Towards Including Dynamic Vegetation Parameters in the EUMETSAT H SAF ASCAT Soil Moisture Products

The TU Wien Soil Moisture Retrieval (TUW SMR) approach is used to produce several operational soil moisture products from the Advanced Scatterometer (ASCAT) on Metop series of satellites as part EUMETSAT Satellite Application Facility Support Operational Hydrology and Water Management (H SAF). incidence angle dependence backscatter described by a second-order Taylor polynomial, coefficients which are normalize ASCAT observations reference 40∘ for correcting vegetation effects. Recently, kernel smoother was developed estimate dynamically, in order account interannual variability. In this study, we estimating these coefficients, where distinguished first time between their two uses, meaning that short fixed window width normalisation while tested different widths optimizing correction. particular, investigated impact using dynamic parameters retrieval. We compared retrievals based those estimated current examining agreement, terms Pearson correlation coefficient, unbiased RMSE bias with respect situ moisture. Data United States Climate Research Network were study influence climate class land cover type performance. sensitivity half-width also investigated. Results show can yield an improvement when there variability due trend or change amplitude timing seasonal cycle. However, introduces high-frequency parameters, particularly shorter half-widths.