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Ice thinning on nunataks during the glacial to interglacial transition in the Antarctic Peninsula region according to Cosmic-Ray Exposure dating: evidence and uncertainties

2021Artigo científico Acesso aberto
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dc.contributor.authorFernández-Fernández, Jose M.
dc.contributor.authorOliva, Marc
dc.contributor.authorPalacios, David
dc.contributor.authorGarcia-Oteyza, Julia
dc.contributor.authorNavarro, Francisco J.
dc.contributor.authorSchimmelpfennig, Irene
dc.contributor.authorLéanni, Laëtitia
dc.contributor.authorTeam, ASTER
dc.date.accessioned2021-07-14T11:32:50Z
dc.date.available2021-07-14T11:32:50Z
dc.date.issued2021
dc.description.abstractThe small ice caps distributed across the Antarctic Peninsula region have undergone large ice volume changes since the Last Glacial Cycle, in line with most of the Antarctic continent. While the surface extent of glacial shrinking is relatively well known, the timing of glacial oscillations and the magnitude of ice thinning remain little investigated. Cosmic-Ray Exposure (CRE) dating applied on ice-free vertical sequences can provide insights about the temporal framework of glacial oscillations. However, the potential occurrence of nuclide inheritance may overestimate the real timing of the last glacial retreat. This problem has been observed in many areas in Continental Antarctica, but similar studies have not yet been conducted in environments of the Maritime Antarctica, such as the South Shetland Islands (SSI). This research focuses on the Hurd Peninsula ice cap (HPIC, ca. 60 220 W, 62 40’ S), located in the SW of Livingston Island, SSI. Past climate oscillations since the Last Glacial Cycle have determined the amount of ice stored in the ice cap. Today, this polythermal ice cap is surrounded by several nunataks standing out above the ice. Three of them have been selected to explore their deglaciation history and to test the potential occurrence of nuclide inheritance in deglaciated bedrocks associated with polythermal glaciers. We present a new dataset with 10 10Be exposure dates. Some of them were found to be anomalously old, evidencing that nuclide inheritance is present in bedrocks associated with polythermal ice caps and suggesting complex glacial exposure histories.We attribute this to limited erosion, given the gentle slope of the nunatak margins and the cold-based character of the surrounding ice. The remaining samples allowed to approach local surface-elevation changes of the HPIC. Our results suggest that ice thinning started during the Last Glacial Maximum (LGM) at ~22 ka but intense glacial shrinking occurred from ~18 to ~13 ka, when the nunataks became exposed, being particularly intense at the end of this period (~14 e13 ka) coinciding with the time of the meltwater pulse 1a (MWP-1a) and the end of the Antarctic Cold Reversal (ACR).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFernández-Fernández, J. M., Oliva, M., Palacios, D. Garcia-Oteyza, J., . . . & ASTER Team (2021). Ice thinning on nunataks during the glacial to interglacial transition in the Antarctic Peninsula region according to Cosmic-Ray Exposure dating: evidence and uncertainties. Quaternary Science Reviews, 264, 107029. https://doi.org/10.1016/j.quascirev.2021.107029pt_PT
dc.identifier.doi10.1016/j.quascirev.2021.107029pt_PT
dc.identifier.issn0277-3791
dc.identifier.urihttp://hdl.handle.net/10451/48924
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationNUNANTAR (02/ SAICT/2017e32002)pt_PT
dc.relationCollege on Polar and Extreme Environments (Polar2E)pt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0277379121002365?via%3Dihubpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectAntarcticapt_PT
dc.subjectSouth Shetland Islandspt_PT
dc.subjectHurd Peninsula ice cappt_PT
dc.subjectNunatakspt_PT
dc.subjectIce thinningpt_PT
dc.subjectNuclide inheritancept_PT
dc.titleIce thinning on nunataks during the glacial to interglacial transition in the Antarctic Peninsula region according to Cosmic-Ray Exposure dating: evidence and uncertaintiespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage107029pt_PT
oaire.citation.titleQuaternary Science Reviewspt_PT
oaire.citation.volume264pt_PT
person.familyNameFernández-Fernández
person.familyNameOliva
person.givenNameJose M.
person.givenNameMarc
person.identifier.ciencia-id5510-AC71-085A
person.identifier.orcid0000-0002-6948-1530
person.identifier.orcid0000-0001-6521-6388
person.identifier.ridK-5423-2014
person.identifier.scopus-author-id35225198700
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationb9a62c34-99a3-4c71-ae9e-cd42eb059393
relation.isAuthorOfPublicationd416bf65-77f6-488e-b275-5fbb257df6d4
relation.isAuthorOfPublication.latestForDiscoveryb9a62c34-99a3-4c71-ae9e-cd42eb059393

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