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Quality assessment of surface temperature reproduction by a model archive, the COSMO-CLM Russian Arctic hindcast, based on station data

The COSMO-CLM Russian Arctic hindcast data are compared with station data on monthly and long-term timescales using surface air temperature data at 146 weather stations in the study region. Some of the climatological ETCDDI indices are calculated, and the quality of the model archive reproduction of mean and extreme 2 m temperatures is evaluated. Generally, the hindcast succeeds in reproducing the thermal regime of the Arctic. The existing errors are caused by the large distances of the nearest model grid points from a station and the inaccuracies in the coastline or surface elevation description. The model underestimates the mean monthly temperatures by one degree on the average. The hindcast shows a tendency to underestimate the temperatures in the western part of the region, which has a mild climate, and to overestimate the low temperatures in the severe climate regions.