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dc.contributor.authorKöseoğlu, D
dc.contributor.authorBelt, Simon
dc.contributor.authorHusum, K
dc.contributor.authorKnies, J
dc.date.accessioned2018-10-04T10:45:59Z
dc.date.issued2018-11-01
dc.identifier.issn0146-6380
dc.identifier.urihttp://hdl.handle.net/10026.1/12451
dc.description.abstract

© 2018 Elsevier Ltd The development of various combinative methods for Arctic sea ice reconstruction using the sympagic highly branched isoprenoid (HBI) IP25in conjunction with pelagic biomarkers has often facilitated more detailed descriptions of sea ice conditions than using IP25alone. Here, we investigated the application of the Phytoplankton-IP25index (PIP25) and a recently proposed Classification Tree (CT) model for describing temporal shifts in sea ice conditions to assess the consistency of both methods. Based on biomarker data from three downcore records from the Barents Sea spanning millennial timescales, we showcase apparent and potential limitations in both approaches, and provide recommendations for their identification or prevention. Both methods provided generally consistent outcomes and, within the studied cores, captured abrupt shifts in sea ice regimes, such as those evident during the Younger Dryas, as well as more gradual trends in sea ice conditions during the Holocene. The most significant discrepancies occurred during periods of highly unstable climate change, such as those characteristic of the Younger Dryas–Holocene transition. Such intervals of increased discrepancy were identifiable by significant changes of HBI distributions and correlations to values not observed in proximal surface sediments. We suggest that periods of highly fluctuating climate that are not represented in modern settings may hinder the performance and complementary application of PIP25and CT-based methods, and that data visualisation techniques should be employed to identify such occurrences in downcore records. Additionally, due to the reliance of both methods on biomarker distributions, we emphasise the importance of accurate and consistent biomarker quantification.

dc.format.extent82-94
dc.languageen
dc.language.isoen
dc.publisherElsevier BV
dc.subjectArctic
dc.subjectSea ice
dc.subjectHBI
dc.subjectBiomarker
dc.subjectClassification tree
dc.subjectYounger Dryas
dc.subjectIP25
dc.subjectPIP25
dc.subjectBarents Sea
dc.titleAn assessment of biomarker-based multivariate classification methods versus the PIP<inf>25</inf>index for paleo Arctic sea ice reconstruction
dc.typejournal-article
dc.typeJournal Article
plymouth.author-urlhttps://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000448941300010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008
plymouth.volume125
plymouth.publication-statusPublished
plymouth.journalOrganic Geochemistry
dc.identifier.doi10.1016/j.orggeochem.2018.08.014
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Geography, Earth and Environmental Sciences
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA07 Earth Systems and Environmental Sciences
plymouth.organisational-group/Plymouth/Research Groups
plymouth.organisational-group/Plymouth/Research Groups/Marine Institute
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
plymouth.organisational-group/Plymouth/Users by role/Researchers in ResearchFish submission
dcterms.dateAccepted2018-08-29
dc.rights.embargodate2019-8-30
dc.rights.embargoperiodNot known
rioxxterms.versionofrecord10.1016/j.orggeochem.2018.08.014
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-11-01
rioxxterms.typeJournal Article/Review


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