Northern ice discharges and Antarctic warming: could ocean eddies provide the link?
A mechanism is advanced for explaining the Antarctic warm events from 90 to 30ka BP which involves meltwater-induced changes in the salinity gradient across the Antarctic Circumpolar Current (ACC) and consequent changes in the poleward heat transport by ocean eddies. Based on simple linear scale ana...
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Online Access: | https://oceanrep.geomar.de/id/eprint/3834/ https://oceanrep.geomar.de/id/eprint/3834/1/Keeling.pdf https://doi.org/10.1016/j.quascirev.2005.04.005 |
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ftoceanrep:oai:oceanrep.geomar.de:3834 2024-09-15T17:47:52+00:00 Northern ice discharges and Antarctic warming: could ocean eddies provide the link? Keeling , R. F. Visbeck, Martin 2005 text https://oceanrep.geomar.de/id/eprint/3834/ https://oceanrep.geomar.de/id/eprint/3834/1/Keeling.pdf https://doi.org/10.1016/j.quascirev.2005.04.005 en eng Elsevier https://oceanrep.geomar.de/id/eprint/3834/1/Keeling.pdf Keeling , R. F. and Visbeck, M. (2005) Northern ice discharges and Antarctic warming: could ocean eddies provide the link?. Quaternary Science Reviews, 24 (16-17). pp. 1809-1820. DOI 10.1016/j.quascirev.2005.04.005 <https://doi.org/10.1016/j.quascirev.2005.04.005>. doi:10.1016/j.quascirev.2005.04.005 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2005 ftoceanrep https://doi.org/10.1016/j.quascirev.2005.04.005 2024-09-04T05:04:40Z A mechanism is advanced for explaining the Antarctic warm events from 90 to 30ka BP which involves meltwater-induced changes in the salinity gradient across the Antarctic Circumpolar Current (ACC) and consequent changes in the poleward heat transport by ocean eddies. Based on simple linear scale analysis, the mechanism is shown to yield warming in the Antarctic interior of roughly the magnitude seen in Antarctic ice-core records (∼2 °C) in response to ice discharges into the North Atlantic. Consistent with observations, the mechanism produces gradual Antarctic warming and cooling, as dictated by the time required for salinity anomalies to build up and dissipate across the ACC. The mechanism also allows the onset of warming or cooling to be tied to changes in Atlantic overturning, which is relevant here, not for influencing ocean heat transport directly, but for influencing the routing of meltwater from the North Atlantic into the Southern Ocean. The ideas presented here highlight the possibility that eddy processes in the ocean may play a first-order role in aspects of climate variability on millennial time scales. Article in Journal/Newspaper Antarc* Antarctic ice core North Atlantic Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Quaternary Science Reviews 24 16-17 1809 1820 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
A mechanism is advanced for explaining the Antarctic warm events from 90 to 30ka BP which involves meltwater-induced changes in the salinity gradient across the Antarctic Circumpolar Current (ACC) and consequent changes in the poleward heat transport by ocean eddies. Based on simple linear scale analysis, the mechanism is shown to yield warming in the Antarctic interior of roughly the magnitude seen in Antarctic ice-core records (∼2 °C) in response to ice discharges into the North Atlantic. Consistent with observations, the mechanism produces gradual Antarctic warming and cooling, as dictated by the time required for salinity anomalies to build up and dissipate across the ACC. The mechanism also allows the onset of warming or cooling to be tied to changes in Atlantic overturning, which is relevant here, not for influencing ocean heat transport directly, but for influencing the routing of meltwater from the North Atlantic into the Southern Ocean. The ideas presented here highlight the possibility that eddy processes in the ocean may play a first-order role in aspects of climate variability on millennial time scales. |
format |
Article in Journal/Newspaper |
author |
Keeling , R. F. Visbeck, Martin |
spellingShingle |
Keeling , R. F. Visbeck, Martin Northern ice discharges and Antarctic warming: could ocean eddies provide the link? |
author_facet |
Keeling , R. F. Visbeck, Martin |
author_sort |
Keeling , R. F. |
title |
Northern ice discharges and Antarctic warming: could ocean eddies provide the link? |
title_short |
Northern ice discharges and Antarctic warming: could ocean eddies provide the link? |
title_full |
Northern ice discharges and Antarctic warming: could ocean eddies provide the link? |
title_fullStr |
Northern ice discharges and Antarctic warming: could ocean eddies provide the link? |
title_full_unstemmed |
Northern ice discharges and Antarctic warming: could ocean eddies provide the link? |
title_sort |
northern ice discharges and antarctic warming: could ocean eddies provide the link? |
publisher |
Elsevier |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/3834/ https://oceanrep.geomar.de/id/eprint/3834/1/Keeling.pdf https://doi.org/10.1016/j.quascirev.2005.04.005 |
genre |
Antarc* Antarctic ice core North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic ice core North Atlantic Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/3834/1/Keeling.pdf Keeling , R. F. and Visbeck, M. (2005) Northern ice discharges and Antarctic warming: could ocean eddies provide the link?. Quaternary Science Reviews, 24 (16-17). pp. 1809-1820. DOI 10.1016/j.quascirev.2005.04.005 <https://doi.org/10.1016/j.quascirev.2005.04.005>. doi:10.1016/j.quascirev.2005.04.005 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2005.04.005 |
container_title |
Quaternary Science Reviews |
container_volume |
24 |
container_issue |
16-17 |
container_start_page |
1809 |
op_container_end_page |
1820 |
_version_ |
1810497541269094400 |