Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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
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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ftdatacite:10.1594/pangaea.816359 2023-05-15T13:33:00+02:00 Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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 Kemp, Alan E S Grigorov, Ivo Pearce, Richard B Naveira Garabato, Alberto C 2010 application/zip https://dx.doi.org/10.1594/pangaea.816359 https://doi.pangaea.de/10.1594/PANGAEA.816359 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.quascirev.2010.04.027 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 2010 ftdatacite https://doi.org/10.1594/pangaea.816359 https://doi.org/10.1016/j.quascirev.2010.04.027 2022-02-08T16:24:46Z 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° 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 d13C minimum through to the 424 ka Mid-Brunhes Event at Termination V is also seemingly characterised by 1) sustained decreased carbonate in the sub-tropical 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 changes in the African monsoon system. The major thresholds in earth system behaviour through the mid-Pleistocene transition were likely governed by an interplay of the 100 kyr and 400 kyr eccentricity modulation of precession. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Kemp, Alan E S Grigorov, Ivo Pearce, Richard B Naveira Garabato, Alberto C Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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 |
topic_facet |
Ocean Drilling Program ODP |
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° 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 d13C minimum through to the 424 ka Mid-Brunhes Event at Termination V is also seemingly characterised by 1) sustained decreased carbonate in the sub-tropical 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 changes in the African monsoon system. The major thresholds in earth system behaviour through the mid-Pleistocene transition were likely governed by an interplay of the 100 kyr and 400 kyr eccentricity modulation of precession. |
format |
Article in Journal/Newspaper |
author |
Kemp, Alan E S Grigorov, Ivo Pearce, Richard B Naveira Garabato, Alberto C |
author_facet |
Kemp, Alan E S Grigorov, Ivo Pearce, Richard B Naveira Garabato, Alberto C |
author_sort |
Kemp, Alan E S |
title |
Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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 |
title_short |
Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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 |
title_full |
Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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 |
title_fullStr |
Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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 |
title_full_unstemmed |
Age-depth relation and red colour reflectance of ODP Leg 177 sites, supplement to: Kemp, Alan E S; Grigorov, Ivo; Pearce, Richard B; Naveira Garabato, Alberto 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 |
title_sort |
age-depth relation and red colour reflectance of odp leg 177 sites, supplement to: kemp, alan e s; grigorov, ivo; pearce, richard b; naveira garabato, alberto 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 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2010 |
url |
https://dx.doi.org/10.1594/pangaea.816359 https://doi.pangaea.de/10.1594/PANGAEA.816359 |
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://dx.doi.org/10.1016/j.quascirev.2010.04.027 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.816359 https://doi.org/10.1016/j.quascirev.2010.04.027 |
_version_ |
1766037515640242176 |