Complementary biomarker-based methods for characterising Arctic sea ice conditions: A case study comparison between multivariate analysis and the PIP<inf>25</inf>index
dc.contributor.author | Köseoğlu, D | |
dc.contributor.author | Belt, Simon | |
dc.contributor.author | Smik, L | |
dc.contributor.author | Yao, H | |
dc.contributor.author | Panieri, G | |
dc.contributor.author | Knies, J | |
dc.date.accessioned | 2017-12-08T14:23:30Z | |
dc.date.issued | 2018-02-01 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.issn | 1872-9533 | |
dc.identifier.uri | http://hdl.handle.net/10026.1/10391 | |
dc.description.abstract |
© 2017 Elsevier Ltd The discovery of IP 25 as a qualitative biomarker proxy for Arctic sea ice and subsequent introduction of the so-called PIP 25 index for semi-quantitative descriptions of sea ice conditions has significantly advanced our understanding of long-term paleo Arctic sea ice conditions over the past decade. We investigated the potential for classification tree (CT) models to provide a further approach to paleo Arctic sea ice reconstruction through analysis of a suite of highly branched isoprenoid (HBI) biomarkers in ca. 200 surface sediments from the Barents Sea. Four CT models constructed using different HBI assemblages revealed IP 25 and an HBI triene as the most appropriate classifiers of sea ice conditions, achieving a > 90% cross-validated classification rate. Additionally, lower model performance for locations in the Marginal Ice Zone (MIZ) highlighted difficulties in characterisation of this climatically-sensitive region. CT model classification and semi-quantitative PIP 25 -derived estimates of spring sea ice concentration (SpSIC) for four downcore records from the region were consistent, although agreement between proxy and satellite/observational records was weaker for a core from the west Svalbard margin, likely due to the highly variable sea ice conditions. The automatic selection of appropriate biomarkers for description of sea ice conditions, quantitative model assessment, and insensitivity to the c-factor used in the calculation of the PIP 25 index are key attributes of the CT approach, and we provide an initial comparative assessment between these potentially complementary methods. The CT model should be capable of generating longer-term temporal shifts in sea ice conditions for the climatically sensitive Barents Sea. | |
dc.format.extent | 406-420 | |
dc.language | en | |
dc.language.iso | en | |
dc.publisher | Elsevier BV | |
dc.subject | Arctic | |
dc.subject | IP25 | |
dc.subject | Sea ice | |
dc.subject | Biomarker | |
dc.subject | HBI | |
dc.subject | Classification tree | |
dc.subject | PIP25 | |
dc.title | Complementary biomarker-based methods for characterising Arctic sea ice conditions: A case study comparison between multivariate analysis and the PIP<inf>25</inf>index | |
dc.type | journal-article | |
dc.type | Journal Article | |
plymouth.author-url | https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000424972200023&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008 | |
plymouth.volume | 222 | |
plymouth.publication-status | Accepted | |
plymouth.journal | Geochimica et Cosmochimica Acta | |
dc.identifier.doi | 10.1016/j.gca.2017.11.001 | |
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.dateAccepted | 2017-11-01 | |
dc.rights.embargodate | 2018-11-10 | |
dc.identifier.eissn | 1872-9533 | |
dc.rights.embargoperiod | Not known | |
rioxxterms.versionofrecord | 10.1016/j.gca.2017.11.001 | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.licenseref.startdate | 2018-02-01 | |
rioxxterms.type | Journal Article/Review |