Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/14124
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dc.date.accessioned2021-01-05T10:33:59Z-
dc.date.available2021-01-05T10:33:59Z-
dc.date.issued2020-03-28-
dc.identifier.urihttp://hdl.handle.net/2122/14124-
dc.description.abstractTime-series analyses of satellite images reveal that sea ice extent in the Ross Sea has experienced significant changes over the last 40 years, likely triggered by large-scale atmospheric anomalies. However, resolving how sea ice in the Ross Sea has changed over longer timeframes has until now remained more elusive. Here we used a laminated sediment piston core (14.6 m) collected from the Edisto inlet (Western Ross Sea) to reconstruct fast ice dynamics over the last 2.6 ka. Our goal was to first understand the climate expression of selected well-defined sediment laminae and then use these characteristics for reconstructing past sea ice behaviour across the whole sedimentary sequence. We used the recently established sea ice diatom biomarker proxy IPSO25 in combination with diatom census counts and bulk analyses. Analyses performed on a suite of discrete laminae revealed statistically significant differences between dark and light laminae reflecting different depositional conditions. Based on their respective biogeochemical fingerprints, we infer that dark laminae accumulated during sea ice thaws in early summer. Under these conditions, laminae contain relatively high concentrations of IPSO25 and display an enriched d13C composition for the bulk organic matter (OM). While diatom assemblages in dark laminae are relatively homogenous, as the thaw continues later in the summer, Corethron pennatum becomes the dominant diatom species, resulting in the formation of light laminae characterized by low IPSO25 concentrations. Since C. pennatum can migrate vertically through the water column to uptake nutrients and avoid competition in oligotrophic waters, its high concentration likely reflects stratified and ice-free surface waters typical of late summer. Down-core trends show that the correlation between sediment brightness and geochemical fingerprint (i.e., IPSO25 and d13C) holds throughout the record. Based on the knowledge gained at lamina level, our down-core high-resolution reconstruction shows that the summer fast ice coverage changed dramatically during the late Holocene. Specifically, we conclude that the Edisto inlet experienced regular early summer opening between 2.6 ka, and ca. 0.7 ka, after which, coastal fast ice persisted during summer months and ice-free conditions became less frequent. Comparison with previous regional ice core data suggests that the sudden cooling recorded over the Victoria Land Coast region since 0.7 ka might potentially explain our observation of persistent summer fast ice in the Western Ross Sea. Our study has shown that multi-proxy data derived from laminated sediments can provide hitherto unknown detail regarding past summer sea ice dynamics in coastal Antarctic regions.en_US
dc.language.isoEnglishen_US
dc.publisher.nameElsevieren_US
dc.relation.ispartofQuaternary Science Reviewsen_US
dc.relation.ispartofseries/237 (2020)en_US
dc.subjectRoss Seaen_US
dc.subjectFast iceen_US
dc.subjectLaminated sedimentsen_US
dc.subjectIPSO25en_US
dc.subjectSea iceen_US
dc.titleResolving sea ice dynamics in the north-western Ross Sea during the last 2.6 ka: From seasonal to millennial timescalesen_US
dc.typearticleen_US
dc.description.statusPublisheden_US
dc.type.QualityControlPeer-revieweden_US
dc.description.pagenumber106299en_US
dc.subject.INGVSea ice dynamics in the north-western Ross Seaen_US
dc.identifier.doi10.1016/j.quascirev.2020.106299en_US
dc.description.obiettivoSpecifico4A. Oceanografia e climaen_US
dc.description.journalTypeJCR Journalen_US
dc.contributor.authorTesi, T-
dc.contributor.authorBelt, S T-
dc.contributor.authorGariboldi, Karen-
dc.contributor.authorMuschitiello, F-
dc.contributor.authorSmik, Lukas-
dc.contributor.authorFinocchiaro, F-
dc.contributor.authorGiglio, F.-
dc.contributor.authorColizza, Ester-
dc.contributor.authorGazzurra, G-
dc.contributor.authorGiordano, Patrizia-
dc.contributor.authorMorigi, C.-
dc.contributor.authorCapotondi, L.-
