抄録
This study is concerned with optinal frequency estimation for microwave radiometric observation of sea surface wind from satellite. Estimation is made in terms of effects of some typical atmospheric substances on
(1) apparent wind speed sensitivity of the sea surface brightness temperature of both polarizations at satellite level at incidence angles 0, 10, 20, 30 and 40 degrees and
(2) sky brightness temperature at normal incidence, in frequency range from 1 to 40 GHz, incorporating their typical atmospheric models. Oxygen, water vapor, cloud water and rain are the typical atmospheric substances. Among them, rainfall has the greatest effect, and water vapor, cloud mater and oxygen follow. Microwave radiometry will be effective for sea surface wind observation even in the rainfall, however, at most up to the rainfall rate of 1-2 mm/hr, and the frequency range from 10-18 GHz will be the optimal one, 25-30, 30-40 and 5-10 GHz bands following. This order, of course, depends on the atmospheric conditions in the strict sense.
