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dc.contributor.author
Villacís, L. A.
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Moreno, P. I.
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Vilanova, Isabel
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Henríquez, C. A.
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Henríquez, W. I.
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Villa Martínez, R. P.
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Sepúlveda Zúñiga, E. A.
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Maidana, Nora Irene
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dc.date.available
2023-11-29T19:27:24Z
dc.date.issued
2023-02
dc.identifier.citation
Villacís, L. A.; Moreno, P. I.; Vilanova, Isabel; Henríquez, C. A.; Henríquez, W. I.; et al.; A freshwater diatom perspective on the evolution of the southern westerlies for the past ∼14,000 years in southwestern Patagonia; Pergamon-Elsevier Science Ltd; Quaternary Science Reviews; 301; 2-2023; 1-19
dc.identifier.issn
0277-3791
dc.identifier.uri
http://hdl.handle.net/11336/218850
dc.description.abstract
Conflicting, even opposite interpretations on the evolution of the Southern Westerly Winds (SWW) are evident in paleoenvironmental records from southwestern Patagonia since the last ice age. These divergences call for new approaches utilizing different, ideally independent indicators of paleoenvironmental/paleoclimatic change from sensitive sites in climatically relevant locations. Here we present a multidecadally resolved diatom record from Lago Cipreses (51°S), a small closed-basin lake located in a bedrock depression along the eastern foothills of the southern Patagonian Andes. The hydrological balance evolution of this isolated lake affords a direct tie with SWW intensity in a mountainous sector where zonal wind strength and local precipitation are highly correlated. We detect cold-tolerant diatoms (small fragilarioids) between ∼14-11.9 cal. ka BP followed by a shift to planktonic assemblages (Discostella pseudostelligera, Aulacoseira spp.) under warmer Holocene conditions. Diatom assemblages indicative of stratified water-column conditions (Discostella pseudostelligera, Achnanthidium aff tepidaricola, Achnanthidium sieminskae) reached their maximum stability between ∼9.1-7.4 cal. ka BP. Stronger water-column mixing is evident by an abrupt species turnover to Aulacoseira spp. between ∼7.4-3.1 cal. ka BP, superimposed on centennial-scale alternations between assemblages since ∼6.1 cal. ka BP. Cold-tolerant diatoms resurge at ∼3.1 cal. ka BP and persist until the present. Our record offers assemblage-based evidence we interpret as sub-centennial to multimillennial scale changes in hydroclimate indicative of: (i) strong SWW influence between ∼14-11.9 cal. ka BP, (ii) a transition between ∼11.9-11.3 cal. ka BP to weak SWW influence between ∼11.3-6.5 cal. ka BP, with a SWW minimum between ∼9.1-7.4 cal. ka BP, and (iii) strong SWW influence since ∼6.5 cal. ka BP, with a Holocene SWW maximum since ∼3.1 cal. ka BP. We posit that enhanced hydroclimate variability since ∼6.1 cal. ka BP attests to the onset of Southern Annular Mode-like changes at centennial-to sub-centennial timescales. We detect a remarkably coherent and synchronous response of terrestrial and aquatic ecosystems at local scale since ∼14 cal. ka BP, highlighting the overriding importance of variations in SWW influence in terrestrial and aquatic environments at multiple timescales.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
HOLOCENE
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HYDROCLIMATE VARIABILITY
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PALEOLIMNOLOGY
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SOUTHERN ANNULAR MODE
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SOUTHERN WESTERLY WINDS
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SOUTHWESTERN PATAGONIA
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Otras Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
A freshwater diatom perspective on the evolution of the southern westerlies for the past ∼14,000 years in southwestern Patagonia
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-11-28T15:05:04Z
dc.journal.volume
301
dc.journal.pagination
1-19
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Villacís, L. A.. Universidad de Chile; Chile
dc.description.fil
Fil: Moreno, P. I.. Universidad de Chile; Chile
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Fil: Vilanova, Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
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Fil: Henríquez, C. A.. Universidad de Chile; Chile
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Fil: Henríquez, W. I.. University of Melbourne; Australia
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Fil: Villa Martínez, R. P.. Universidad de Magallanes; Chile
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Fil: Sepúlveda Zúñiga, E. A.. Pontificia Universidad Católica de Chile; Chile
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Fil: Maidana, Nora Irene. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentina
dc.journal.title
Quaternary Science Reviews
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0277379122005601
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.quascirev.2022.107929
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