Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage

Autores
Ivany, Linda C.; del Río, Claudia Julia; Alvarez, Maximiliano Jorge; Acosta, R. Paul; Lohmann, Kyger C.; Raigemborn, María Sol
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Miocene Epoch (23.03–5.33 Ma) is receiving increased attention because estimated pCO2 andits associated warmth is comparable to projections over the next century. Well‐constrained sea‐surface temperatures in the tropics and northern latitudes express amplified warming during the Miocene Climatic Optimum (MCO; 16.9–14.7 Ma), yet data from the Southern hemisphere are few, especially in the mid‐high south Atlantic, and proxies appear to suggest only moderate warming. Here, we present seasonally resolved oxygen isotope data from fossil marine bivalves in the Early Miocene (Burdigalian) Monte León Formation of southern Patagonia, Argentina, and explore their implications for Miocene paleoclimate. Paleoclimate simulations from the Miocene isotope enabled Earth System Model (iCESM1.2) allow for proxy‐model comparison. Mean annual paleotemperatures increase from∼15°C to ∼20°C between ∼19.3–17.5 Ma, consistent with model predictions at400 and 560 ppm CO2, respectively. Using a recently reported isotopically positive ocean, calculatedpaleotemperatures are 4°C warmer still, more akin to the warmth documented in the early‐mid Miocene northern hemisphere. Both reinforce mid‐high‐latitude warmth in the approach to the MCO, but the second well exceeds model‐predicted temperatures, even at higher pCO2. Seasonal range increases upsection from∼3.5°C to ∼6.4°C, with more warming in the summer, potentially reflecting an increase in the influence of a seasonally oscillating Malvinas current on the Patagonian coast associated with an increasingly open Drake Passage. The fact that paleoSSTs are substantially warmer than those in the study area today (6–10°C), despite only moderately elevatedestimated pCO2, merits further attention.
Fil: Ivany, Linda C.. Syracuse University; Estados Unidos
Fil: del Río, Claudia Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Alvarez, Maximiliano Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Acosta, R. Paul. George Mason University; Estados Unidos
Fil: Lohmann, Kyger C.. University of Michigan; Estados Unidos
Fil: Raigemborn, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
Materia
MIOCENE
PALEOTEMPERATURES
PATAGONIA
ARGENTINA
ISOTOPOS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/272306
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/272306
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake PassageIvany, Linda C.del Río, Claudia JuliaAlvarez, Maximiliano JorgeAcosta, R. PaulLohmann, Kyger C.Raigemborn, María SolMIOCENEPALEOTEMPERATURESPATAGONIAARGENTINAISOTOPOShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Miocene Epoch (23.03–5.33 Ma) is receiving increased attention because estimated pCO2 andits associated warmth is comparable to projections over the next century. Well‐constrained sea‐surface temperatures in the tropics and northern latitudes express amplified warming during the Miocene Climatic Optimum (MCO; 16.9–14.7 Ma), yet data from the Southern hemisphere are few, especially in the mid‐high south Atlantic, and proxies appear to suggest only moderate warming. Here, we present seasonally resolved oxygen isotope data from fossil marine bivalves in the Early Miocene (Burdigalian) Monte León Formation of southern Patagonia, Argentina, and explore their implications for Miocene paleoclimate. Paleoclimate simulations from the Miocene isotope enabled Earth System Model (iCESM1.2) allow for proxy‐model comparison. Mean annual paleotemperatures increase from∼15°C to ∼20°C between ∼19.3–17.5 Ma, consistent with model predictions at400 and 560 ppm CO2, respectively. Using a recently reported isotopically positive ocean, calculatedpaleotemperatures are 4°C warmer still, more akin to the warmth documented in the early‐mid Miocene northern hemisphere. Both reinforce mid‐high‐latitude warmth in the approach to the MCO, but the second well exceeds model‐predicted temperatures, even at higher pCO2. Seasonal range increases upsection from∼3.5°C to ∼6.4°C, with more warming in the summer, potentially reflecting an increase in the influence of a seasonally oscillating Malvinas current on the Patagonian coast associated with an increasingly open Drake Passage. The fact that paleoSSTs are substantially warmer than those in the study area today (6–10°C), despite only moderately elevatedestimated pCO2, merits further attention.Fil: Ivany, Linda C.. Syracuse University; Estados UnidosFil: del Río, Claudia Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Alvarez, Maximiliano Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Acosta, R. Paul. George Mason University; Estados UnidosFil: Lohmann, Kyger C.. University of Michigan; Estados UnidosFil: Raigemborn, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; ArgentinaAmerican Geophysical Union2025-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/272306Ivany, Linda C.; del Río, Claudia Julia; Alvarez, Maximiliano Jorge; Acosta, R. Paul; Lohmann, Kyger C.; et al.; Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage; American Geophysical Union; Paleoceanography and Paleoclimatology; 40; 6; 5-2025; 1-282572-45172572-4525CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025PA005100info:eu-repo/semantics/altIdentifier/doi/10.1029/2025PA005100info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:49:03Zoai:ri.conicet.gov.ar:11336/272306instacron: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 14:49:04.04CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
title Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
spellingShingle Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
Ivany, Linda C.
MIOCENE
PALEOTEMPERATURES
PATAGONIA
ARGENTINA
ISOTOPOS
title_short Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
title_full Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
title_fullStr Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
title_full_unstemmed Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
title_sort Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage
dc.creator.none.fl_str_mv Ivany, Linda C.
del Río, Claudia Julia
Alvarez, Maximiliano Jorge
Acosta, R. Paul
Lohmann, Kyger C.
