QuickScat-SeaWinds scatterometer observations of sea ice types around Greenland

Rasmus Tage Tonboe

doi:10.1117/12.452766

14 January 2002 QuickScat-SeaWinds scatterometer observations of sea ice types around Greenland

Rasmus Tage Tonboe

Proceedings Volume 4544, Remote Sensing of the Ocean and Sea Ice 2001; (2002) https://doi.org/10.1117/12.452766
Event: International Symposium on Remote Sensing, 2001, Toulouse, France

Abstract

Space borne Ku-band pencil beam QuikScat-SeaWinds scatterometer dat over sea ice in Greenland waters are analyzed with the aid of co-located: 1) sea ice charts issued by the Greenland ice service 2) DMSP-SSM/I passive microwave data and 3) HIRLAM numerical weather model analysis data. Seasonal variations in backscatter signature between different sea ice types are analyzed. Ice parameters such as ice concentration and ice type are significant for the backscatter signature;. The role of wind roughening of open water areas in low concentration ice cover, which can easily be seen in SAR imagery, has ben investigated using a Ku-band wind-backscatter model and ice charts. It is found that in areas with low concentration ice cover there is still a strong correlation between the backscatter coefficient and the wind speed. Except for the cases of surface melt the variations in (sigma) ₀ of multi-year ice, north of Greenland are small. For first-year ice in Baffin Bay the variations in (sigma) ₀ are larger than for multi-year ice. Further the variations in air temperature shows a significant correlation to the variations in (sigma) ₀. Both the (sigma) ₀ of multi-year ice and first-year ice change dramatically at the onset of ice surface melt. Multi-year ice decease by approximately 7 dB and first-year ice increases by approximately 5 dB. The fine scale structure and composition of the ice cover can be resolved using Radarsat ScanSAR imagery. Cases of coincident Radarsat and QuikScat data are compared in connection with the first-year ice development in Baffin Bay. A mean backscatter signature is defined. Finally the results from this investigation are used for ice type classification.

Citation Download Citation

Rasmus Tage Tonboe "QuickScat-SeaWinds scatterometer observations of sea ice types around Greenland", Proc. SPIE 4544, Remote Sensing of the Ocean and Sea Ice 2001, (14 January 2002); https://doi.org/10.1117/12.452766

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