The last two glacial cycles in central Patagonia: A precise record from the Nirehuao glacier lobe

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dc.contributor.authorPeltier, Carly
dc.contributor.authorKaplan, Michael R.
dc.contributor.authorSagredo, Esteban A.
dc.contributor.authorMoreno, Patricio I.
dc.contributor.authorAraos, Jose
dc.contributor.authorBirkel, Sean D.
dc.contributor.authorVilla-Martinez, Rodrigo
dc.contributor.authorSchwartz, Roseanne
dc.contributor.authorReynhout, Scott A.
dc.contributor.authorSchaefer, Joerg M.
dc.date.accessioned2025-01-20T20:13:41Z
dc.date.available2025-01-20T20:13:41Z
dc.date.issued2023
dc.description.abstractMilankovitch orbital parameters control cycles of insolation, a primary pacer of long term changes in climate, but exactly how insolation signals are transmitted around the globe in the climate system is unclear. In order to address the fundamental questions of when and how ice age climates begin and end, how fast glaciers retreated during the last deglaciation, and how glaciers behaved before anthropogenic influence, we need robust glacial chronologies. The timing of local glacial maxima beyond the last glacial cycle, however, has remained largely unconstrained due to moraine degradation over time, limiting our ability to fully explore these questions. By developing a detailed geomorphic surficial map and targeting relatively tall, ridge-top boulders, we have constructed a new, precise 10Be chronology of glacial maxima of the Nirehuao glacier lobe (45 degrees S) for the last two glacial cycles. We report one of the first directly dated records of a MIS 6 glacier advance in Patagonia, which formed a major set of moraines by at least 153 +/- 5.1 ka, with a stillstand or smaller readvance by 137 +/- 4.2 ka, corresponding to the two coldest and dustiest periods of MIS 6 in Antarctica. The next largest advance occurred at 23.6 +/- 0.9 ka, at the end of peak Southern Hemisphere MIS 2 cooling. Retreat of the glacier commenced by similar to 18.5 cal ka BP when lakes in a tributary valley just to the southwest became ice-free. Overall we find that advances of the Nirehuao glacier lobe occur when winter sea ice around Antarctica is expansive and both obliquity and eccentricity are at their minima. (c) 2022 Published by Elsevier Ltd.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.quascirev.2022.107873
dc.identifier.eissn1873-457X
dc.identifier.issn0277-3791
dc.identifier.urihttps://doi.org/10.1016/j.quascirev.2022.107873
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/92158
dc.identifier.wosidWOS:000992807400001
dc.language.isoen
dc.revistaQuaternary science reviews
dc.rightsacceso restringido
dc.subjectQuaternary
dc.subjectGlaciation
dc.subjectPaleoclimatology
dc.subjectSouth America
dc.subjectPaleo ice sheet modeling
dc.subjectPatagonia
dc.subjectMIS 6
dc.subjectMIS 2
dc.subjectGlacial geomorphology
dc.subjectBe-10 exposure Dating
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleThe last two glacial cycles in central Patagonia: A precise record from the Nirehuao glacier lobe
dc.typeartículo
dc.volumen304
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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