Abstract:
The file contains Southern Hemisphere winter (September) sea ice concentration (sic) from a simulation performed using the isotope-enabled HadCM3 climate model forced with early last interglacial boundary conditions, centred approximately 128,000 years ago. The resulting sic represents a reduction in winter sea ice area of approximately 54% relative to pre-industrial and is proposed as the best explanation for the Antarctic ice core data from 128,000 years ago. The spatial pattern of sea ice retreat was determined using a large ensemble of model experiments and a pattern search optimization approach to match the last interglacial ice core isotope peak. Further details can be found in the published manuscript (https://doi.org/10.1002/2017GL074594).
This work was funded by NERC grants NE/P009271/1, NE/P013279/1, and NE/K004514/1.
Keywords:
Antarctic, Ice core, Isotope, Last interglacial, Southern Hemisphere sea ice
Holloway, M. (2018). Southern Hemisphere winter sea ice concentration simulated by HadCM3 to best explain the early last interglacial Antarctic isotope peak (Version None) [Data set]. Polar Data Centre, Natural Environment Research Council, UK Research & Innovation, UK. https://doi.org/10.5285/0f3d9228-2f4a-4f2c-bbe6-ee8a123db58d
| Access Constraints: | No restrictions apply to this dataset. Access to the Met Office Unified Model source code is available under license from the Met Office at http://www.metoffice.gov.uk/ research/collaboration/um-collaboration. The climate model data are available on request from http://www.bridge.bris.ac.uk/resources/simulations. |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2018-05-23 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Louise Sime |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Max Holloway |
| Role(s) | Technical Contact, Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Holloway, M. D., Sime, L. C., Allen, C. S., Hillenbrand, C.-D., Bunch, P., Wolff, E., & Valdes, P. J. (2017). The spatial structure of the 128 ka Antarctic sea ice minimum. Geophysical Research Letters, 44. https://doi.org/10.1002/2017GL074594 | |
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| Quality: | Masked NaN values represent grid points that are land. The grid is 1445x113 in longitude, latitude. |
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| Lineage/Methodology: | This is output from a simulation using the isotope-enabled HadCM3 climate model forced with early last interglacial boundary conditions (orbital configuration and greenhouse-gas concentrations), centred approximately 128,000 years ago. Sea ice concentration has been re-gridded from the native global model grid to a higher resolution latitude-longitude grid covering the latitude range from 52.5 to 80.5 deg S. Further details can be found in the published manuscript (https://doi.org/10.1002/2017GL074594). | |
| Paleo Temporal Coverage: | |
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| Paleo Start Date | ~128 Ka |
| Paleo End Date | ~128 Ka |
| Chronostratigraphic Unit | PLEISTOCENE |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -80.5 |
| Northernmost | -52.5 |
| Longitude | |
| Westernmost | -180 |
| Easternmost | 180 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Southern Ocean |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 1.3 MB |
| Distribution Format | netCDF |
| Fees | N/A |
| Data Storage: | One netCDF file, approximately 1.3 MB. |