Experimental Results of the Remote Sensing of Sea-Surface Salinity at 21-cm Wavelength
- 1 July 1976
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Geoscience Electronics
- Vol. 14 (3) , 198-214
- https://doi.org/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.Keywords
This publication has 3 references indexed in Scilit:
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- Equations for Calculating the Dielectric Constant of Saline Water (Correspondence)IEEE Transactions on Microwave Theory and Techniques, 1971
- An airborne measurement of the salinity variations of the Mississippi River OutflowJournal of Geophysical Research, 1970