Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages
Northern and southern hemispheric influences¡ªparticularly changes in Southern Hemisphere westerly winds (SSW) and Southern Ocean ventilation¡ªtriggered the stepwise atmospheric CO2 increase that accompanied the last deglaciation. One approach for gaining potential insights into past changes in SWW/...
Published in: | Quaternary Research |
---|---|
Main Authors: | , , , , , , , , |
Format: | Text |
Language: | English |
Published: |
Cambridge University Press (CUP)
|
Subjects: | |
Online Access: | https://doi.org/10.1017/qua.2021.12 https://archimer.ifremer.fr/doc/00689/80140/83193.pdf https://archimer.ifremer.fr/doc/00689/80140/83194.pdf https://archimer.ifremer.fr/doc/00689/80140/ |
id |
fttriple:oai:gotriple.eu:10670/1.t9tdpv |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:10670/1.t9tdpv 2023-05-15T13:59:11+02:00 Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages Moros, Matthias De Deckker, Patrick Perner, Kerstin Ninnemann, Ulysses S. Wacker, Lukas Telford, Richard Jansen, Eystein Blanz, Thomas Schneider, Ralph https://doi.org/10.1017/qua.2021.12 https://archimer.ifremer.fr/doc/00689/80140/83193.pdf https://archimer.ifremer.fr/doc/00689/80140/83194.pdf https://archimer.ifremer.fr/doc/00689/80140/ en eng Cambridge University Press (CUP) doi:10.1017/qua.2021.12 10670/1.t9tdpv https://archimer.ifremer.fr/doc/00689/80140/83193.pdf https://archimer.ifremer.fr/doc/00689/80140/83194.pdf https://archimer.ifremer.fr/doc/00689/80140/ other Archimer, archive institutionnelle de l'Ifremer Quaternary Research (0033-5894) (Cambridge University Press (CUP)), 2021-07 , Vol. 102 , P. 130-141 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1017/qua.2021.12 2023-01-22T18:37:26Z Northern and southern hemispheric influences¡ªparticularly changes in Southern Hemisphere westerly winds (SSW) and Southern Ocean ventilation¡ªtriggered the stepwise atmospheric CO2 increase that accompanied the last deglaciation. One approach for gaining potential insights into past changes in SWW/CO2 upwelling is to reconstruct the positions of the northern oceanic fronts associated with the Antarctic Circumpolar Current. Using two deep-sea cores located ¡«600 km apart off the southern coast of Australia, we detail oceanic changes from ¡«23 to 6 ka using foraminifer faunal and biomarker alkenone records. Our results indicate a tight coupling between hydrographic and related frontal displacements offshore South Australia (and by analogy, possibly the entire Southern Ocean) and Northern Hemisphere (NH) climate that may help confirm previous hypotheses that the westerlies play a critical role in modulating CO2 uptake and release from the Southern Ocean on millennial and potentially even centennial timescales. The intensity and extent of the northward displacements of the Subtropical Front following well-known NH cold events seem to decrease with progressing NH ice sheet deglaciation and parallel a weakening NH temperature response and amplitude of Intertropical Convergence Zone shifts. In addition, an exceptional poleward shift of Southern Hemisphere fronts occurs during the NH Heinrich Stadial 1. This event was likely facilitated by the NH ice maximum and acted as a coup-de-grace for glacial ocean stratification and its high CO2 capacitance. Thus, through its influence on the global atmosphere and on ocean mixing, ¡°excessive¡± NH glaciation could have triggered its own demise by facilitating the destratification of the glacial ocean CO2 state. Text Antarc* Antarctic Ice Sheet Southern Ocean Unknown Antarctic Southern Ocean The Antarctic Quaternary Research 102 130 141 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir Moros, Matthias De Deckker, Patrick Perner, Kerstin Ninnemann, Ulysses S. Wacker, Lukas Telford, Richard Jansen, Eystein Blanz, Thomas Schneider, Ralph Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages |
topic_facet |
geo envir |
description |
Northern and southern hemispheric influences¡ªparticularly changes in Southern Hemisphere westerly winds (SSW) and Southern Ocean ventilation¡ªtriggered the stepwise atmospheric CO2 increase that accompanied the last deglaciation. One approach for gaining potential insights into past changes in SWW/CO2 upwelling is to reconstruct the positions of the northern oceanic fronts associated with the Antarctic Circumpolar Current. Using two deep-sea cores located ¡«600 km apart off the southern coast of Australia, we detail oceanic changes from ¡«23 to 6 ka using foraminifer faunal and biomarker alkenone records. Our results indicate a tight coupling between hydrographic and related frontal displacements offshore South Australia (and by analogy, possibly the entire Southern Ocean) and Northern Hemisphere (NH) climate that may help confirm previous hypotheses that the westerlies play a critical role in modulating CO2 uptake and release from the Southern Ocean on millennial and potentially even centennial timescales. The intensity and extent of the northward displacements of the Subtropical Front following well-known NH cold events seem to decrease with progressing NH ice sheet deglaciation and parallel a weakening NH temperature response and amplitude of Intertropical Convergence Zone shifts. In addition, an exceptional poleward shift of Southern Hemisphere fronts occurs during the NH Heinrich Stadial 1. This event was likely facilitated by the NH ice maximum and acted as a coup-de-grace for glacial ocean stratification and its high CO2 capacitance. Thus, through its influence on the global atmosphere and on ocean mixing, ¡°excessive¡± NH glaciation could have triggered its own demise by facilitating the destratification of the glacial ocean CO2 state. |
format |
Text |
author |
Moros, Matthias De Deckker, Patrick Perner, Kerstin Ninnemann, Ulysses S. Wacker, Lukas Telford, Richard Jansen, Eystein Blanz, Thomas Schneider, Ralph |
author_facet |
Moros, Matthias De Deckker, Patrick Perner, Kerstin Ninnemann, Ulysses S. Wacker, Lukas Telford, Richard Jansen, Eystein Blanz, Thomas Schneider, Ralph |
author_sort |
Moros, Matthias |
title |
Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages |
title_short |
Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages |
title_full |
Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages |
title_fullStr |
Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages |
title_full_unstemmed |
Hydrographic shifts south of Australia over the last deglaciation and possible interhemispheric linkages |
title_sort |
hydrographic shifts south of australia over the last deglaciation and possible interhemispheric linkages |
publisher |
Cambridge University Press (CUP) |
url |
https://doi.org/10.1017/qua.2021.12 https://archimer.ifremer.fr/doc/00689/80140/83193.pdf https://archimer.ifremer.fr/doc/00689/80140/83194.pdf https://archimer.ifremer.fr/doc/00689/80140/ |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Quaternary Research (0033-5894) (Cambridge University Press (CUP)), 2021-07 , Vol. 102 , P. 130-141 |
op_relation |
doi:10.1017/qua.2021.12 10670/1.t9tdpv https://archimer.ifremer.fr/doc/00689/80140/83193.pdf https://archimer.ifremer.fr/doc/00689/80140/83194.pdf https://archimer.ifremer.fr/doc/00689/80140/ |
op_rights |
other |
op_doi |
https://doi.org/10.1017/qua.2021.12 |
container_title |
Quaternary Research |
container_volume |
102 |
container_start_page |
130 |
op_container_end_page |
141 |
_version_ |
1766267661489012736 |