Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications
The Antarctic Polar Front is an important biogeochemical divider in the Southern Ocean. Laminated diatom mat deposits record episodes of massive flux of the diatom Thalassiothrix antarctica beneath the Antarctic Polar Front and provide a marker for tracking the migration of the Front through time. O...
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ftsouthampton:oai:eprints.soton.ac.uk:163655 2023-08-27T04:06:15+02:00 Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications Kemp, A.E.S. Grigorov, I. Pearce, Richard B. Naveira Garabato, A.C. 2010-08 text https://eprints.soton.ac.uk/163655/ https://eprints.soton.ac.uk/163655/1/Kemp_et_al_QSR2010.pdf en eng https://eprints.soton.ac.uk/163655/1/Kemp_et_al_QSR2010.pdf Kemp, A.E.S., Grigorov, I., Pearce, Richard B. and Naveira Garabato, A.C. (2010) Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications. Quaternary Science Reviews, 29 (17-18), 1993-2009. (doi:10.1016/j.quascirev.2010.04.027 <http://dx.doi.org/10.1016/j.quascirev.2010.04.027>). Article PeerReviewed 2010 ftsouthampton https://doi.org/10.1016/j.quascirev.2010.04.027 2023-08-03T22:19:34Z The Antarctic Polar Front is an important biogeochemical divider in the Southern Ocean. Laminated diatom mat deposits record episodes of massive flux of the diatom Thalassiothrix antarctica beneath the Antarctic Polar Front and provide a marker for tracking the migration of the Front through time. Ocean Drilling Program Sites 1091, 1093 and 1094 are the only deep piston cored record hitherto sampled from the sediments of the circumpolar biogenic opal belt. Mapping of diatom mat deposits between these sites indicates a glacial-interglacial front migration of up to 6 degrees of latitude in the early / mid Pleistocene. The mid Pleistocene transition marks a stepwise minimum 7 degree northward migration of the locus of the Polar Front sustained for about 450 kyr until an abrupt southward return to a locus similar to its modern position and further south than any mid-Pleistocene locus. This interval from a “900 ka event” that saw major cooling of the oceans and a ?13C minimum through to the 424 ka Mid-Brunhes Event at Termination V is also seemingly characterised by 1) sustained decreased carbonate in the subtropical south Atlantic, 2) reduced strength of Antarctic deep meridional circulation, 3) lower interglacial temperatures and lower interglacial atmospheric CO2 levels (by some 30 per mil) than those of the last 400 kyr, evidencing less complete deglaciation. This evidence is consistent with a prolonged period lasting 450 kyr of only partial ventilation of the deep ocean during interglacials and suggests that the mechanisms highlighted by recent hypotheses linking mid-latitude atmospheric conditions to the extent of deep ocean ventilation and carbon sequestration over glacial-interglacial cycles are likely in operation during the longer time scale characteristic of the Mid-Pleistocene Transition. The cooling that initiated the “900 ka event” may have been driven by minima in insolation amplitude related to eccentricity modulation of precession that also affected low latitude climates as marked by threshold ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean University of Southampton: e-Prints Soton Antarctic Southern Ocean The Antarctic Quaternary Science Reviews 29 17-18 1993 2009 |
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Open Polar |
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University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
The Antarctic Polar Front is an important biogeochemical divider in the Southern Ocean. Laminated diatom mat deposits record episodes of massive flux of the diatom Thalassiothrix antarctica beneath the Antarctic Polar Front and provide a marker for tracking the migration of the Front through time. Ocean Drilling Program Sites 1091, 1093 and 1094 are the only deep piston cored record hitherto sampled from the sediments of the circumpolar biogenic opal belt. Mapping of diatom mat deposits between these sites indicates a glacial-interglacial front migration of up to 6 degrees of latitude in the early / mid Pleistocene. The mid Pleistocene transition marks a stepwise minimum 7 degree northward migration of the locus of the Polar Front sustained for about 450 kyr until an abrupt southward return to a locus similar to its modern position and further south than any mid-Pleistocene locus. This interval from a “900 ka event” that saw major cooling of the oceans and a ?13C minimum through to the 424 ka Mid-Brunhes Event at Termination V is also seemingly characterised by 1) sustained decreased carbonate in the subtropical south Atlantic, 2) reduced strength of Antarctic deep meridional circulation, 3) lower interglacial temperatures and lower interglacial atmospheric CO2 levels (by some 30 per mil) than those of the last 400 kyr, evidencing less complete deglaciation. This evidence is consistent with a prolonged period lasting 450 kyr of only partial ventilation of the deep ocean during interglacials and suggests that the mechanisms highlighted by recent hypotheses linking mid-latitude atmospheric conditions to the extent of deep ocean ventilation and carbon sequestration over glacial-interglacial cycles are likely in operation during the longer time scale characteristic of the Mid-Pleistocene Transition. The cooling that initiated the “900 ka event” may have been driven by minima in insolation amplitude related to eccentricity modulation of precession that also affected low latitude climates as marked by threshold ... |
format |
Article in Journal/Newspaper |
author |
Kemp, A.E.S. Grigorov, I. Pearce, Richard B. Naveira Garabato, A.C. |
spellingShingle |
Kemp, A.E.S. Grigorov, I. Pearce, Richard B. Naveira Garabato, A.C. Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications |
author_facet |
Kemp, A.E.S. Grigorov, I. Pearce, Richard B. Naveira Garabato, A.C. |
author_sort |
Kemp, A.E.S. |
title |
Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications |
title_short |
Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications |
title_full |
Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications |
title_fullStr |
Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications |
title_full_unstemmed |
Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications |
title_sort |
migration of the antarctic polar front through the mid-pleistocene transition: evidence and climatic implications |
publishDate |
2010 |
url |
https://eprints.soton.ac.uk/163655/ https://eprints.soton.ac.uk/163655/1/Kemp_et_al_QSR2010.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/163655/1/Kemp_et_al_QSR2010.pdf Kemp, A.E.S., Grigorov, I., Pearce, Richard B. and Naveira Garabato, A.C. (2010) Migration of the Antarctic Polar Front through the mid-Pleistocene transition: evidence and climatic implications. Quaternary Science Reviews, 29 (17-18), 1993-2009. (doi:10.1016/j.quascirev.2010.04.027 <http://dx.doi.org/10.1016/j.quascirev.2010.04.027>). |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.04.027 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
17-18 |
container_start_page |
1993 |
op_container_end_page |
2009 |
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1775347058239078400 |