An Algorithm for Sea Surface Wind Speed from SAC-D/Aquarius Microwave Radiometer (MWR)
[17-Nov-2015] Tauro, C.B., Hejazin, Y., Jacob, M.M., and Jones, L. .
Presented at the 2015 Aquarius/SAC-D Science Team Meeting
The CONAE MWR team in collaboration with CFRSL has developed an improved algorithm for retrieving ocean wind speeds using the newest MWR V7.0 brightness temperature data. The previous model used a linear regression to translate the MWR brightness temperature at 37 GHz vertical and horizontal polarizations to match WindSat brightness temperature at a 53Â° incidence angle. In contrast, the new model uses empirical coefficients derived using MWR brightness temperature at 36.5 GHz H- and V-pol with collocated oceanic and atmospheric environmental parameters from numerical weather prediction (NWP) models. Unlike the previous algorithm, this version makes a wind direction correction to the surface brightness temperature before retrieving atmospheric transmissivity and the isotropic ocean surface wind speed at 10 m height, and has two different sets of coefficients for each incidence angle. In addition, comprehensive on-orbit validation was conducted using MWR wind speed measurements with collocated satellite ocean wind speed retrievals. In this presentation the algorithm bases are presented, as well as a summary of validation results.