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This is an investigation to quantify the influence of the sub-ice plateletlayer on satellite measurements of total freeboard and their conversion tothickness of Antarctic sea ice. The sub-ice platelet layer forms as a resultof the seaward advection of supercooled ice shelf water from beneath iceshelves. This ice shelf water provides an oceanic heat sink promoting theformation of platelet crystals which accumulate at the sea ice–oceaninterface. The build-up of this porous layer increases sea ice freeboard,and if not accounted for, leads to overestimates of sea ice thickness fromsurface elevation measurements. In order to quantify this buoyant effect,the solid fraction of the sub-ice platelet layer must be estimated. Anextensive in situ data set measured in 2011 in McMurdo Sound in thesouthwestern Ross Sea is used to achieve this. We use drill-holemeasurements and the hydrostatic equilibrium assumption to estimate a meanvalue for the solid fraction of this sub-ice platelet layer of 0.16. This ishighly dependent upon the uncertainty in sea ice density. We test this valuewith independent Global Navigation Satellite System (GNSS) surface elevationdata to estimate sea ice thickness. We find that sea ice thickness can beoverestimated by up to 19%, with a mean deviation of 12% as a resultof the influence of the sub-ice platelet layer. It is concluded that within100 km of an ice shelf this influence might need to be considered whenundertaking sea ice thickness investigations using remote sensing surfaceelevation measurements

The sub-ice platelet layer and its influence on freeboard to thickness conversion of Antarctic sea ice