9b138820-eec3-43ae-a49b-068a9f5931a4 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 2021-12-14 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 HadCM3 and HadGEM3 LIG model outputs: A sea ice-free Arctic 2021-12-14 creation 2021-12-14 revision 2021-12-14 publication 2021-12-14 released 1.0 https://doi.org/10.5285/9b138820-eec3-43ae-a49b-068a9f5931a4 doi GB/NERC/BAS/PDC/01591 https://data.bas.ac.uk/ NE/P013279/1 award NE/P009271/1 award Please cite this item as: Guarino, M., & Sime, L. (2021). HadCM3 and HadGEM3 LIG model outputs: A sea ice-free Arctic (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/9b138820-eec3-43ae-a49b-068a9f5931a4 The HadGEM3 (HadGEM3-GC3.1 or HadGEM3-GC3.1-N96ORCA1) PI simulation was initialized using the standard CMIP6 protocol using constant 1850 GHGs, ozone, solar, tropospheric aerosol, stratospheric volcanic aerosol and land-use forcing. The PI spin-up was 700 model-years, which allowed the land and oceanic masses to attain approximate steady state. The HadGEM3 LIG (Last Interglacial) simulation was initialized from the end of the spin-up phase of the equivalent pre-industrial (PI) simulation. After initialization, the LIG was run for 350 model-years. This 350 LIG spin-up permits the model to reach atmospheric equilibrium and to achieve an upper-ocean equilibrium. The model was then run for a further 200 model-years of LIG production run. This has been demonstrated to be an adequate run length to appropriately capture the model internal variability. This dataset contains outputs from the 200 years of production run of the period. The HadCM3 PI simulation was run for a period of over 600 years. The HadCM3 LIG simulation was initialized from the end of a previous CMIP5 LIG simulation, which was of length 400 years and initiated from the end of the corresponding PI, and run for further 250 years. The total spin-up phase for the HadCM3 LIG simulation used in this study was thus 600 model-years, and the length of the production (at atmospheric and upper-oceanic equilibrium) LIG HadCM3 simulation is 50 model-years. This work was funded by NERC standard research grant nos. NE/P013279/1 and NE/P009271/1. No credit. completed Guarino, Maria Vittoria British Antarctic Survey Researcher author Sime, Louise British Antarctic Survey 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 > Cryosphere > Sea Ice > Sea Ice Concentration EARTH SCIENCE > Cryosphere > Sea Ice 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 Arctic HadGEM3 Last Interglacial ice-free Arctic sea ice theme Global 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 Data supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url largerWorkCitation url url largerWorkCitation doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference url url crossReference textTable eng utf8 climatologyMeteorologyAtmosphere -180.0 180.0 -90.0 90.0 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 application/x-hdf application/netcdf bytes 30303846 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=9b138820-eec3-43ae-a49b-068a9f5931a4 WWW:LINK-1.0-http--link Get Data Download data download bytes 30303846 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=9b138820-eec3-43ae-a49b-068a9f5931a4 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The simulations were carried out using the HadGEM3 and HadCM3 climate models. These model simulations were run on the ARCHER UK National Supercomputing Service (http://www.archer.ac.uk) and processed on the JASMIN data analysis platform (http://jasmin.ac.uk/). They are Tier 1 LIG simulations, on the basis of the standard CMIP6-PMIP4 LIG experimental protocol. The prescribed LIG (127,000 yr) protocol differs from the CMIP6 PI simulation protocol in astronomical parameters and the atmospheric trace GHG concentrations. LIG astronomical parameters are prescribed according to orbital constants43, and atmospheric trace GHG concentrations are based on ice-core measurements. other boundary conditions, including solar activity, ice sheets and aerosol emissions, are identical to the PI simulation. We run two LIG simulations, one using the UK CMIP6 HadGEM3 model and the other using the CMIP3 HadCM3 model. HadGEM3 is the lowest-resolution version of the UK CMIP6 physical climate model. It is a global coupled atmosphere-land-ocean-ice model that comprises the Unified Model atmosphere model, the JULES land surface model, the NEMO ocean model and the CICE sea-ice model. Data collection: HadGEM3 (HadGEM3-GC3.1 or HadGEM3-GC3.1-N96ORCA1). HadCM3. Simulations were run on the ARCHER UK National Supercomputing Service (http://www.archer.ac.uk) and processed on the JASMIN data analysis platform (http://jasmin.ac.uk/), between 2018 and 2020. Data quality: The Unified Model atmospheric component of HadGEM3 utilizes a horizontal grid spacing of approximately 135 km on a regular latitude-longitude grid. The NEMO ocean model of HadGEM3 employs an orthogonal curvilinear grid with a 1° resolution everywhere but near the equator, where it decreases to 0.33°. The atmosphere and ocean models use 85 and 75 vertical (pressure) levels, respectively. HadCM3 is the UK CMIP3 coupled atmosphere-ocean general circulation model30. Our version of HadCM3 includes the dynamic vegetation model TRIFFID (ref. 47) and the land surface model MOSES 2.1 (ref. 48). The horizontal resolution of the atmosphere model is 3.75° longitude by 2.5° latitude. The ocean model uses a resolution of 1.25° longitude by 1.25° latitude. The atmospheric and oceanic components use 19 and 20 vertical levels, respectively. asNeeded completed