Mid-Holocene intensification of Southern Hemisphere westerly winds and implications for regional climate dynamics

Tamhane, J; Thomas, ZA; Cadd, H; Harris, MRP; Turney, C; Marjo, CE; Wang, H; Akter, R; Panaretos, P; Halim, A; Gadd, PS; Carter, S; Brickle, P

Mid-Holocene intensification of Southern Hemisphere westerly winds and implications for regional climate dynamics

Tamhane, J Thomas, ZA Cadd, H Harris, MRP Turney, C

Marjo, CE Wang, H Akter, R Panaretos, P Halim, A Gadd, PS Carter, S Brickle, P

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Quaternary Science Reviews, 2023, 305, pp. 108007
Issue Date:: 2023-04-01

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Field	Value	Language
dc.contributor.author	Tamhane, J
dc.contributor.author	Thomas, ZA
dc.contributor.author	Cadd, H
dc.contributor.author	Harris, MRP
dc.contributor.author	Turney, C https://orcid.org/0000-0001-6733-0993
dc.contributor.author	Marjo, CE
dc.contributor.author	Wang, H
dc.contributor.author	Akter, R
dc.contributor.author	Panaretos, P
dc.contributor.author	Halim, A
dc.contributor.author	Gadd, PS
dc.contributor.author	Carter, S
dc.contributor.author	Brickle, P
dc.date.accessioned	2024-05-16T20:09:04Z
dc.date.available	2024-05-16T20:09:04Z
dc.date.issued	2023-04-01
dc.identifier.citation	Quaternary Science Reviews, 2023, 305, pp. 108007
dc.identifier.issn	0277-3791
dc.identifier.uri	http://hdl.handle.net/10453/178997
dc.description.abstract	The Southern Hemisphere westerly winds (SWW), a belt of strong zonal winds in the mid-latitudes, play a key role in Southern Hemisphere climate variability. Recent intensification and southwards migration of the SWW is projected to continue due to anthropogenic climate change and despite a recovering Antarctic ozone hole, impacting regional hydroclimate, ocean circulation and carbon cycling. Despite the importance of the SWW, our understanding of their behaviour on centennial to millennial timescales is limited by the inherently short observational record and limited palaeo-archive agreement on the wind belt's Holocene dynamics. Here we utilise dust flux, Itrax core scanning, rare earth element composition and HYSPLIT particle modelling to present a 8700-year (10,500–1700 cal yr BP) reconstruction of local SWW intensity from a Falkland Islands (Islas Malvinas) peat sediment core which, along with other reconstructions, we interpret in a regional South Atlantic and hemispheric context. We find increased dust deposition and variability from ca. 5700 cal yr BP, signalling an intensification and possible southwards shift of the SWW, though Patagonia likely remains the primary distal dust source throughout our record. Additionally, we identify asymmetric behaviour in the SWW belt from 3000 to 1700 cal yr BP over southern South America and the southwest Atlantic. In alignment with these findings, we propose a possible eastwards projection of the Amundsen Sea Low (ASL) into the South Atlantic during this period. Two volcanic eruptions, likely from Mt Burney (ca. 9700 cal yr BP) and Mt Hudson (ca. 4100 cal yr BP), are captured as cryptotephra deposits in the record. Our precisely dated, high-resolution multiproxy record of South Atlantic wind-blown transport provides an important new dataset that accurately constrains SWW Holocene variability over the Falkland Islands.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Quaternary Science Reviews
dc.relation.isbasedon	10.1016/j.quascirev.2023.108007
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	04 Earth Sciences, 21 History and Archaeology
dc.subject.classification	Paleontology
dc.subject.classification	37 Earth sciences
dc.subject.classification	43 History, heritage and archaeology
dc.title	Mid-Holocene intensification of Southern Hemisphere westerly winds and implications for regional climate dynamics
dc.type	Journal Article
utslib.citation.volume	305
utslib.for	04 Earth Sciences
utslib.for	21 History and Archaeology
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/DVC (Research)
utslib.copyright.status	open_access	*
dc.date.updated	2024-05-16T20:09:02Z
pubs.publication-status	Published
pubs.volume	305

Abstract:

The Southern Hemisphere westerly winds (SWW), a belt of strong zonal winds in the mid-latitudes, play a key role in Southern Hemisphere climate variability. Recent intensification and southwards migration of the SWW is projected to continue due to anthropogenic climate change and despite a recovering Antarctic ozone hole, impacting regional hydroclimate, ocean circulation and carbon cycling. Despite the importance of the SWW, our understanding of their behaviour on centennial to millennial timescales is limited by the inherently short observational record and limited palaeo-archive agreement on the wind belt's Holocene dynamics. Here we utilise dust flux, Itrax core scanning, rare earth element composition and HYSPLIT particle modelling to present a 8700-year (10,500–1700 cal yr BP) reconstruction of local SWW intensity from a Falkland Islands (Islas Malvinas) peat sediment core which, along with other reconstructions, we interpret in a regional South Atlantic and hemispheric context. We find increased dust deposition and variability from ca. 5700 cal yr BP, signalling an intensification and possible southwards shift of the SWW, though Patagonia likely remains the primary distal dust source throughout our record. Additionally, we identify asymmetric behaviour in the SWW belt from 3000 to 1700 cal yr BP over southern South America and the southwest Atlantic. In alignment with these findings, we propose a possible eastwards projection of the Amundsen Sea Low (ASL) into the South Atlantic during this period. Two volcanic eruptions, likely from Mt Burney (ca. 9700 cal yr BP) and Mt Hudson (ca. 4100 cal yr BP), are captured as cryptotephra deposits in the record. Our precisely dated, high-resolution multiproxy record of South Atlantic wind-blown transport provides an important new dataset that accurately constrains SWW Holocene variability over the Falkland Islands.

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http://hdl.handle.net/10453/178997