Niu, Lu; Lohmann, Gerrit; Gowan, Evan J (2019): Simulations of millennial-scale climate variability influence on Northern Hemisphere ice sheet mean state [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.901838, Supplement to: Niu, L et al. (2019): Climate noise influences ice sheet mean state. Geophysical Research Letters, https://doi.org/10.1029/2019GL083717
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Abstract:
This study mainly focuses on the millennial-scale climate variability influence on the Northern Hemisphere ice sheet evolution during the past glacial-interglacial cycles. We use the 3D thermodynamical Parallel Ice Sheet Model (PISM) version 0.7.3 to simulate the ice sheets. An index method is used to generate the climate between these states to force the model. In this method, the time-dependent climate evolution is represented by the combination of a time series and two extreme climate conditions. We conducted two experiments. In the first experiment, the ice sheet model is forced with climate that contains millennial-scale oscillations (GL_hf). In the other experiment, the millennial-scale oscillations are removed (GL_lf). The results show that the simulated ice sheet volume is significantly reduced when forced with large amplitude climate fluctuations compared to the case without. Sensitivity experiments are also conducted to see how the amplitude of climate noise affects the simulated ice sheets.
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
50 data points
Data
| 1 Content | 2 File name | 3 File format | 4 File size [kByte] | 5 URL file |
|---|---|---|---|---|
| Index time series for forcing experiment GL_hf | Index_800ka_GLsyn_Barker2011_combine5kGISP2 | NC | 192.063 | Index_800ka_GLsyn_Barker2011_combine5kGISP2.nc |
| Index time series for forcing experiment GL_lf | Index_800ka_GLsyn_Barker2011_combine5kGISP2_5krunmean | NC | 192.063 | Index_800ka_GLsyn_Barker2011_combine5kGISP2_5krunmean.nc |
| The time series results from simulation experiment GL_hf | ts_800ka_index_GLsynGISP5k | NC | 643.766 | ts_800ka_index_GLsynGISP5k.nc |
| The time series results from simulation experiment GL_lf | ts_800ka_index_GLsynGISP55kmean | NC | 630.559 | ts_800ka_index_GLsynGISP55kmean.nc |
| The simulated ice sheet thickness at 158000 yr BP from GL_hf | thk_-158000_GLsynGISP5k | NC | 2144.383 | thk_-158000_GLsynGISP5k.nc |
| The simulated ice sheet thickness at 158000 yr BP from GL_lf | thk_-158000_GLsynGISP55kmean | NC | 2142.441 | thk_-158000_GLsynGISP55kmean.nc |
| Sensitivity experiments: the forcing index time series that are added with different amplitude of noises (NetCDF) | index_120k_ | ZIP | 104.544 | index_120k_.zip |
| Sensitivity experiments: the simulated ice sheet time series (NetCDF) | ts_index_120k_ | ZIP | 449.912 | ts_index_120k_.zip |
| The simulated mean surface mass balance over the ice sheet domain for experiment GL_hf | smb_GLsyn_-250000_0_d50 | NC | 72.094 | smb_GLsyn_-250000_0_d50.nc |
| The simulated mean surface mass balance over the ice sheet domain for experiment GL_lf | smb_GLsyn5kmean_-250000_0_d50 | NC | 72.094 | smb_GLsyn5kmean_-250000_0_d50.nc |