On Retrieval of the Atmospheric Boundary Layer Dynamic Parameters Based on Collocated Measurements of the SFMR and NOAA GPS Dropwindsondes in Hurricane

The possibility of reconstructing the dynamic parameters (surface wind speed, friction velocity and roughness height) of the atmospheric boundary layer in a hurricane based on wind speed profiling by GPS dropwindsondes and collocated data of the Stepped Frequency Microwave Radiometer (SFMR) is discussed. The parameters of the atmospheric boundary layer were obtained from the data of GPS dropwindsondes with the use of the self-similarity of the velocity profile in the atmospheric boundary layer, previously proposed and successfully tested in laboratory conditions. The preliminary results of data processing showed that at surface wind speeds exceeding 35 m/s, the friction velocity saturates and the surface drag coefficient decreases accordingly. Based on the comparison of the measured dynamic parameters and the surface emissivity, empirical equations are proposed, which take into account the discovered properties of the dynamic parameters of the atmospheric boundary layer and potentially can be used for remote diagnostics of the boundary layer parameters.