First spaceborne phase altimetry over sea ice using TechDemoSat‐1 GNSS‐R signals
2017; American Geophysical Union; Volume: 44; Issue: 16 Linguagem: Inglês
10.1002/2017gl074513
ISSN1944-8007
AutoresWeiqiang Li, Estel Cardellach, Fran Fabra, A. Rius, Serni Ribó, Manuel Martín‐Neira,
Tópico(s)Climate change and permafrost
ResumoAbstract A track of sea ice reflected Global Navigation Satellite System (GNSS) signal collected by the TechDemoSat‐1 mission is processed to perform phase altimetry over sea ice. High‐precision carrier phase measurements are extracted from coherent GNSS reflections at a high angle of elevation (>57°). The altimetric results show good consistency with a mean sea surface (MSS) model, and the root‐mean‐square difference is 4.7 cm with an along‐track sampling distance of ∼140 m and a spatial resolution of ∼400 m. The difference observed between the altimetric results and the MSS shows good correlation with the colocated sea ice thickness data from Soil Moisture and Ocean Salinity. This is consistent with the reflecting surface aligned with the bottom of the ice‐water interface, due to the penetration of the GNSS signal into the sea ice. Therefore, these high‐precision altimetric results have potential to be used for determination of sea ice thickness.
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