ICESat-2 Satellite Altimetry Measurement of Ice Shelf Water influenced
Fast Ice in Terra Nova Bay
- Gemma Marie Brett,
- Natasha Blaize Gardiner,
- Wolfgang Rack
Natasha Blaize Gardiner
University of Canterbury, Antarctica New Zealand
Author ProfileAbstract
Coastal fast ice provides a protective barrier to continental land ice
and an important biological habitat. Antarctic fast ice extent has been
well quantified using satellite remote sensing but spaceborne
measurement of sea ice thickness remains challenging, especially near
the coast. Here, we present the first ICESat-2 laser altimeter fast ice
freeboard measurements and thickness retrievals in Antarctica. In north
Terra Nova Bay, ICESat-2 measured in situ validated fast ice freeboard
with high accuracy, detected higher freeboard of thicker Ice Shelf
Water-influenced fast ice with a sub-ice platelet layer beneath, and
distinguished smooth-thermodynamic and rough-dynamic fast ice
compositions. Estimates of sub-ice platelet layer thickness obtained by
comparing ICESat-2 ice thicknesses with projected fast ice thicknesses
and snow depths agreed with prior electromagnetic induction surveys.
ICESat-2 has significant potential for large-scale assessment of fast
ice thickness and for identifying regions of glacial meltwater outflow,
provided snow depth is constrained.22 May 2024Submitted to ESS Open Archive 28 May 2024Published in ESS Open Archive