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dc.contributor.authorWang, KJen
dc.contributor.authorHuang, Yen
dc.contributor.authorMajaneva, Men
dc.contributor.authorBelt, STen
dc.contributor.authorLiao, Sen
dc.contributor.authorNovak, Jen
dc.contributor.authorKartzinel, TRen
dc.contributor.authorHerbert, TDen
dc.contributor.authorRichter, Nen
dc.contributor.authorCabedo-Sanz, Pen
dc.descriptionNo embargo required.en

<jats:title>Abstract</jats:title><jats:p>Alkenones are biomarkers produced solely by algae in the order Isochrysidales that have been used to reconstruct sea surface temperature (SST) since the 1980s. However, alkenone-based SST reconstructions in the northern high latitude oceans show significant bias towards warmer temperatures in core-tops, diverge from other SST proxies in down core records, and are often accompanied by anomalously high relative abundance of the C<jats:sub>37</jats:sub> tetra-unsaturated methyl alkenone (%C<jats:sub>37:4</jats:sub>). Elevated %C<jats:sub>37:4</jats:sub> is widely interpreted as an indicator of low sea surface salinity from polar water masses, but its biological source has thus far remained elusive. Here we identify a lineage of Isochrysidales that is responsible for elevated C<jats:sub>37:4</jats:sub> methyl alkenone in the northern high latitude oceans through next-generation sequencing and lab-culture experiments. This Isochrysidales lineage co-occurs widely with sea ice in marine environments and is distinct from other known marine alkenone-producers, namely <jats:italic>Emiliania huxleyi</jats:italic> and <jats:italic>Gephyrocapsa oceanica</jats:italic>. More importantly, the %C<jats:sub>37:4</jats:sub> in seawater filtered particulate organic matter and surface sediments is significantly correlated with annual mean sea ice concentrations. In sediment cores from the Svalbard region, the %C<jats:sub>37:4</jats:sub> concentration aligns with the Greenland temperature record and other qualitative regional sea ice records spanning the past 14 kyrs, reflecting sea ice concentrations quantitatively. Our findings imply that %C<jats:sub>37:4</jats:sub> is a powerful proxy for reconstructing sea ice conditions in the high latitude oceans on thousand- and, potentially, on million-year timescales.</jats:p>

dc.format.extent0 - 0en
dc.publisherSpringer Science and Business Media LLCen
dc.titleGroup 2i Isochrysidales produce characteristic alkenones reflecting sea ice distributionen
dc.typeJournal Article
plymouth.journalNature Communicationsen
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
dc.rights.embargoperiodNot knownen
rioxxterms.typeJournal Article/Reviewen

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