dc.contributor.authorNogarotto, Alessio-
dc.contributor.authorKoseoglu, Devrim-
dc.contributor.authorDi Roberto, Alessio-
dc.contributor.authorGallerani, A-
dc.contributor.authorLangone, L.-
dc.contributor.departmentIstituto di Scienze Polari - Consiglio Nazionale delle Ricerche ISP-CNR, Via P. Gobetti 101, 40129, Bologna, Italyen_US
dc.contributor.departmentBiogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UKen_US
dc.contributor.departmentDipartimento di Scienze della Terra, Universit a di Pisa, Via Santa Maria, 53, 56126, Pisa, Italyen_US
dc.contributor.departmentDepartment of Geography, University of Cambridge, Cambridge, CB2 3EN, UKen_US
dc.contributor.departmentBiogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UKen_US
dc.contributor.departmentDipartimento di Matematica e Geoscienze, Universit a di Trieste, Via E. Weiss 2, 34127, Trieste, Italyen_US
dc.contributor.departmentIstituto di Scienze Polari - Consiglio Nazionale delle Ricerche ISP-CNR, Via P. Gobetti 101, 40129, Bologna, Italyen_US
dc.contributor.departmentDipartimento di Matematica e Geoscienze, Universit a di Trieste, Via E. Weiss 2, 34127, Trieste, Italyen_US
dc.contributor.departmentDipartimento di Scienze della Terra, Universit a di Pisa, Via Santa Maria, 53, 56126, Pisa, Italyen_US
dc.contributor.departmentIstituto di Scienze Polari - Consiglio Nazionale delle Ricerche ISP-CNR, Via P. Gobetti 101, 40129, Bologna, Italyen_US
dc.contributor.departmentDipartimento di Scienze della Terra, Universit a di Pisa, Via Santa Maria, 53, 56126, Pisa, Italyen_US
dc.contributor.departmentIstituto di Scienze Marine - Consiglio Nazionale delle Ricerche ISMAR-CNR, Via P. Gobetti 101, 40129, Bologna, Italyen_US
dc.contributor.departmentCampus Scientifico, Universit a Ca’ Foscari Venezia, Via Torino 155, 30172, Venezia, Mestre, Italyen_US
dc.contributor.departmentBiogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UKen_US
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italiaen_US
dc.contributor.departmentIstituto di Scienze Marine - Consiglio Nazionale delle Ricerche ISMAR-CNR, Via P. Gobetti 101, 40129, Bologna, Italyen_US
dc.contributor.departmentIstituto di Scienze Polari - Consiglio Nazionale delle Ricerche ISP-CNR, Via P. Gobetti 101, 40129, Bologna, Italyen_US
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
item.fulltextWith Fulltext-
item.openairetypearticle-
item.grantfulltextrestricted-
crisitem.author.deptIstituto di Scienze Polari - Consiglio Nazionale delle Ricerche ISP-CNR, Via P. Gobetti 101, 40129, Bologna, Italy-
crisitem.author.deptBiogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UK-
crisitem.author.deptDipartimento di Scienze della Terra, Universit a di Pisa, Via Santa Maria, 53, 56126, Pisa, Italy-
crisitem.author.deptDepartment of Geography, University of Cambridge, Cambridge, CB2 3EN, UK-
crisitem.author.deptBiogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UK-
crisitem.author.deptDipartimento di Scienze della Terra, Universit a di Pisa, Via Santa Maria, 53, 56126, Pisa, Italy-
crisitem.author.deptIstituto di Scienze Marine, ISMAR-CNR, Bologna, Italy-
crisitem.author.deptGEUS (Stratigraphy Department Geological Survey of Denmark and Greenland), 1350 Copenhagen, Denmark-
crisitem.author.deptISMAR, Istituto di Scienze del Mare, C.N.R., Via Gobetti 101, 40129 Bologna, Italy-
crisitem.author.deptCampus Scientifico, Universit a Ca’ Foscari Venezia, Via Torino 155, 30172, Venezia, Mestre, Italy-
crisitem.author.deptBiogeochemistry Research Centre, School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, Devon, PL4 8AA, UK-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Pisa, Pisa, Italia-
crisitem.author.deptCNR-ISMAR-
crisitem.author.orcid0000-0002-7978-7496-
crisitem.author.orcid0000-0003-2280-7342-
crisitem.author.orcid0000-0002-6478-6052-
crisitem.author.orcid0000-0002-9026-6667-
crisitem.author.orcid0000-0003-1340-9932-
crisitem.author.orcid0000-0003-3282-7910-
crisitem.author.orcid0000-0002-8034-6049-
crisitem.author.orcid0000-0002-4113-6102-
crisitem.author.orcid0000-0003-1167-8290-
crisitem.author.orcid0000-0002-2634-2899-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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