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We present the first demonstration of the FengYun-3E (FY3E) GNOS-R (GNSS occultation sounder II-Reflectometry) payload&#x0027;s capacity to detect near-surface soil freeze/thaw (F/T) states. This study offers an initial analysis of the F/T retrieval algorithm applied to data collected from the Arctic Circle, underscoring the GNOS-R&#x0027;s potential to deliver long-term near-surface soil F/T products. Data for the period extending from the launch day of GNOS-R (Day of Year, DOY 179, 2021) to DOY 270&#x00A0;in 2022 were analyzed using the surface reflectivity (SR) ratio factor to discriminate F/T variations. Comparisons were made with soil moisture active passive (SMAP) F/T products, serving as an auxiliary analysis. We found a strong consistency between SR ratio factor and SMAP F/T values, with the accuracy of the F/T retrieval algorithm exceeding 60&#x0025;. These findings corroborate the efficacy of the GNOS-R payload aboard FY3E in monitoring F/T patterns at higher latitudes, specifically, the Arctic Circle. The outcomes of this study will be beneficial for future F/T detection efforts using space-borne GNSS-R (Global Navigation Satellite-Reflectometry) payloads.

Assessing the Freeze/Thaw States in Arctic Circle Using FengYun-3E GNOS-R: An Initial Demonstration and Analysis