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. Sea ice volume export through the Fram Strait represents animportant freshwater input to the North Atlantic, which could in turnmodulate the intensity of the thermohaline circulation. It also contributessignificantly to variations in Arctic ice mass balance. We present the firstestimates of winter sea ice volume export through the Fram Strait usingCryoSat-2 sea ice thickness retrievals and three different ice drift productsfor the years 2010 to 2017. The monthly export varies between −21 and −540  km 3 . We find that ice drift variability is the main driver ofannual and interannual ice volume export variability and that theinterannual variations in the ice drift are driven by large-scale variabilityin the atmospheric circulation captured by the Arctic Oscillation and NorthAtlantic Oscillation indices. On shorter timescale, however, the seasonalcycle is also driven by the mean thickness of exported sea ice, typicallypeaking in March. Considering Arctic winter multi-year ice volume changes,54  % of their variability can be explained by the variations in icevolume export through the Fram Strait.

Satellite-derived sea ice export and its impact on Arctic ice mass balance