Abstract
Ocean surface current is an important variable for ocean dynamics, and it plays a key role in air-sea interactions, with gradients of currents creating much strong air-sea coupling. However, retrieving the magnitude of the surface current is still challenging, with accurate wind-wave induced Doppler shift estimates being the main challenge for separating ocean surface current from the total ocean Doppler shift. This separation requires information on wind vectors, wave spectra and forward models to be able to simulate the radar response to the ocean surface. In this study, we investigate the effects of different wave spectra on estimates of wind-wave induced Doppler shift based on a numerical Doppler model. Simulation results show that, this quantity is dependent on the wave spectra. We support the selection of the Apel spectrum by comparing empirical models at C and Ka-band (CDOP and KaDOP). The study also highlights the important effects of wave spectra selection in future satellite Doppler measurements of ocean surface currents, a variable considered important by the National Acadamies.
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