Evolution of precipitations and snow depth over the Arctic sea ice modeled by the regional climate model MAR

The Arctic is experiencing changes in precipitation, both in terms of amount and phase, due to rising temperatures. Key mechanisms contributing to these changes include increased poleward moisture transport and higher ocean evaporation resulting from the shrinking sea ice cover. In autumn, changes in precipitation over the sea ice can influence its growth by altering the insulation between the ocean and the atmosphere. A reduction in snow cover (which has lower insulating properties) enables the ocean to cool faster by releasing heat into the atmosphere, thus promoting sea ice growth. In spring, variations in snowfall and rainfall can affect the sea ice albedo, influencing its melting rate. Using the regional climate model MAR, which includes a complex snow scheme, we examine trends in precipitation and snow depth over the Arctic sea ice during the growth season. We also conduct sensitivity tests to assess the response of snow depth to changes in sea ice thickness.