Potential of satellite‐based land emissivity estimates for the detection of high‐latitude freeze and thaw states Geophysical Research Letters

Reliable detection of freeze and thaw (FT) states is crucial for the terrestrial water cycle, biogeochemical transitions, carbon and methane feedback to the atmosphere, and for the surface energy budget and its associated impacts on the global climate system. This paper is novel in that for the first time a unique approach to examine the potential of passive microwave remotely sensed land emissivity and itsadded values of being free from the atmospheric effects and being sensitive to surface characteristics is being applied to the detection of FT states for latitudes north of 35°N. Since accurate characterizations of the soil state are highly dependent on land cover types, a novel threshold-based approach speci fic to different land cover types is proposed for daily FT detection from the use of 3 years (August 2012 to July 2015) of