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Science 20 February 1970:
Vol. 167. no. 3921, pp. 1119 - 1121
DOI: 10.1126/science.167.3921.1119
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Articles

Spectra of Backscattered Light from the Sea Obtained from Aircraft as a Measure of Chlorophyll Concentration

George L. Clarke 1, Gifford C. Ewing 1, and Carl J. Lorenzen 1

1 Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 20543

Spectra of sun and skylight backscattered from the sea were obtained from a low-flying aircraft and were compared with measurements of chlorophyll concentration made from shipboard at the same localities and at nearly the same times. Increasing amounts of chlorophyll were found to be associated with a relative decrease in the blue portion of the spectra and an increase in the green. Anomalies in the spectra show that factors other than chlorophyll also affect the water color in some instances; these factors include other biochromes, suspended sediment, surface reflection, polarization, and air light.


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