Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust

Autores
Gili, Stefania; Gaiero, Diego Marcelo; Goldstein, Steven L.; Chemale, Farid; Jweda, Jason; Kaplan, Michael R.; Becchio, Raul Alberto; Koester, Edinei
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The latitudinal displacement of the southern westerlies and associated climate systems is a key parameter for understanding the variations of Southern Hemisphere atmospheric circulation during the Late Quaternary Period. To increase understanding of past atmospheric circulation and of the paleo-environmental conditions associated with continental dust sources, we dig deeper into dust provenance in paleo-archives of the Southern Hemisphere. We present here a Sr?Nd isotopic and rare earth element study of surface sediments collected along a ∼4000 km latitudinal band from arid and semi-arid terrains in southern South America. Findings from terrains that served as paleo-dust suppliers are compared with modern dust collected from monitoring stations along the same latitudinal band, which affords a test on how actual present-day aeolian compositions compare to those of the past potential source areas. Moreover, the comparison between past and present-day datasets is useful for understanding present-day atmospheric circulation. Armed with a new comprehensive dataset, we revise previous interpretations of the provenance of dust trapped in the Antarctic ice and sediments deposited in the South Atlantic sector of the Southern Ocean. These comparisons support multiple source regions in southern South America that changed with climates. The findings reveal that, although Patagonia plays an important role in contributing dust to the higher latitudes, central Western Argentina and (to a lesser extent) the southern Puna region also emerge as potentially important dust sources during glacial times. The southern Altiplano appears to be a major contributor during interglacial periods as well. We rely in part on an understanding of modern wind?dust activities to conclude that the possible presence of southern South America source regions ? other than Patagonia ? in East Antarctic ice is consistent with an overall equatorward displacement during glacial times of both the mid-latitude westerlies and the subtropical jet stream.
Fil: Gili, Stefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Gaiero, Diego Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Goldstein, Steven L.. Columbia University; Estados Unidos
Fil: Chemale, Farid. Universidade do Vale do Rio dos Sinos; Brasil
Fil: Jweda, Jason. Columbia University; Estados Unidos
Fil: Kaplan, Michael R.. Columbia University; Estados Unidos
Fil: Becchio, Raul Alberto. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Koester, Edinei. Universidade Federal do Rio Grande do Sul; Brasil
Materia
Antarctica
Dust
Radiogenic Isotopes
Ree
South America
Southern Westerly Winds
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/40902
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/40902
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dustGili, StefaniaGaiero, Diego MarceloGoldstein, Steven L.Chemale, FaridJweda, JasonKaplan, Michael R.Becchio, Raul AlbertoKoester, EdineiAntarcticaDustRadiogenic IsotopesReeSouth AmericaSouthern Westerly Windshttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The latitudinal displacement of the southern westerlies and associated climate systems is a key parameter for understanding the variations of Southern Hemisphere atmospheric circulation during the Late Quaternary Period. To increase understanding of past atmospheric circulation and of the paleo-environmental conditions associated with continental dust sources, we dig deeper into dust provenance in paleo-archives of the Southern Hemisphere. We present here a Sr?Nd isotopic and rare earth element study of surface sediments collected along a ∼4000 km latitudinal band from arid and semi-arid terrains in southern South America. Findings from terrains that served as paleo-dust suppliers are compared with modern dust collected from monitoring stations along the same latitudinal band, which affords a test on how actual present-day aeolian compositions compare to those of the past potential source areas. Moreover, the comparison between past and present-day datasets is useful for understanding present-day atmospheric circulation. Armed with a new comprehensive dataset, we revise previous interpretations of the provenance of dust trapped in the Antarctic ice and sediments deposited in the South Atlantic sector of the Southern Ocean. These comparisons support multiple source regions in southern South America that changed with climates. The findings reveal that, although Patagonia plays an important role in contributing dust to the higher latitudes, central Western Argentina and (to a lesser extent) the southern Puna region also emerge as potentially important dust sources during glacial times. The southern Altiplano appears to be a major contributor during interglacial periods as well. We rely in part on an understanding of modern wind?dust activities to conclude that the possible presence of southern South America source regions ? other than Patagonia ? in East Antarctic ice is consistent with an overall equatorward displacement during glacial times of both the mid-latitude westerlies and the subtropical jet stream.Fil: Gili, Stefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaFil: Gaiero, Diego Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaFil: Goldstein, Steven L.. Columbia University; Estados UnidosFil: Chemale, Farid. Universidade do Vale do Rio dos Sinos; BrasilFil: Jweda, Jason. Columbia University; Estados UnidosFil: Kaplan, Michael R.. Columbia University; Estados UnidosFil: Becchio, Raul Alberto. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Koester, Edinei. Universidade Federal do Rio Grande do Sul; BrasilElsevier Science2017-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/40902Gili, Stefania; Gaiero, Diego Marcelo; Goldstein, Steven L.; Chemale, Farid; Jweda, Jason; et al.; Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust; Elsevier Science; Earth and Planetary Science Letters; 469; 7-2017; 98-1090012-821XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2017.04.007info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0012821X17301863info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:24:43Zoai:ri.conicet.gov.ar:11336/40902instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:24:43.712CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
title Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
spellingShingle Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
Gili, Stefania
Antarctica
Dust
Radiogenic Isotopes
Ree
South America
Southern Westerly Winds
title_short Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
title_full Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
title_fullStr Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
title_full_unstemmed Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
title_sort Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust
dc.creator.none.fl_str_mv Gili, Stefania
Gaiero, Diego Marcelo
Goldstein, Steven L.
