The effect of monomolecular surface films on the microwave brightness temperature of the sea surface

Autor:	William D. Garrett, Heinrich Hühnerfuss, Werner Alpers, Hans-Juergen C. Blume
Rok vydání:	1982
Předmět:	Materials science business.industry Wind stress Dielectric Oleyl alcohol Molecular physics Wavelength chemistry.chemical_compound Optics chemistry Surface wave Brightness temperature Emissivity General Earth and Planetary Sciences business Microwave
Zdroj:	International Journal of Remote Sensing. 3:457-474
ISSN:	1366-5901 0143-1161
DOI:	10.1080/01431168208948415
Popis:	It is pointed out that monomolecular surface films of biological origin are often encountered on the ocean surface, especially in coastal regions. The thicknesses of the monomolecular films are of the order of 3 x 10 to the -9th m. Huehnerfuss et al. (1978, 1981) have shown that monomolecular surface films damp surface waves quite strongly in the centimeter to decimeter wavelength regime. Other effects caused by films are related to the reduction of the gas exchange at the air-sea interface and the decrease of the wind stress. The present investigation is concerned with experiments which reveal an unexpectedly large response of the microwave brightness temperature to a monomolecular oleyl alcohol slick at 1.43 GHz. Brightness temperature is a function of the complex dielectric constant of thy upper layer of the ocean. During six overflights over an ocean area covered with an artificial monomolecular alcohol film, a large decrease of the brightness temperature at the L-band was measured, while at the S-band almost no decrease was observed.
Databáze:	OpenAIRE
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