Abstract:
This dataset provides model output for 20th and 21st-century ice-ocean simulations in the Amundsen Sea. The simulations are performed with the MITgcm model at 1/10 degree resolution, including components for the ocean, sea ice, and ice shelf thermodynamics. Atmospheric forcing is provided by the CESM1 climate model for the historical period (1920-2005) and four future scenarios (2006-2100), using 5-10 ensemble members each. The open ocean boundaries are forced by either the corresponding CESM1 simulation or a present-day climatology. The simulations were completed in 2022 by Kaitlin Naughten at the British Antarctic Survey (Polar Oceans team).
UKRI Fund for International Collaboration NE/S011994/1
Keywords:
Amundsen Sea, Antarctica, ice shelves, modelling, ocean, sea ice
Naughten, K., Holland, P., & De Rydt, J. (2023). Amundsen Sea MITgcm model output forced with CESM1 historical and future climate scenarios, 1920-2100 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/b692f76f-eac8-466a-a008-32e9ba3e7b44
| Access Constraints: | None. |
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| Use Constraints: | Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2023-07-13 |
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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 Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Kaitlin Naughten |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Paul R Holland |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Jan De Rydt |
| Role(s) | Investigator |
| Organisation | Northumbria University |
| Parent Dataset: | N/A |
| Reference: | Naughten, K.A., Holland, P.R., and De Rydt, J. (2023). ''Unavoidable future increase in West Antarctic ice-shelf melting over the 21st century''. Nature Climate Change, in review. | |
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| Quality: | Values which are identically zero or masked represent the land and ice shelf mask. | |
| Lineage: | Simulations were performed with the Massachusetts Institute of Technology general circulation model (MITgcm) version 67s, over the Amundsen Sea region (140 degrees W:80 degrees W, 76 degrees S:62 degrees S). Resolution is 1/10 degrees in the horizontal, with 50 levels in the vertical. Bathymetry and ice shelf topography were generated using BedMachine version 2. Atmospheric forcing is given by the CESM1 Large Ensemble (1920-2005 historical, 2006-2100 RCP 8.5, first 10 members), the CESM1 Medium Ensemble (2006-2080 RCP 4.5, first 10 members), the CESM1 Low Warming 2C Ensemble (2006-2100, first 10 members), and the CESM1 Low Warming 1.5C Ensemble (2006-2100, first 5 members). Lateral boundary conditions were derived from the corresponding CESM1 ensembles, except for the ''Fixed BC'' experiments which used the World Ocean Atlas 2018 for temperature and salinity, and the Biogeochemical Southern Ocean State Estimate iteration 122 for all other variables. Ice shelf buttressing diagnostic simulations were performed using the Ua ice flow model on the same domain. | |
| Temporal Coverage: | |
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| Start Date | 1920-01-01 |
| End Date | 2005-12-31 |
| Start Date | 2006-01-01 |
| End Date | 2100-12-31 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -76 |
| Northernmost | -62 |
| Longitude | |
| Westernmost | -140 |
| Easternmost | -80 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | 0 m |
| Max Depth | -5610 m |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | N/A |
| Vertical Resolution | 50 vertical layers 10-300m |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Southern Ocean |
| Detailed Location | Amundsen Sea |
| Data Collection: | The raw MITgcm output was converted to NetCDF using the xmitgcm python package, and then processed into timeseries, Hovmollers, and trends using the mitgcm_python library (https://github.com/knaughten/mitgcm_python). |
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| Data Storage: | 277 NetCDF files, each containing one variable for a single simulation. The file types are timeseries (averaged/integrated over specific regions; monthly resolution), Hovmollers (horizontally averaged over specific regions while preserving the depth dimension; monthly resolution), trend files (trends over given simulation period based on annual averages, at each 2D or 3D point in the domain), and latitude-longitude files for 2D variables (all variables constant in time). Total approximate volume 13 GB. |
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