A special radiometer has been constructed to perform aerial measurements of ocean color in order to obtain the chlorophyll content of ocean water. This radiometer measures the spectral albedo at four wavelengths (466, 525, 550 and 600 nm) and was used during fourteen flights over the Gulf of Guinea in June and July of 1975. All measurements were performed from 150 m altitude. The acquisition of measurements independent of cloud cover was made possible by the calculation of differences between albedos at different wavelengths. Differences between albedos were mapped after each flight, and showed the detailed structure of a thermal front due to coastal upwellings. A theoretical interpretation, based on computations of radiative transfer in the ocean, shows that the difference of albedos at 466 and 525 nm is very sensitive to chlorophyll content, whereas the difference of albedos at 550 and 600 nm is sensitive to the presence of light scattering particles.
Airborne remote sensing of chlorophyll content under cloudy sky as applied to the tropical waters in the Gulf of Guinea
Luft-Fernabtastung des Chlorophyllgehalts in den tropischen Gewaessern im Golf von Genua bei bewoelktem Himmel
Remote Sensing of Environment ; 7 , 3 ; 235-248
1978
14 Seiten, 26 Quellen
Aufsatz (Zeitschrift)
Englisch