9caf74c4-7054-4539-81b8-d4f942afc358 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2017-12-07 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Data from the Arctic biomarker IP25 and associated open water and marginal ice zone biomarkers brassicasterol and HBI III from the eastern Bering Sea during the Pleistocene 2017-12-07 creation 2017-12-07 revision 2017-12-07 publication 2017-12-07 released 1 https://doi.org/10.5285/9caf74c4-7054-4539-81b8-d4f942afc358 doi GB/NERC/BAS/PDC/01048 https://data.bas.ac.uk/ NE/L002434/1 award Please cite this item as: doi:10.5285/9caf74c4-7054-4539-81b8-d4f942afc358 \ short-doi:10/ch73 This data set comprises sea ice-related biomarkers for three time intervals, corresponding to the pre-MPT (1.53-1.36 Ma), the MPT (1.22-0.8 Ma), and the post-MPT (0.5-0.34 Ma) climate cycles from International Ocean Discovery Program (IODP) Site U1343 in the eastern Bering Sea (57deg33.4'N, 176deg49.0'W, 1950 m water depth). The biomarkers are the Arctic sea ice biomarker IP25, together with HBI III and brassicasterol, indicative of open water in the ice marginal zone and general phytoplankton production, respectively. Funding was provided by the NERC grant NE/L002434/1. No credit. completed Detlef, Henrieka Cardiff University Researcher author Belt, Simon Plymouth University Researcher author Sosdian, Sindia Cardiff University Researcher author Smik, Lukas Plymouth University Researcher author Lear, Caroline Cardiff University Researcher author Hall, Ian Cardiff University Researcher author Cabedo-Sanz, Patricia Plymouth University Researcher author Husum, Katrine Norwegian Polar Institute Researcher author Kender, Sev University of Exeter Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Cryosphere > Sea Ice > Ice Extent EARTH SCIENCE > Oceans > Marine Sediments > Sediment Chemistry EARTH SCIENCE > Oceans > Ocean Chemistry > Marine Geochemistry EARTH SCIENCE > Paleoclimate > Paleoclimate Reconstructions theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Bering Sea Biomarker IP25 Mid-Pleistocene transition Sea ice theme Bering Sea Arctic place Oceanographic geographical features Geology theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/ otherRestrictions This data is governed by the NERC data policy and supplied under Open Government Licence v.3 otherRestrictions No restrictions apply. url url crossReference textTable eng utf8 climatologyMeteorologyAtmosphere geoscientificInformation -176.8167 -176.8167 57.5511 57.5511 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor bytes 1 https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=9caf74c4-7054-4539-81b8-d4f942afc358 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The data was generated using samples from International Ocean Discovery Program Site U1343 (Leg 323) in the eastern Bering Sea. The samples were freeze dried at -45°C and 0.2 mbar for 48 hours using a Thermo Savant Modulyo D freeze drier and an Edwards K4 Modulyo freeze drier at Plymouth and Cardiff University, respectively. The highly branched isoprenoid (HBI) lipids were extracted from 3g freeze dried sediment as described in Belt et al. (2012). Additionally sulphur removal using tetrabutylammonium sulphite reagent (TBA) (Cabedo-Sanz and Belt 2015) was performed for all samples prior to silica column chromatographic purification of the total organic extracts. The samples were measured on the gas chromatography mass spectrometer (Agilent 7890A GC coupled to a 5975 series mass selective detector fitted with an Agilent HP-5ms column) at Plymouth University using the operating conditions specified in Belt et al. 2012. The identification of individual lipids was based on their characteristic retention time and mass spectra and quantification was achieved by integrating the peak area of selected ions (m/z 350 (IP25); 346 (HBI III); 470 (brassicasterol)) in comparison to the peak area of the internal standards added to each sample (Belt et al. 2012). Quantification of individual lipids also considers an instrumental response factor obtained from known concentrations of biomarker lipids in the standard sediments (Belt et al. 2012). The data is provided in ng g-1 dry sediment (sed). Data quality: A procedural blank was added to each extraction batch to screen for contamination. The 4-year instrumental uncertainty is < 10%. The average sample resolution for all three time intervals is 5 ka, however, the sample resolution is highly variable. asNeeded completed