Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene
An ensemble of new, high-resolution records of surface ocean hydrography from the Indian-Atlantic oceanic gateway, south of Africa, demonstrates recurrent and high-amplitude salinity oscillations in the Agulhas Leakage area during the penultimate glacial-interglacial cycle. A series of millennial-sc...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/64884 2024-01-14T10:09:05+01:00 Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene Marino, Gianluca Zahn, Rainer Ziegler, Martin Purcell, Conor Knorr, Gregor Hall, Ian R. Ziveri, Patrizia Elderfield, H http://hdl.handle.net/1885/64884 https://doi.org/10.1002/palo.20038 https://openresearch-repository.anu.edu.au/bitstream/1885/64884/5/01_Marino_Agulhas_salt-leakage_2013.pdf.jpg unknown American Geophysical Union 0883-8305 http://hdl.handle.net/1885/64884 doi:10.1002/palo.20038 https://openresearch-repository.anu.edu.au/bitstream/1885/64884/5/01_Marino_Agulhas_salt-leakage_2013.pdf.jpg Paleoceanography Keywords: atmospheric circulation climate variation glacial-interglacial cycle hydrography leakage overturn paleoceanography paleoclimate Pleistocene salt Southern Hemisphere Agulhas Current Atlantic Ocean Indian Ocean South Africa abrupt climate change Agulhas Leakage AMOC bipolar seesaw millennial-scale variability Southern Hemisphere atmospheric circulation Journal article ftanucanberra https://doi.org/10.1002/palo.20038 2023-12-15T09:32:46Z An ensemble of new, high-resolution records of surface ocean hydrography from the Indian-Atlantic oceanic gateway, south of Africa, demonstrates recurrent and high-amplitude salinity oscillations in the Agulhas Leakage area during the penultimate glacial-interglacial cycle. A series of millennial-scale salinification events, indicating strengthened salt leakage into the South Atlantic, appear to correlate with abrupt changes in the North Atlantic climate and Atlantic Meridional Overturning Circulation (AMOC). This interhemispheric coupling, which plausibly involved changes in the Hadley Cell and midlatitude westerlies that impacted the interocean transport at the tip of Africa, suggests that the Agulhas Leakage acted as a source of negative buoyancy for the perturbed AMOC, possibly aiding its return to full strength. Our finding points to the Indian-to-Atlantic salt transport as a potentially important modulator of the AMOC during the abrupt climate changes of the Late Pleistocene. Key Points Millennial-scale variability of the Agulhas LeakageConnection between Agulhas Leakage and bipolar seesawRelationship between Agulhas Leakage and abrupt climate change Article in Journal/Newspaper North Atlantic Australian National University: ANU Digital Collections Indian Paleoceanography 28 3 599 606 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: atmospheric circulation climate variation glacial-interglacial cycle hydrography leakage overturn paleoceanography paleoclimate Pleistocene salt Southern Hemisphere Agulhas Current Atlantic Ocean Indian Ocean South Africa abrupt climate change Agulhas Leakage AMOC bipolar seesaw millennial-scale variability Southern Hemisphere atmospheric circulation |
spellingShingle |
Keywords: atmospheric circulation climate variation glacial-interglacial cycle hydrography leakage overturn paleoceanography paleoclimate Pleistocene salt Southern Hemisphere Agulhas Current Atlantic Ocean Indian Ocean South Africa abrupt climate change Agulhas Leakage AMOC bipolar seesaw millennial-scale variability Southern Hemisphere atmospheric circulation Marino, Gianluca Zahn, Rainer Ziegler, Martin Purcell, Conor Knorr, Gregor Hall, Ian R. Ziveri, Patrizia Elderfield, H Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene |
topic_facet |
Keywords: atmospheric circulation climate variation glacial-interglacial cycle hydrography leakage overturn paleoceanography paleoclimate Pleistocene salt Southern Hemisphere Agulhas Current Atlantic Ocean Indian Ocean South Africa abrupt climate change Agulhas Leakage AMOC bipolar seesaw millennial-scale variability Southern Hemisphere atmospheric circulation |
description |
An ensemble of new, high-resolution records of surface ocean hydrography from the Indian-Atlantic oceanic gateway, south of Africa, demonstrates recurrent and high-amplitude salinity oscillations in the Agulhas Leakage area during the penultimate glacial-interglacial cycle. A series of millennial-scale salinification events, indicating strengthened salt leakage into the South Atlantic, appear to correlate with abrupt changes in the North Atlantic climate and Atlantic Meridional Overturning Circulation (AMOC). This interhemispheric coupling, which plausibly involved changes in the Hadley Cell and midlatitude westerlies that impacted the interocean transport at the tip of Africa, suggests that the Agulhas Leakage acted as a source of negative buoyancy for the perturbed AMOC, possibly aiding its return to full strength. Our finding points to the Indian-to-Atlantic salt transport as a potentially important modulator of the AMOC during the abrupt climate changes of the Late Pleistocene. Key Points Millennial-scale variability of the Agulhas LeakageConnection between Agulhas Leakage and bipolar seesawRelationship between Agulhas Leakage and abrupt climate change |
format |
Article in Journal/Newspaper |
author |
Marino, Gianluca Zahn, Rainer Ziegler, Martin Purcell, Conor Knorr, Gregor Hall, Ian R. Ziveri, Patrizia Elderfield, H |
author_facet |
Marino, Gianluca Zahn, Rainer Ziegler, Martin Purcell, Conor Knorr, Gregor Hall, Ian R. Ziveri, Patrizia Elderfield, H |
author_sort |
Marino, Gianluca |
title |
Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene |
title_short |
Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene |
title_full |
Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene |
title_fullStr |
Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene |
title_full_unstemmed |
Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene |
title_sort |
agulhas salt-leakage oscillations during abrupt climate changes of the late pleistocene |
publisher |
American Geophysical Union |
url |
http://hdl.handle.net/1885/64884 https://doi.org/10.1002/palo.20038 https://openresearch-repository.anu.edu.au/bitstream/1885/64884/5/01_Marino_Agulhas_salt-leakage_2013.pdf.jpg |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Paleoceanography |
op_relation |
0883-8305 http://hdl.handle.net/1885/64884 doi:10.1002/palo.20038 https://openresearch-repository.anu.edu.au/bitstream/1885/64884/5/01_Marino_Agulhas_salt-leakage_2013.pdf.jpg |
op_doi |
https://doi.org/10.1002/palo.20038 |
container_title |
Paleoceanography |
container_volume |
28 |
container_issue |
3 |
container_start_page |
599 |
op_container_end_page |
606 |
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1788063534535409664 |