Abstract
The algorithm to retrieve wind speed in a wide swath from the normalized radar cross section (NRCS) was developed for the data of Dual Frequency Precipitation Radar (DPR) operating in scanning mode installed onboard a Global Precipitation Measurement (GPM) satellite. The data for Ku-band radar were used. Equivalent NRCS values at nadir were estimated in a wide swath under the geometrical optics approximation from off-nadir observations. Using these equivalent NRCS nadir values and the sea buoys data, the new parameterization of dependence between NRCS at nadir and the wind speed was obtained. The algorithm was validated using ASCAT (Advanced Scatterometer) data and revealed good accuracy. DPR data are promising for determining wind speed in coastal areas.
Highlights
Collection and analysis of the information on near-surface wind speeds are necessary for operational meteorology and the development of climate models
The algorithm for wind speed retrieval from Ku-band radar onboard a Global Precipitation Measurement (GPM) satellite was developed based on buoy data
The regression model suggested in this work is simpler than in the work [7], and can be applied for obtaining wind speed from altimeter normalized radar cross section (NRCS) with the corresponding coefficients
Summary
Collection and analysis of the information on near-surface wind speeds are necessary for operational meteorology and the development of climate models. The algorithms for wind speed retrieval at moderate incidence angles are based on empirical geophysical model functions, which connect NRCS, wind speed and wind direction [3]. Wind speed retrieval algorithms from PR and DPR data were developed in [18,19,20] The approach in this works implies the building of geophysical model functions for each incidence angle. Wind speed can be retrieved from the DPR nadir swath using the approaches for altimeter data processing. This is the key idea of the present paper. The method to retrieve NRCS at nadir in the DPR swath is given in the Appendix A, but the detailed procedure can be found in [17]
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