Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model
Antarctic ice cores are invaluable, direct and high-resolution archives of the past atmosphere and the evolution of Earth’s climate. These unique deposits have revealed tight interplays between dust and climate in Southern Hemisphere. We developed an algorithm (complemented with Monte Carlo simulati...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/359207 2023-08-27T04:06:03+02:00 Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model Boxho, Sibylle Mattielli, Nadine Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Gabrielli, Paolo Gili, Stefania Bonneville, Steeve Goldschmidt 2023 Conference (July 2023: Lyon) 2023-06 2 full-text file(s): application/octet-stream | application/octet-stream http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359207 https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/3/17920 https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/4/17920 en eng https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/3/17920 https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/4/17920 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359207 2 full-text file(s): info:eu-repo/semantics/openAccess | info:eu-repo/semantics/openAccess Géochimie Glaciologie info:eu-repo/semantics/conferencePoster info:ulb-repo/semantics/conferencePoster info:ulb-repo/semantics/openurl/document 2023 ftunivbruxelles 2023-08-09T22:23:14Z Antarctic ice cores are invaluable, direct and high-resolution archives of the past atmosphere and the evolution of Earth’s climate. These unique deposits have revealed tight interplays between dust and climate in Southern Hemisphere. We developed an algorithm (complemented with Monte Carlo simulations) using a large database of REE patterns measured in sediments/soils from well-known dust Potential Source Areas (PSAs) located in the Southern Hemisphere to determine respective contributions of these sources that best fit REE patterns measured in ice cores. We applied this methodology to Epica Dome C (EDC)[1] ice core and provide the first continuous, high-resolution record of dust provenance in Antarctica through the Last Glacial-Interglacial Transition (LGIT-2.9 to 33.7kyr BP). Our reconstructed provenance record is consistent with (i) reported isotopic signature of Antarctic dust and (ii) the climatic evolution of the various PSAs contributing to Antarctic depositions. More importantly, our results compare well with our provenance record in Epica Dronning Maud Land (EDML)[2]. Both cores show a major shift in sources between 14 and 15kyr BP when the contribution of Patagonia (main supplier of dust) fell from ̴55% and ̴70% to 35% and ̴50% in EDC and EDML, respectively. After 14kyr BP, dust from Southern Africa (and to a less extent Australia and New Zealand) became more prevalent from ̴20% and ̴8% to ̴35% and ̴23% in EDC and EDML, respectively. Intriguingly, this compositional shift occurs later than the decline in total dust flux observed between 16-18kyr BP in EDC and EDML. We ascribe this 14-15kyr BP shift in the relative contribution of dust from Patagonia and Southern Africa to (i) long-lasting changes in the hydrology of Patagonian rivers and (ii) a sudden acceleration of sea-level rise at 14.5kyr BP that submerged vast swathes of Patagonian continental shelf, triggering a decline in the supply of Patagonian dust to Antarctica and thus, letting the South African dust contribution to emerge. Overall, our ... Conference Object Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica EPICA ice core DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic Dronning Maud Land East Antarctica New Zealand Patagonia |
institution |
Open Polar |
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DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géochimie Glaciologie |
spellingShingle |
Géochimie Glaciologie Boxho, Sibylle Mattielli, Nadine Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Gabrielli, Paolo Gili, Stefania Bonneville, Steeve Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model |
topic_facet |
Géochimie Glaciologie |
description |
Antarctic ice cores are invaluable, direct and high-resolution archives of the past atmosphere and the evolution of Earth’s climate. These unique deposits have revealed tight interplays between dust and climate in Southern Hemisphere. We developed an algorithm (complemented with Monte Carlo simulations) using a large database of REE patterns measured in sediments/soils from well-known dust Potential Source Areas (PSAs) located in the Southern Hemisphere to determine respective contributions of these sources that best fit REE patterns measured in ice cores. We applied this methodology to Epica Dome C (EDC)[1] ice core and provide the first continuous, high-resolution record of dust provenance in Antarctica through the Last Glacial-Interglacial Transition (LGIT-2.9 to 33.7kyr BP). Our reconstructed provenance record is consistent with (i) reported isotopic signature of Antarctic dust and (ii) the climatic evolution of the various PSAs contributing to Antarctic depositions. More importantly, our results compare well with our provenance record in Epica Dronning Maud Land (EDML)[2]. Both cores show a major shift in sources between 14 and 15kyr BP when the contribution of Patagonia (main supplier of dust) fell from ̴55% and ̴70% to 35% and ̴50% in EDC and EDML, respectively. After 14kyr BP, dust from Southern Africa (and to a less extent Australia and New Zealand) became more prevalent from ̴20% and ̴8% to ̴35% and ̴23% in EDC and EDML, respectively. Intriguingly, this compositional shift occurs later than the decline in total dust flux observed between 16-18kyr BP in EDC and EDML. We ascribe this 14-15kyr BP shift in the relative contribution of dust from Patagonia and Southern Africa to (i) long-lasting changes in the hydrology of Patagonian rivers and (ii) a sudden acceleration of sea-level rise at 14.5kyr BP that submerged vast swathes of Patagonian continental shelf, triggering a decline in the supply of Patagonian dust to Antarctica and thus, letting the South African dust contribution to emerge. Overall, our ... |
author2 |
Goldschmidt 2023 Conference (July 2023: Lyon) |
format |
Conference Object |
author |
Boxho, Sibylle Mattielli, Nadine Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Gabrielli, Paolo Gili, Stefania Bonneville, Steeve |
author_facet |
Boxho, Sibylle Mattielli, Nadine Vanderstraeten, Aubry Laruelle, Goulven Gildas Bory, Aloys Gabrielli, Paolo Gili, Stefania Bonneville, Steeve |
author_sort |
Boxho, Sibylle |
title |
Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model |
title_short |
Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model |
title_full |
Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model |
title_fullStr |
Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model |
title_full_unstemmed |
Reading dust provenance in Epica Dome C ice core (East Antarctica): high-resolution, quantitative records from a new Rare Earth Elements (REE) mixing model |
title_sort |
reading dust provenance in epica dome c ice core (east antarctica): high-resolution, quantitative records from a new rare earth elements (ree) mixing model |
publishDate |
2023 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359207 https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/3/17920 https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/4/17920 |
geographic |
Antarctic Dronning Maud Land East Antarctica New Zealand Patagonia |
geographic_facet |
Antarctic Dronning Maud Land East Antarctica New Zealand Patagonia |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica EPICA ice core |
op_relation |
https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/3/17920 https://dipot.ulb.ac.be/dspace/bitstream/2013/359207/4/17920 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/359207 |
op_rights |
2 full-text file(s): info:eu-repo/semantics/openAccess | info:eu-repo/semantics/openAccess |
_version_ |
1775346797553647616 |