This page describes and gives links to the data from Gregory et al. (2020) on Large and irreversible future decline of the Greenland ice-sheet.
Directory glimmer.xy contains subdirectories named by runid, where runid identifies the experiment as tabulated below. Each directory contains files gland20.diag[N].nc. These are the CF-netCDF Glimmer ice-sheet model output files for the run, where N is a sequence number. If there is file without N specified, it is last file of the run. There is one timeslice for every 10 ice-sheet years. The timeslices are in order within each file but the time coordinates are only an index. The gridboxes are 20 km square. The variables in the files are fairly well-described by attributes. The ice thickness is thk, in metres of ice, whose density in Glimmer is 917 kg m-3.
Directory glimmer.t contains subdirectories named runid.glimmer. Each contains files ivol.nc, iarea.nc and some contain acab.nc. These are the ice-sheet volume (metres of sea-level equivalent, assuming a global ocean area of 3.625e14 m2 and water density of 1000 kg m-3), area (millions of km2) and area-integral SMB (Gt yr-1) from Glimmer, for the same timeslices as the glimmer.xy files of the run (all years concatenated for each run).
Directory famous.xy contains files named runid.PPPPP[m].nc, where PPPPPP[m] is 003000 for 30-year means, 003003m for 30-year multiannual summer means, 010000 for 100-year means, 010003m for 100-year multiannual summer means. These are FAMOUS UM atmosphere climatological means of the quantities and runs shown in the paper.
The experiments are as follows (see also notes below the table):
| runid | albedo | scenario | AOGCM | shape | T |
| jaaac | medium | rcp85 | CanESM2 | E | 4.24 |
| jaaad | medium | rcp85 | NorESM1-M | Ew | 2.64 |
| jaaae | low | rcp85 | NorESM1-M | Ew | 2.64 |
| jaaag | low | abrupt4xCO2 | CanESM2 | E | 4.83 |
| jaaai | low | abrupt4xCO2 | HadGEM2-ES | E | 5.27 |
| jaaak | low | rcp45 | MIROC5 | EWs | 1.85 |
| jaaal | high | rcp45 | CanESM2 | EWNS | 2.13 |
| jaaam | low | rcp45 | CanESM2 | Es | 2.18 |
| jaaan | medium | rcp45 | CanESM2 | EWNS | 2.15 |
| jaaao | low | rcp45 | HadGEM2-ES | EW | 2.23 |
| jaaar | medium | rcp45 | HadGEM2-ES | EW | 2.22 |
| jaaas | medium | rcp45 | NorESM1-M | EW | 1.11 |
| jaaat | high | rcp45 | HadGEM2-ES | EWN | 2.21 |
| jaaau | high | rcp45 | MIROC5 | EWNS | 1.86 |
| jaaav | high | rcp85 | CanESM2 | E | 4.22 |
| jaaaw | medium | rcp26 | MIROC5 | EWNS | 1.08 |
| jaaax | medium | rcp26 | CanESM2 | EWNS | 1.25 |
| jaaay | medium | rcp26 | NorESM1-M | EWN | 0.31 |
| jaaaz | medium | rcp26 | HadGEM2-ES | EWN | 1.10 |
| jaaba | high | rcp26 | MIROC5 | EWNS | 1.05 |
| jaabb | high | rcp26 | CanESM2 | EWNS | 1.26 |
| jaabc | high | rcp26 | NorESM1-M | EWN | 0.31 |
| jaabd | high | rcp26 | HadGEM2-ES | EWNs | 1.05 |
| jaabe | low | rcp26 | MIROC5 | EWS | 1.06 |
| jaabf | low | rcp26 | CanESM2 | EWNS | 1.26 |
| jaabg | low | rcp26 | NorESM1-M | EWN | 0.31 |
| jaabh | low | rcp26 | HadGEM2-ES | EWN | |
| jaabj | medium | historical | CanESM2 | EWNS | -0.20 |
| jaabk | medium | historical | NorESM1-M | EWNS | -0.49 |
| jaabl | medium | historical | HadGEM2-ES | EWNS | -0.32 |
| jaabm | low | historical | CanESM2 | EWNS | -0.16 |
| jaabn | low | historical | NorESM1-M | EWNS | -0.51 |
| jaabo | low | historical | HadGEM2-ES | EWNS | -0.33 |
| jaabp | high | historical | CanESM2 | EWNS | -0.20 |
| jaabq | high | historical | NorESM1-M | EWNS | -0.50 |
| jaabr | high | historical | HadGEM2-ES | EWNS | -0.32 |
| jaabs | low | rcp45 | NorESM1-M | EW | 1.08 |
| jaabt | high | rcp85 | NorESM1-M | Ew | 2.64 |
| jaabu | low | rcp85 | CanESM2 | E | 4.23 |
| jaabz | medium | historical | MIROC5 | EWNS | 0.00 |
| jaacb | low | recovery | E | ||
| jaacc | medium | recovery | EWNS | ||
| jaacd | low | recovery | EW | ||
| jaace | medium | recovery | EWS | ||
| scaa1 | medium | recovery | EW | ||
| scaa2 | medium | recovery | EWS | ||
| scaa3 | medium | recovery | EW | ||
| scaa4 | medium | recovery | EWNS | ||
| scaa8 | medium | recovery | EWNS | ||
| sgfj9 | high | historical | MIROC5 | EWNS | 0.00 |
| sgfja | low | historical | MIROC5 | EWNS | 0.00 |
| sgfjb | medium | historical | MIROC5 | EWNS | 0.00 |
| sgfjc | high | rcp85 | MIROC5 | E | 3.53 |
| sgfjd | low | rcp85 | MIROC5 | E | 3.59 |
| sgfje | medium | rcp85 | MIROC5 | E | 3.58 |
| sgfjg | medium | rcp45 | MIROC5 | EWs | 1.86 |
| sgfjr | low | recovery | E | ||
| sgfjs | low | recovery | E | ||
| sgfjt | low | recovery | E | ||
| sgfjv | low | recovery | EWN | ||
| sgfjw | low | recovery | EWNS | ||
| sgfjx | low | recovery | EWN | ||
| sgfjy | low | recovery | EW | ||
| sgfxt | high | recovery | EWNS | ||
| sgof1_o | The uncoupled Glimmer experiment using the initial climate of jaaai | ||||
The experiments with "historical" or "rcp??" in the scenario column have a declining ice sheet (Section 3 of the paper) with a climate from the AOGCM named, and those with "recovery" have a regrowing ice sheet under the MIROC5 historical climate (Section 4). All but two of the recovery experiments are initialised from states of jaaai and jaaac (the states marked with small circles in Figure 4b). The two exceptions are jaacd and jaace (the dashed lines in Figure 4c), which are initialised from the final steady states of jaaak and sgfjg respectively (the states marked with large circles in Figure 4b).
The shape column is the configuration of the final steady state (as described in Section 3.4).
T is the difference of the global mean surface air temperature in kelvin in FAMOUS between this climate and the MIROC5 historical climate with the same albedo.