This study assesses the feasibility of radar-based remote sensing of barometric pressure of the air at the sea surface. Currently, sea surface barometric pressure measurements can only be obtained from in situ observations including buoy and dropsonde measurements, which are sparse in spatial coverage and expensive to implement. There are no operational remote sensing methods available even in experimental stages. The proposed technology is to use differential absorption radar working at the 50-56 GHz O2 bands to fill the observational gap. The numerical simulation results for homogeneous sea surface backgrounds show that with an airborne radar working at these O2 absorption bands, the rms errors of the instantaneous radar surface pressure estimates with 15 dB signal-to-noise ratios can be as low as 4–7 mb. With multiple measurements over an area about 10 km the uncertainty in radar sea surface pressure estimates would drop to about 1 mb which is similar to conventional in situ buoy measurements. A radar system that covers the O2 absorption wavelengths over the ocean will have great potential for weather observations and other meteorologica
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