Computation
Computation for ESA Sea Ice Climate Change Initiative (Sea_Ice_cci): Retrieval of sea-ice thickness from Sentinel-3B radar altimetry data
Abstract
The method used to extract sea-ice thickness from radar altimetry data is based on the
pioneering work of Peacock and Laxon, 2004; Laxon et al., 2003 for the ERS-2 mission. The
method involves separating the radar echoes returning from the ice floes from those
returning from the sea surface in the leads between the floes. This step of a surface-type
classification is crucial and allows for a separate determination of the ice floe and
sea-surface heights. The freeboard that is the elevation of the ice upper side (or ice/snow
interface) above the sea level can then be computed by deducting the interpolated
sea-surface height at the floe location from the height of the floe. Sea-ice thickness can then
be calculated from the sea-ice freeboard with the additional information of the snow load.
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