Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time
Southern Hemisphere (SH) dust depositions recorded major changes in origin and flux intensity during the Last Glacial-Interglacial Transition (LGIT) reflecting modifications in atmospheric circulation. Dust archives from ice cores have shown compelling evidence that Southern South America (SSA) is t...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/359209 2023-08-27T04:06:03+02:00 Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time Mattielli, Nadine Gili, Stefania Boxho, Sibylle Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Chaput, Amélie King, James Gaiero, Diego Delmonte, Barbara Villelonga, Paul Formenti, Paola Gabrielli, Paolo Bonneville, Steeve 2023-06 1 full-text file(s): application/octet-stream http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359209 https://dipot.ulb.ac.be/dspace/bitstream/2013/359209/3/20222 en eng https://dipot.ulb.ac.be/dspace/bitstream/2013/359209/3/20222 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359209 1 full-text file(s): info:eu-repo/semantics/openAccess In: Goldschmidt 2023 Conference Glaciologie Géochimie info:eu-repo/semantics/conferencePaper info:ulb-repo/semantics/conferenceAbstract info:ulb-repo/semantics/openurl/document 2023 ftunivbruxelles 2023-08-09T22:23:14Z Southern Hemisphere (SH) dust depositions recorded major changes in origin and flux intensity during the Last Glacial-Interglacial Transition (LGIT) reflecting modifications in atmospheric circulation. Dust archives from ice cores have shown compelling evidence that Southern South America (SSA) is the major dust supplier to Antarctica. However, there is yet no consensus on contributions from secondary Potential Source Areas (PSAs) such as, Australia, New Zealand, Southern Africa (SAF), and Antarctica itself. Among those, SAF is a vast PSA that has been, so far, largely understudied. With a main focus on the Namibian coast in SAF, this work presents an innovative and multi-proxy approach for the identification and quantification of the SH PSAs for Antarctica and the Southern Ocean during the LGIT. We developed a statistical algorithm (complemented with Monte Carlo simulations) combining Rare Earth Elements from well-known PSAs in SH to provide the best fit to the REE patterns measured in EPICA Dronning Maud Land (EDML) allowing for the provenance identification and quantification. Our results provide the first high-resolution and continuous record of the PSAs contribution in the South Atlantic sector of East Antarctica from 26.5kyr to 7.5kyr BP. A major shift is observed at ~14.5kyr BP where the contribution (and thus flux) from Patagonia, the main dust supplier during the Last Glacial Maximum, fell from ̴70% to ̴45%. In the Early Holocene, SAF (~25%) and to a lesser extent Australia and New Zealand became more prevalent[1]. In addition, Sr, Nd and Pb isotopic compositions from the SH PSAs were compared with the East Antarctica dust signature[2]. In agreement with our REE results, during the last glacial climatic periods, East Antarctica dust isotopic composition (EDC & Vostok ice cores) is very uniform converging to an unequivocal SSA signature. In contrast, interglacial dust depositions (in agreement with South Atlantic sediments) show more extreme negative eNd and radiogenic 87Sr/86Sr, typical of the SAF ... Conference Object Antarc* Antarctica Dronning Maud Land East Antarctica EPICA Southern Ocean DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Dronning Maud Land East Antarctica New Zealand Patagonia Southern Ocean |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Glaciologie Géochimie |
spellingShingle |
Glaciologie Géochimie Mattielli, Nadine Gili, Stefania Boxho, Sibylle Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Chaput, Amélie King, James Gaiero, Diego Delmonte, Barbara Villelonga, Paul Formenti, Paola Gabrielli, Paolo Bonneville, Steeve Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time |
topic_facet |
Glaciologie Géochimie |
description |
Southern Hemisphere (SH) dust depositions recorded major changes in origin and flux intensity during the Last Glacial-Interglacial Transition (LGIT) reflecting modifications in atmospheric circulation. Dust archives from ice cores have shown compelling evidence that Southern South America (SSA) is the major dust supplier to Antarctica. However, there is yet no consensus on contributions from secondary Potential Source Areas (PSAs) such as, Australia, New Zealand, Southern Africa (SAF), and Antarctica itself. Among those, SAF is a vast PSA that has been, so far, largely understudied. With a main focus on the Namibian coast in SAF, this work presents an innovative and multi-proxy approach for the identification and quantification of the SH PSAs for Antarctica and the Southern Ocean during the LGIT. We developed a statistical algorithm (complemented with Monte Carlo simulations) combining Rare Earth Elements from well-known PSAs in SH to provide the best fit to the REE patterns measured in EPICA Dronning Maud Land (EDML) allowing for the provenance identification and quantification. Our results provide the first high-resolution and continuous record of the PSAs contribution in the South Atlantic sector of East Antarctica from 26.5kyr to 7.5kyr BP. A major shift is observed at ~14.5kyr BP where the contribution (and thus flux) from Patagonia, the main dust supplier during the Last Glacial Maximum, fell from ̴70% to ̴45%. In the Early Holocene, SAF (~25%) and to a lesser extent Australia and New Zealand became more prevalent[1]. In addition, Sr, Nd and Pb isotopic compositions from the SH PSAs were compared with the East Antarctica dust signature[2]. In agreement with our REE results, during the last glacial climatic periods, East Antarctica dust isotopic composition (EDC & Vostok ice cores) is very uniform converging to an unequivocal SSA signature. In contrast, interglacial dust depositions (in agreement with South Atlantic sediments) show more extreme negative eNd and radiogenic 87Sr/86Sr, typical of the SAF ... |
format |
Conference Object |
author |
Mattielli, Nadine Gili, Stefania Boxho, Sibylle Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Chaput, Amélie King, James Gaiero, Diego Delmonte, Barbara Villelonga, Paul Formenti, Paola Gabrielli, Paolo Bonneville, Steeve |
author_facet |
Mattielli, Nadine Gili, Stefania Boxho, Sibylle Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Chaput, Amélie King, James Gaiero, Diego Delmonte, Barbara Villelonga, Paul Formenti, Paola Gabrielli, Paolo Bonneville, Steeve |
author_sort |
Mattielli, Nadine |
title |
Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time |
title_short |
Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time |
title_full |
Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time |
title_fullStr |
Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time |
title_full_unstemmed |
Rare Earth Elements and Radiogenic Isotopes from Mineral Dust in East Antarctica: Sensitive Tracers of the Atmospheric Circulation and Climate Variability Through Time |
title_sort |
rare earth elements and radiogenic isotopes from mineral dust in east antarctica: sensitive tracers of the atmospheric circulation and climate variability through time |
publishDate |
2023 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359209 https://dipot.ulb.ac.be/dspace/bitstream/2013/359209/3/20222 |
geographic |
Dronning Maud Land East Antarctica New Zealand Patagonia Southern Ocean |
geographic_facet |
Dronning Maud Land East Antarctica New Zealand Patagonia Southern Ocean |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica EPICA Southern Ocean |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica EPICA Southern Ocean |
op_source |
In: Goldschmidt 2023 Conference |
op_relation |
https://dipot.ulb.ac.be/dspace/bitstream/2013/359209/3/20222 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359209 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1775346797389021184 |