Raigemborn, María Sol
author Ivany, Linda C.
author_facet Ivany, Linda C.
del Río, Claudia Julia
Alvarez, Maximiliano Jorge
Acosta, R. Paul
Lohmann, Kyger C.
Raigemborn, María Sol
author_role author
author2 del Río, Claudia Julia
Alvarez, Maximiliano Jorge
Acosta, R. Paul
Lohmann, Kyger C.
Raigemborn, María Sol
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv MIOCENE
PALEOTEMPERATURES
PATAGONIA
ARGENTINA
ISOTOPOS
topic MIOCENE
PALEOTEMPERATURES
PATAGONIA
ARGENTINA
ISOTOPOS
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 Miocene Epoch (23.03–5.33 Ma) is receiving increased attention because estimated pCO2 andits associated warmth is comparable to projections over the next century. Well‐constrained sea‐surface temperatures in the tropics and northern latitudes express amplified warming during the Miocene Climatic Optimum (MCO; 16.9–14.7 Ma), yet data from the Southern hemisphere are few, especially in the mid‐high south Atlantic, and proxies appear to suggest only moderate warming. Here, we present seasonally resolved oxygen isotope data from fossil marine bivalves in the Early Miocene (Burdigalian) Monte León Formation of southern Patagonia, Argentina, and explore their implications for Miocene paleoclimate. Paleoclimate simulations from the Miocene isotope enabled Earth System Model (iCESM1.2) allow for proxy‐model comparison. Mean annual paleotemperatures increase from∼15°C to ∼20°C between ∼19.3–17.5 Ma, consistent with model predictions at400 and 560 ppm CO2, respectively. Using a recently reported isotopically positive ocean, calculatedpaleotemperatures are 4°C warmer still, more akin to the warmth documented in the early‐mid Miocene northern hemisphere. Both reinforce mid‐high‐latitude warmth in the approach to the MCO, but the second well exceeds model‐predicted temperatures, even at higher pCO2. Seasonal range increases upsection from∼3.5°C to ∼6.4°C, with more warming in the summer, potentially reflecting an increase in the influence of a seasonally oscillating Malvinas current on the Patagonian coast associated with an increasingly open Drake Passage. The fact that paleoSSTs are substantially warmer than those in the study area today (6–10°C), despite only moderately elevatedestimated pCO2, merits further attention.
Fil: Ivany, Linda C.. Syracuse University; Estados Unidos
Fil: del Río, Claudia Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Alvarez, Maximiliano Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Acosta, R. Paul. George Mason University; Estados Unidos
Fil: Lohmann, Kyger C.. University of Michigan; Estados Unidos
Fil: Raigemborn, María Sol. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
description The Miocene Epoch (23.03–5.33 Ma) is receiving increased attention because estimated pCO2 andits associated warmth is comparable to projections over the next century. Well‐constrained sea‐surface temperatures in the tropics and northern latitudes express amplified warming during the Miocene Climatic Optimum (MCO; 16.9–14.7 Ma), yet data from the Southern hemisphere are few, especially in the mid‐high south Atlantic, and proxies appear to suggest only moderate warming. Here, we present seasonally resolved oxygen isotope data from fossil marine bivalves in the Early Miocene (Burdigalian) Monte León Formation of southern Patagonia, Argentina, and explore their implications for Miocene paleoclimate. Paleoclimate simulations from the Miocene isotope enabled Earth System Model (iCESM1.2) allow for proxy‐model comparison. Mean annual paleotemperatures increase from∼15°C to ∼20°C between ∼19.3–17.5 Ma, consistent with model predictions at400 and 560 ppm CO2, respectively. Using a recently reported isotopically positive ocean, calculatedpaleotemperatures are 4°C warmer still, more akin to the warmth documented in the early‐mid Miocene northern hemisphere. Both reinforce mid‐high‐latitude warmth in the approach to the MCO, but the second well exceeds model‐predicted temperatures, even at higher pCO2. Seasonal range increases upsection from∼3.5°C to ∼6.4°C, with more warming in the summer, potentially reflecting an increase in the influence of a seasonally oscillating Malvinas current on the Patagonian coast associated with an increasingly open Drake Passage. The fact that paleoSSTs are substantially warmer than those in the study area today (6–10°C), despite only moderately elevatedestimated pCO2, merits further attention.
publishDate 2025
dc.date.none.fl_str_mv 2025-05
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/11336/272306
Ivany, Linda C.; del Río, Claudia Julia; Alvarez, Maximiliano Jorge; Acosta, R. Paul; Lohmann, Kyger C.; et al.; Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage; American Geophysical Union; Paleoceanography and Paleoclimatology; 40; 6; 5-2025; 1-28
2572-4517
2572-4525
CONICET Digital
CONICET
url http://hdl.handle.net/11336/272306
identifier_str_mv Ivany, Linda C.; del Río, Claudia Julia; Alvarez, Maximiliano Jorge; Acosta, R. Paul; Lohmann, Kyger C.; et al.; Approaching the Miocene Climatic Optimum in Patagonia (Southern Argentina): Temperature Seasonality and a Potential Role for the Opening Drake Passage; American Geophysical Union; Paleoceanography and Paleoclimatology; 40; 6; 5-2025; 1-28
2572-4517
2572-4525
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2025PA005100
info:eu-repo/semantics/altIdentifier/doi/10.1029/2025PA005100
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union
publisher.none.fl_str_mv American Geophysical Union
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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