Retrieval of Sea Surface and Sea-ice Parameters in the Arctic Ocean from Satellite Radar Altimetry with Ocean/Sea-ice Processing Continuity
Abstract
Satellite altimetry was initially designed for observing the open ocean, however efforts to retrieve sea surface topography in ice covered areas and sea ice parameters in the Arctic Ocean have a long history (e.g. Peacock, 2004).
The majority of current Arctic processing relies on using different retracking algorithms for open ocean and ice covered areas, thus empirical bias corrections between open ocean and ice-covered areas are needed, and are still an open issue. However recent advances in waveform processing allow for a processing continuity from open ocean to ice covered areas, and the retrieval of ocean and sea-ice topography from the same retracking algorithm, which uses a physical echo shape model able to fit ocean waveforms as well as lead waveforms (Poisson et al., 2018). This new physical retracking approach was applied on SARAL/AltiKa and Envisat high rate data to produce a sea surface height and sea ice freeboard dataset. Validation results suggest that this new method performs well compared to existing products and in-situ data, and that large scale ocean circulation and sea-ice features are consistently observed. In this talk, we will present the processing scheme used to derive SARAL/AltiKa and Envisat datasets, from waveform retracking to the final gridded product, as well as validation results. Future challenges for ice covered areas include the development of a true multi-mission combination system, tailored to the area, to try to resolve small-scale features. This approach will be used to produce future CMEMS Arctic sea level products.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.C13B1151P
- Keywords:
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- 0726 Ice sheets;
- CRYOSPHEREDE: 0728 Ice shelves;
- CRYOSPHEREDE: 0750 Sea ice;
- CRYOSPHEREDE: 0758 Remote sensing;
- CRYOSPHERE