Chemale, Farid
Jweda, Jason
Kaplan, Michael R.
Becchio, Raul Alberto
Koester, Edinei
author Gili, Stefania
author_facet Gili, Stefania
Gaiero, Diego Marcelo
Goldstein, Steven L.
Chemale, Farid
Jweda, Jason
Kaplan, Michael R.
Becchio, Raul Alberto
Koester, Edinei
author_role author
author2 Gaiero, Diego Marcelo
Goldstein, Steven L.
Chemale, Farid
Jweda, Jason
Kaplan, Michael R.
Becchio, Raul Alberto
Koester, Edinei
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Antarctica
Dust
Radiogenic Isotopes
Ree
South America
Southern Westerly Winds
topic Antarctica
Dust
Radiogenic Isotopes
Ree
South America
Southern Westerly Winds
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The latitudinal displacement of the southern westerlies and associated climate systems is a key parameter for understanding the variations of Southern Hemisphere atmospheric circulation during the Late Quaternary Period. To increase understanding of past atmospheric circulation and of the paleo-environmental conditions associated with continental dust sources, we dig deeper into dust provenance in paleo-archives of the Southern Hemisphere. We present here a Sr?Nd isotopic and rare earth element study of surface sediments collected along a ∼4000 km latitudinal band from arid and semi-arid terrains in southern South America. Findings from terrains that served as paleo-dust suppliers are compared with modern dust collected from monitoring stations along the same latitudinal band, which affords a test on how actual present-day aeolian compositions compare to those of the past potential source areas. Moreover, the comparison between past and present-day datasets is useful for understanding present-day atmospheric circulation. Armed with a new comprehensive dataset, we revise previous interpretations of the provenance of dust trapped in the Antarctic ice and sediments deposited in the South Atlantic sector of the Southern Ocean. These comparisons support multiple source regions in southern South America that changed with climates. The findings reveal that, although Patagonia plays an important role in contributing dust to the higher latitudes, central Western Argentina and (to a lesser extent) the southern Puna region also emerge as potentially important dust sources during glacial times. The southern Altiplano appears to be a major contributor during interglacial periods as well. We rely in part on an understanding of modern wind?dust activities to conclude that the possible presence of southern South America source regions ? other than Patagonia ? in East Antarctic ice is consistent with an overall equatorward displacement during glacial times of both the mid-latitude westerlies and the subtropical jet stream.
Fil: Gili, Stefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Gaiero, Diego Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Goldstein, Steven L.. Columbia University; Estados Unidos
Fil: Chemale, Farid. Universidade do Vale do Rio dos Sinos; Brasil
Fil: Jweda, Jason. Columbia University; Estados Unidos
Fil: Kaplan, Michael R.. Columbia University; Estados Unidos
Fil: Becchio, Raul Alberto. Universidad Nacional de Salta; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Koester, Edinei. Universidade Federal do Rio Grande do Sul; Brasil
description The latitudinal displacement of the southern westerlies and associated climate systems is a key parameter for understanding the variations of Southern Hemisphere atmospheric circulation during the Late Quaternary Period. To increase understanding of past atmospheric circulation and of the paleo-environmental conditions associated with continental dust sources, we dig deeper into dust provenance in paleo-archives of the Southern Hemisphere. We present here a Sr?Nd isotopic and rare earth element study of surface sediments collected along a ∼4000 km latitudinal band from arid and semi-arid terrains in southern South America. Findings from terrains that served as paleo-dust suppliers are compared with modern dust collected from monitoring stations along the same latitudinal band, which affords a test on how actual present-day aeolian compositions compare to those of the past potential source areas. Moreover, the comparison between past and present-day datasets is useful for understanding present-day atmospheric circulation. Armed with a new comprehensive dataset, we revise previous interpretations of the provenance of dust trapped in the Antarctic ice and sediments deposited in the South Atlantic sector of the Southern Ocean. These comparisons support multiple source regions in southern South America that changed with climates. The findings reveal that, although Patagonia plays an important role in contributing dust to the higher latitudes, central Western Argentina and (to a lesser extent) the southern Puna region also emerge as potentially important dust sources during glacial times. The southern Altiplano appears to be a major contributor during interglacial periods as well. We rely in part on an understanding of modern wind?dust activities to conclude that the possible presence of southern South America source regions ? other than Patagonia ? in East Antarctic ice is consistent with an overall equatorward displacement during glacial times of both the mid-latitude westerlies and the subtropical jet stream.
publishDate 2017
dc.date.none.fl_str_mv 2017-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/40902
Gili, Stefania; Gaiero, Diego Marcelo; Goldstein, Steven L.; Chemale, Farid; Jweda, Jason; et al.; Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust; Elsevier Science; Earth and Planetary Science Letters; 469; 7-2017; 98-109
0012-821X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/40902
identifier_str_mv Gili, Stefania; Gaiero, Diego Marcelo; Goldstein, Steven L.; Chemale, Farid; Jweda, Jason; et al.; Glacial/interglacial changes of Southern Hemisphere wind circulation from the geochemistry of South American dust; Elsevier Science; Earth and Planetary Science Letters; 469; 7-2017; 98-109
0012-821X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2017.04.007
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0012821X17301863
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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