Session 9: Sea Ice - Algorithms & Methods  - Summary Remarks

S. L. Farrell, T. Markus

• Updated ICESat-2 (Release 007) will be available Spring 2025

ATL03 updates include DAC, ITRF2020, FES2014b

new signal classifications and quality flags

ATL07/10 updates including 10 m fixed segment length,

DDA bifurcate, lognormal fitting for pseudo-waveforms

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• New Sentinel-3 Freeboard product available for both poles (Aublanc et al., 2024) from LEGOS/CLS (Fleury, Piras)

Adds to / extends CryoSat-2 and ICESat-2 sea ice observational record.

Will increase # of observations, improving statistics and mean fields.

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• Differences between CryoSat-2 & ICESat-2 observations of sea ice floes and leads

Due to radiometric and geometric sampling differences

Differences in lead and floe fractions

Problems exist in both the central Arctic Ocean and in the C.A.A.

CryoSat-2 provides reliable, and improved, sea ice concentration estimates in the

Canadian Arctic Archipelago compared to PMR

• Large (m-scale) discrepancies between observations and models for sea ice

Models, in particular ECCO, overestimate freeboard/thickness, especially in multiyear sea ice

→ Community now actively exploring synergies across multiple missions for sea ice

- LandSat 8/9; Sentinel-2 ,-3; Sentinel; SWOT; Passive Microwave to provide 2-D context for 1-D altimeter profile data.

- Helpful for understanding how representative the 1-D CS2/IS2 profiles are; 2-D data can be used to bias correct 1-D data

Near-coincident CryoSat-2 and Landsat-8 over sea ice to detect leads and floes. Figure courtesy of Amy Swiggs, CPOM, Northumbria University, UK.

Session 9: Sea Ice - Algorithms & Methods  - Summary Remarks

Cryo2ice Symposium 2024