Radiometer studies of low-salinity sea ice View Full Text


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Article Info

DATE

1978-01

AUTHORS

Martti Tiuri, Martti Hallikainen, Antti Lääperi

ABSTRACT

Theoretical and experimental studies of ultra-high-frequency (UHF) and microwave radiometry to sense remotely the thickness and other characteristics of low-salinity (less than one per mille) sea ice are described. The experimental studies used a 600-MHz and a multichannel, multibeam, 4.7-GHz radiometer carried by a helicopter to measure the brightness temperature of different types of sea ice in the Gulf of Bothnia in 1975 and 1976. The developed theory and experiments show that the brightness temperature of low-salinity sea ice oscillates as a function of ice thickness at UHF frequencies. Due to higher attenuation, the oscillations quickly die away at 4.7 GHz and the brightness temperature reaches an almost constant value when the thickness exceeds a few decimetres. By using a three-channel UHF radiometer with suitably selected center frequencies, the oscillations can be reduced and the effective brightness temperature will grow more linearly with the ice thickness. Experiments show that ice ridges appear as thick ice at 600 MHz and as thinner ice at 4.7 GHz, thus allowing them to be detected by radio techniques. More... »

PAGES

361-371

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00913882

DOI

http://dx.doi.org/10.1007/bf00913882

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1005971079


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