Modèle Atmosphérique Régional (MAR) version 3.12 regional climate model pseudo-global warming experiment output, 2000-2019, Greenland domain, 20 kilometer (km) horizontal resolution.

### Access

Data files can be accessed via: https://arcticdata.io/data/10.18739/A2TT4FV6W/

### Overview

The Modèle Atmosphérique Régional (MAR) regional climate model is fully coupled to the Soil Ice Snow Vegetation Atmosphere Transfer (SISVAT) one-dimensional surface-atmosphere energy and mass transfer scheme (Fettweis et al., 2005, 2020; Lefebre et al., 2005). SISVAT simulates meltwater production, percolation, refreeze, and the impact of snow metamorphism on albedo via a multilayered snowpack model, CROCUS (Brun et al., 1989; Brun et al., 1992). Through extensive verification, MAR has proved to be well-suited for analyses of Greenland Ice Sheet (GrIS) surface mass balance (SMB) (Fettweis et al., 2011; Fettweis et al., 2020; Lefebre et al. 2005; Mattingly et al. 2020). This dataset contains the results of a model experiment that utilized the pseudo-global warming method of dynamical downscaling in MAR version 3.12. It includes a control run, in which MARv3.12 was forced with European Centre for Medium-Range Weather Forecasts Reanalysis v5 (ERA5) global reanalysis to simulate the historical GrIS SMB from 2000 to 2019, and two pseudo-global warming simulations: PGW1, in which we estimate the impact of the change in the thermodynamic background state under anthropogenic warming to GrIS surface mass loss and PGW2 in which we isolate the influence of changing sea-surface conditions.The naming convention for each file is explained using the example below:

File name format: ICE_experiment_year_month_start day_end day of month.nc

Example: ICE_b03_2009_09_01_30.nc

experiment: specifies one of the following labels for each of the model experiments: "a02" indicates output from the PGW1 run, "b03" indicates PGW2 output, "c01" marks the 2000-2019 control run, and "c02" contains control data for a 1980-1989 reference period when the mass balance of the Greenland Ice Sheet was relatively stable.

year: indicates the model year

month: indicates the model month

start day and end day: indicate the first and last days of the model month