The Potential of GNSS-R for Freeze/Thaw Surface State Monitoring in the New Space Era

<em><strong>GNSS-R based F/T surface state maps over the Tibet Plateau, Andes Mountains, and Rocky Mountains covering two full F/T cycles 2019-2020:</strong> </em> <em><strong>(a) </strong>Number of frozen months during 2019</em> <em><strong>(b)</strong> number of thawed months during 2019</em> <em><strong>(c) </strong>number of frozen months during 2020</em> <em><strong>(d)</strong> number of thawed months during 2020</em> <em><strong>(e) </strong>difference of the number of frozen months between 2019 and 2020</em> <em><strong>(f) </strong>difference of the number of thawed months between 2019 and 2020</em> <em><strong>(g) </strong>number of frozen months during the 2019 freezing period (September to December)</em> <em><strong>(h) </strong>number of thawed months during the 2019 thawing period (January to June)</em> <em><strong>(i) </strong>number of frozen months during the 2020 freezing period (September to December)</em> <em><strong>(j)</strong> number of thawed months during the 2020 thawing period (January to June)</em> <em><strong>(k) </strong>difference of the number of frozen months between 2019 and 2020 during the freezing period (September to December)</em> <em><strong>(l) </strong>difference of the number of thawed months between 2019 and 2020 during the thawing period (January to June)</em>