DOI: 10.5281/zenodo.7334047
title: Data set: Yearly RACMO2.3p2 variables, threshold temperature and Sentinel-2 melt pond volume

description: Data set of yearly regional atmospheric climate model RACMO2.3p2 data over Antarctica. At the lateral and ocean boundaries the model is forced by ERA5 reanalysis data every 6 hours from 1979-2021. The model is run at 27 km horizontal resolution for the entire Antarctic ice sheet, which constitutes an update of the simulation forced from 1979-2018 by ERA-Interim reported in van Wessem et al., 2018. Upper air relaxation is also active.<br> To simulate the recent past (1950-2014) and the future (2015-2100) we use RACMO2.3p2 at 27 km resolution to dynamically downscale one historical and three future projections emission scenarios (SSP1-2.6, SSP2-4.5 and SSP5-8.5) of the Coupled Model Intercomparison Project Phase 6 (CMIP6). Detailed CESM2 description and latest updates are provided in Danabasoglu et., al 2020 and an evaluation over Greenland in Van Kampenhout et al., 2020. These data are then used to fit exponential and power-law relations of annual total liquid water production (melt + rain) and snow accumulation (snowfall - sublimation) to calculate MoA sensitivity as a function of annual average 2 m temperature. A comparison with Sentinel-2 melt pond observations can then be performed. <strong>Data set includes: </strong> <strong>RACMO2.3p2-ERA5-3H</strong> - Yearly average precipitation, snowfall, snowmelt and sublimation for the period 1979-2021 in mm w.e per year, and yearly average 2 m temperature in K, forced by 3 hourly ERA5 reanalysis data. <strong>RACMO2.3p2-hist_r567</strong> - Yearly average precipitation, snowfall, snowmelt and sublimation for the period 1950-2014 in mm w.e per year, and yearly average 2 m temperature in K, forced by 6 hourly CESM2 historical data. <strong>RACMO2.3p2-SSP''126,245,585''_r567</strong> - Yearly average precipitation, snowfall, snowmelt and sublimation for the period 2015-2100 in mm w.e per year, and yearly average 2 m temperature in K, forced by 6 hourly CESM2 future scenario (SSP1-2.6, SSP2-4.5, SSP5-8.5) data. <strong>TT_ALL.nc </strong>- Antarctic threshold temperature \(T_T\) for MoA = 0.7 as described in the Methods section. <strong>dT_ALL.nc </strong>- Uncertainty in Antarctic threshold temperature \(T_T\) for MoA = 0.7 as described in the Methods section. <strong>TT_IS.nc </strong>- Antarctic threshold temperature \(T_T\) for MoA = 0.7 of 56 selected ice shelves as described in the Methods section. <strong>dT_IS.nc </strong>- Uncertainty in Antarctic threshold temperature \(T_T\) for MoA = 0.7 of 56 selected ice shelves as described in the Methods section. <strong>S2_meltpondvolume_v3.nc</strong> - Sentinel-2 melt pond volume as described in the Methods section. <strong>Height_latlon_ANT27.nc </strong>- Grids of latitude, longitude, surface elevation (height), land/ice mask (mask2d), grounded land/ice mask (maskgrounded2d), aspect ratio, and surface slope.
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