Sea Ice Detection with FY3E GNOS II GNSS Reflectometry

The FY-3E GNOS II GNSS Reflectometry is focus on sea surface wind speed retrieval. Data affected by sea ice should be removed, the monthly averaged sea ice coverage dataset was used to generate the sea ice look-up table. However, the sea ice coverage is constantly changing, a better alternative is to distinguish between sea ice and open water with real-time observed delay-doppler maps. In this paper, we mainly discussed the sea ice detection with GNSS-R signals from spaceborne GNOS II GNSS-R reflectometry. Several parameters derived from delay-doppler maps were analyzed and related to the sea ice concentration. The sea ice coverage was obtained by determining the threshold and weight of the parameters. Comparison of GNOS II sea ice coverage retrieval results with the OSI SAF sea ice concentration data showed good consistence. Analysis showed that the algorithm provides an accurate estimate of sea ice coverage in real time.