |
http://www.nature.com/ngeo/journal/v3/n1/abs/ngeo715.html https://doi.org/10.1038/ngeo715 http://ecite.utas.edu.au/67719 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://ecite.utas.edu.au/67719/1/Muratli_NGEO_2010.pdf http://dx.doi.org/10.1038/ngeo715 Muratli, JM and Chase, Z and Mix, AC and McManus, J, Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water, Nature Geoscience, 3, (1) pp. 23-26. ISSN 1752-0894 (2010) [Refereed Article] http://ecite.utas.edu.au/67719 |
op_doi |
https://doi.org/10.1038/ngeo715 |
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Nature Geoscience |
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3 |
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1 |
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23 |
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26 |
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1766068344513888256 |