Abstract:
We present steady-state ice thickness, bed elevation, and ice surface elevation output from simulations of the Antarctic Ice Sheet (AIS) on a suite of reconstructed Antarctic palaeotopographies using the DeConto and Pollard (DP16) ice sheet model. Ice surface mass balance inputs were provided using the GENESIS v3.0 global atmosphere general circulation model coupled to a 50 m slab ocean model, which provides boundary meteorology for the RegCM3 regional climate model. Three climate/ocean scenarios were simulated: (1) cold climate orbital parameters, preindustrial CO2 levels (280 ppm) and modern ocean temperatures, (2) a subsequent shift to warm climate orbital parameters, an increase in CO2 levels to 500 ppm, and a 5 deg C ocean temperature rise, and (3) as for (2), but with CO2 levels increased to 840 ppm. The steady-state simulations were performed on a suite of reconstructed Antarctic palaeotopographies pertaining to the following four time slices: (1) the Eocene-Oligocene boundary (EOB; ca. 34 Ma), (2) the Oligocene-Miocene boundary (OMB, ca. 23 Ma), (3) the mid-Miocene (MM; ca. 14 Ma), and (4) the mid-Pliocene (MP; ca. 3.5 Ma). Simulations were performed for minimum, median, and maximum end-member topographies, and equivalent simulations were run on the modern (ice-free) Antarctic bed topography for comparison. Further details are given in the accompanying publication. For more information, please contact G. Paxman.
Funding was provided by NERC Ph.D. studentship NE/L002590/1.
Keywords:
Antarctic Ice Sheet, climate change, ice sheet sensitivity, landscape evolution, palaeotopography
Paxman, G., Gasson, E., Jamieson, S., Bentley, M., & Ferraccioli, F. (2020). Simulations of Antarctic Ice Sheet sensitivity to climate and ocean forcing for a suite of Antarctic palaeotopographies (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/d67a07a8-becc-419d-99f7-5578928461ca
| Access Constraints: | No restrictions apply. |
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| Use Constraints: | This data is covered by a UK Open Government Licence (http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions: 1. To cite the data in any publication as follows: DATA REFERENCE Paxman, G., Gasson, E., Jamieson, S., Bentley, M., & Ferraccioli, F. (2020). Simulations of Antarctic Ice Sheet sensitivity to climate and ocean forcing for a suite of Antarctic palaeotopographies (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/D67A07A8-BECC-419D-99F7-5578928461CA LITERATURE REFERENCE Paxman, G. J. G., Gasson, E. G. W., Jamieson, S. S. R., Bentley, M. J., Ferraccioli, F. 2020. Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. Geophysical Research Letters (in press). 2. The user recognizes the limitations of data. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data. |
| Creation Date: | 2020-10-08 |
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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 | Guy J G Paxman |
| Role(s) | Technical Contact, Investigator |
| Organisation | Durham University |
| Name | Edward Gasson |
| Role(s) | Investigator |
| Organisation | University of Bristol |
| Name | Stewart S R Jamieson |
| Role(s) | Investigator |
| Organisation | Durham University |
| Name | Michael Bentley |
| Role(s) | Investigator |
| Organisation | Durham University |
| Name | Fausto Ferraccioli |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Paxman, G. J. G., Gasson, E. G. W., Jamieson, S. S. R., Bentley, M. J., Ferraccioli, F. 2020. Long-term increase in Antarctic Ice Sheet vulnerability driven by bed topography evolution. Geophysical Research Letters (in press). | |
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| Quality: | The ice sheet model output reflect quasi-equilibrium conditions and are gridded at 10 km horizontal resolution. The ice sheet model includes parameterisations for the marine ice cliff failure and marine ice shelf hydrofracture processes. Full asynchronous coupling feedback between the regional climate model and the ice sheet model is not performed; the ice sheet extent in the regional climate model was kept constant. | |
| Lineage: | Model output were produced using the DeConto and Pollard (2016) ice sheet model (version DP16). | |
| Paleo Temporal Coverage: | |
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| Paleo Start Date | 34 Ma |
| Paleo End Date | present |
| Chronostratigraphic Unit | N/A |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -90 |
| Northernmost | -60 |
| Longitude | |
| Westernmost | -180 |
| Easternmost | 180 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Data Resolution: | |
| Latitude Resolution | N/A |
| Longitude Resolution | N/A |
| Horizontal Resolution Range | 10 km - < 50 km or approximately .09 degree - < .5 degree |
| Vertical Resolution | N/A |
| Vertical Resolution Range | N/A |
| Temporal Resolution | N/A |
| Temporal Resolution Range | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | N/A |
| Data Collection: | DeConto and Pollard (2016) ice sheet model (version DP16). |
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| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 187 MB |
| Distribution Format | netCDF |
| Fees | N/A |
| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 2.1 kB |
| Distribution Format | ASCII |
| Fees | N/A |
| Data Storage: | 13 grid files in NetCDF 4 (classic) format (.nc), plus accompanying 'ReadMe' text file (.txt). Spatial coordinates are projected in EPSG:3031 (WGS84 Antarctic Polar Stereographic). Model was run and data were output on 2020-02-06. |