Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago)
A lead (Pb) isotopic record, covering the two oldest glacial–interglacial cycles (~572 to 801 kyr ago) characterized by lukewarm interglacials in the European Project for Ice Coring in Antarctica Dome C ice core, provides evidence for dust provenance in central East Antarctic ice prior to the Mid-Br...
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ftdoajarticles:oai:doaj.org/article:4df2da6492c94161a0597071b4e320a6 2024-01-07T09:39:04+01:00 Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago) Changhee Han Laurie J. Burn Paul Vallelonga Soon Do Hur Claude F. Boutron Yeongcheol Han Sanghee Lee Ahhyung Lee Sungmin Hong 2022-06-01T00:00:00Z https://doi.org/10.3390/molecules27134208 https://doaj.org/article/4df2da6492c94161a0597071b4e320a6 EN eng MDPI AG https://www.mdpi.com/1420-3049/27/13/4208 https://doaj.org/toc/1420-3049 doi:10.3390/molecules27134208 1420-3049 https://doaj.org/article/4df2da6492c94161a0597071b4e320a6 Molecules, Vol 27, Iss 13, p 4208 (2022) lead isotopes EPICA Dome C ice core Mid-Brunhes Event dust and volcanic sources isotope mixing model southern westerly winds Organic chemistry QD241-441 article 2022 ftdoajarticles https://doi.org/10.3390/molecules27134208 2023-12-10T01:43:57Z A lead (Pb) isotopic record, covering the two oldest glacial–interglacial cycles (~572 to 801 kyr ago) characterized by lukewarm interglacials in the European Project for Ice Coring in Antarctica Dome C ice core, provides evidence for dust provenance in central East Antarctic ice prior to the Mid-Brunhes Event (MBE), ~430 kyr ago. Combined with published post-MBE data, distinct isotopic compositions, coupled with isotope mixing model results, suggest Patagonia/Tierra del Fuego (TdF) as the most important sources of dust during both pre-MBE and post-MBE cold and intermediate glacial periods. During interglacials, central-western Argentina emerges as a major contributor, resulting from reduced dust supply from Patagonia/TdF after the MBE, contrasting to the persistent dominance of dust from Patagonia/TdF before the MBE. The data also show a small fraction of volcanic Pb transferred from extra-Antarctic volcanoes during post-MBE interglacials, as opposed to abundant transfer prior to the MBE. These differences are most likely attributed to the enhanced wet removal efficiency with the hydrological cycle intensified over the Southern Ocean, associated with a poleward shift of the southern westerly winds (SWW) during warmer post-MBE interglacials, and vice versa during cooler pre-MBE ones. Our results highlight sensitive responses of the SWW and the associated atmospheric conditions to stepwise Antarctic warming. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Southern Ocean Tierra del Fuego Directory of Open Access Journals: DOAJ Articles Antarctic Argentina Patagonia Southern Ocean Molecules 27 13 4208 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
lead isotopes EPICA Dome C ice core Mid-Brunhes Event dust and volcanic sources isotope mixing model southern westerly winds Organic chemistry QD241-441 |
spellingShingle |
lead isotopes EPICA Dome C ice core Mid-Brunhes Event dust and volcanic sources isotope mixing model southern westerly winds Organic chemistry QD241-441 Changhee Han Laurie J. Burn Paul Vallelonga Soon Do Hur Claude F. Boutron Yeongcheol Han Sanghee Lee Ahhyung Lee Sungmin Hong Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago) |
topic_facet |
lead isotopes EPICA Dome C ice core Mid-Brunhes Event dust and volcanic sources isotope mixing model southern westerly winds Organic chemistry QD241-441 |
description |
A lead (Pb) isotopic record, covering the two oldest glacial–interglacial cycles (~572 to 801 kyr ago) characterized by lukewarm interglacials in the European Project for Ice Coring in Antarctica Dome C ice core, provides evidence for dust provenance in central East Antarctic ice prior to the Mid-Brunhes Event (MBE), ~430 kyr ago. Combined with published post-MBE data, distinct isotopic compositions, coupled with isotope mixing model results, suggest Patagonia/Tierra del Fuego (TdF) as the most important sources of dust during both pre-MBE and post-MBE cold and intermediate glacial periods. During interglacials, central-western Argentina emerges as a major contributor, resulting from reduced dust supply from Patagonia/TdF after the MBE, contrasting to the persistent dominance of dust from Patagonia/TdF before the MBE. The data also show a small fraction of volcanic Pb transferred from extra-Antarctic volcanoes during post-MBE interglacials, as opposed to abundant transfer prior to the MBE. These differences are most likely attributed to the enhanced wet removal efficiency with the hydrological cycle intensified over the Southern Ocean, associated with a poleward shift of the southern westerly winds (SWW) during warmer post-MBE interglacials, and vice versa during cooler pre-MBE ones. Our results highlight sensitive responses of the SWW and the associated atmospheric conditions to stepwise Antarctic warming. |
format |
Article in Journal/Newspaper |
author |
Changhee Han Laurie J. Burn Paul Vallelonga Soon Do Hur Claude F. Boutron Yeongcheol Han Sanghee Lee Ahhyung Lee Sungmin Hong |
author_facet |
Changhee Han Laurie J. Burn Paul Vallelonga Soon Do Hur Claude F. Boutron Yeongcheol Han Sanghee Lee Ahhyung Lee Sungmin Hong |
author_sort |
Changhee Han |
title |
Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago) |
title_short |
Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago) |
title_full |
Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago) |
title_fullStr |
Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago) |
title_full_unstemmed |
Lead Isotopic Constraints on the Provenance of Antarctic Dust and Atmospheric Circulation Patterns Prior to the Mid-Brunhes Event (~430 kyr ago) |
title_sort |
lead isotopic constraints on the provenance of antarctic dust and atmospheric circulation patterns prior to the mid-brunhes event (~430 kyr ago) |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/molecules27134208 https://doaj.org/article/4df2da6492c94161a0597071b4e320a6 |
geographic |
Antarctic Argentina Patagonia Southern Ocean |
geographic_facet |
Antarctic Argentina Patagonia Southern Ocean |
genre |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean Tierra del Fuego |
op_source |
Molecules, Vol 27, Iss 13, p 4208 (2022) |
op_relation |
https://www.mdpi.com/1420-3049/27/13/4208 https://doaj.org/toc/1420-3049 doi:10.3390/molecules27134208 1420-3049 https://doaj.org/article/4df2da6492c94161a0597071b4e320a6 |
op_doi |
https://doi.org/10.3390/molecules27134208 |
container_title |
Molecules |
container_volume |
27 |
container_issue |
13 |
container_start_page |
4208 |
_version_ |
1787428295876280320 |