Validation of phase transition water content in freeze-thaw process at pixel-scale using field measurements

Phase transition water content (PTWC) is an important indicator of the intensity of soil freezing-thawing and is the crucial parameter that influences land surface energy balancing. In this paper, a PTWC retrieval algorithm was used to estimate the PTWC of pixel-scale. Through the field experiment at North China Plain, the actual PTWC is obtained to evaluate the accuracy of inversion. The validation result showed that the algorithm based on AMSR-E can provide reliable values of PTWC in pixel-scale. The RMSE of all sampling points is 0.008v/v.