ebb9d50f-94fb-446b-8e90-de91b3201650 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 2025-01-22 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 Fossil diatom and geochemistry data from an 11,000 year lake sediment core from Isla Hornos, Cape Horn Archipelago 2025-01-22 creation 2025-01-22 revision 2025-01-22 publication 2025-01-22 released 1.0 https://doi.org/10.5285/ebb9d50f-94fb-446b-8e90-de91b3201650 doi GB/NERC/BAS/PDC/01981 https://data.bas.ac.uk/ NE/K004514/1 award Please cite this item as: Perren, B., Kaiser, J., Arz, H., Dellwig, O., Hodgson, D., & Lamy, F. (2025). Fossil diatom and geochemistry data from an 11,000 year lake sediment core from Isla Hornos, Cape Horn Archipelago (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/ebb9d50f-94fb-446b-8e90-de91b3201650 This dataset contains geochemistry measurements and fossil diatom data from a sediment core retrieved from Isla Hornos, in the Cape Horn Archipelago (''IHL''', -55.97 S, -67.28 W, 156 m asl). The dataset consists of diatom relative frequencies, ITRAX scanning XRF counts, ICP-MS and ICP-OES elemental composition, C percent, N percent, S percent, TEX-86-based lakewater temperature reconstructions and magnetic susceptibility measurements. Ages of the sediment samples were assigned based on an age depth model derived from 14C measurements and span the last c. 11,000 years. Funding: This project was funded by UK Natural Environment Research Council Grant NE/K004514/1 to DAH. The research was carried out under permits from Corporacion Nacional Forestal Region de Magallanes y Antartica Chilena and Ministerio de Relaciones Exteriores Direccion de Fronteras y Limites del Estado. No credit. completed Perren, Bianca British Antarctic Survey Researcher author Kaiser, Jerome Leibniz Institute for Baltic Sea Research Warnemunde Researcher author Arz, Helge Leibniz Institute for Baltic Sea Research Warnemunde Researcher author Dellwig, Olaf Leibniz Institute for Baltic Sea Research Warnemunde Researcher author Hodgson, Dominic British Antarctic Survey Researcher author Lamy, Frank Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research 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 > Biosphere > Microbiota Taxonomy > Diatoms EARTH SCIENCE > Paleoclimate > Paleoclimate Reconstructions EARTH SCIENCE > Solid Earth > Geochemistry 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 Cape Horn ITRAX Southern Ocean TEX-86 Westerlies diatoms geochemistry magnetic susceptibility palaeoclimate palaeolimnology theme Hornos Island, Cape Horn Archipelago, Chile. place Habitats and biotopes 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 Data supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url crossReference textTable eng utf8 geoscientificInformation -67.28 -67.28 -55.97 -55.97 156.0 156.0 urn:ogc:def:crs:EPSG::5714 MSL height Not specific to any location or epoch. Hydrography. 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 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=ebb9d50f-94fb-446b-8e90-de91b3201650 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Coring: Sediment cores were taken in March 2016 from the deepest part of Isla Hornos Lake (IHL; Zmax = 10.7 m) from a floating platform using both piston and gravity corers to create a composite core length of 4.13 m. Cores were packed onboard the Polarstern and brought back to Germany. At the Leibniz Institute for Baltic Sea Research the cores were split lengthwise, photographed and scanned for micro-XRF and magnetic susceptibility. The working halves were subsampled at 1.0 cm intervals for diatoms and other analyses. Age-depth model: Age determinations were made using 14C radiometric methods on a range of sediment fractions. Age-depth models were generated using the software package BACON in R (Blaauw and Christen, 2011). Diatoms: Diatoms were isolated from sediments following standard digestion protocol for large sample numbers, using heat and oxidation with 30% hydrogen peroxide and mounted on plain glass coverslips using Naphrax mounting medium. At least 400 valves were identified per sample at 1000x using Subantarctic and South American reference literature. TEX86: Lipids were extracted from sediments with a mixture of dichloromethane and methanol. After adding a C46 GDGT as internal standard for quantification, the polar fraction containing GDGTs was isolated by microscale flash column chromatography. The fraction was then filtered. GDGTs were analysed by high performance liquid chromatography atmospheric pressure chemical ionization mass spectrometry (HPLC APCI-MS; Thermo Scientific(TM)). The global lake calibration with error bars of +/-3.7°C was used to convert TEX86 values into mean annual lake surface temperature estimates (Powers et al., 2010). Magnetic Susceptibility: High-resolution magnetic susceptibility data was accomplished using a Bartington MS2E/1 spot-reading sensor integrated into an automatic logging system. Data shown are 5 point averages. CNS: Bulk sediment TC, TN and TS were measured at the IOW, Germany, with a EA1110 CHN (CE instruments) elemental analyser. XRF: Semi quantitative geochemical element data of the sediment core was acquired using an ITRAX X-ray fluorescence (XRF) core scanner at the Leibniz Institute for Baltic Sea Research Warnemünde (IOW). The XRF scanner was equipped with a chromium (Cr) tube and operated at 30 kV and 30 mA, with an exposure time of 15 seconds, and a scanning resolution of 1.0 mm. ICP MS/OES: The concentrations of major elements (Ti, Al, Fe, Mg, Ca, Na, K, P and S) in sediment acid digestions were determined by inductively coupled plasma optical emission spectroscopy (ICP-OES, iCAP 7400 Duo, Thermo Fisher Scientific) using external calibration and Sc (2 ppm) as internal standard. Following automated online dilution (5-fold) of the digestions and addition of the internal standards Be, Rh and Ir by a PrepFAST system (Elemental Scientific), the trace metal (As, Ba, Cd, Co, Cr, Cu, Mn, Mo, Ni, Rb, Sc, Se, Sr, Th, U, V, Zn and REEs) concentrations were measured by inductively coupled plasma mass spectrometry (ICP-MS, iCAP Q, Thermo Fisher Scientific). The detailed methodology for diatoms, bulk sediment TC, TN and TS, XRF, magnetic susceptibility, ICP MS/OES, and GDGT/TEX-86 analysis can be found in Perren et al. (2025) Data collection: microXRF asNeeded completed