Experimental results of the remote sensing of sea-surface salinity at 21-cm wavelength

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Issue Date
1976-07-01
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Authors
Thomann, Gary C.
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Citation

Thomann, G.C.; , "Experimental Results of the Remote Sensing of Sea-Surface Salinity at 21-cm Wavelength," Geoscience Electronics, IEEE Transactions on , vol.14, no.3, pp.198-214, July 1976 doi: 10.1109/TGE.1976.294450

Abstract

The complex dielectric constant of sea water is a function of salinity at 21-cm wavelength, and sea-water salinity can be determined by a measurement of radiometric temperature at 21 cm along with a measurement of thermodynamic temperature. Three aircraft and two helicopter experiments using two different 21-cm radiometers were conducted under different salinity and temperature conditions. Ground-truth measurements were used to calibrate the data in each experiment. RMS deviations of between 2 and 3%0 were found between remote and ground-truth boat measurements. Part of this deviation is attributed to position mislocation between the aircraft and boats. It is inferred from these experiments that accuracies of 1 to 2%o are possible with a single surface calibration point necessary only every two hours if the following conditions are met-water temperatures about 20°C, salinities above 10%0, level aircraft flight, and extreme care near land masses.

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