John E. Tyler 



Visibility Laboratory 



Scripps Institution of Oceanography 



Our group has been actively engaged in making measurements of spectral 

 irradiance underwater for the last three or four years. We have accumu- 

 lated a considerable body of data not only on radiometric data but also 

 on other oceanic variables such as: chlorophyll concentration, primary 

 productivity, total particulate matter, temperature profile and trans- 

 mittance. 



We are interested in both biological and physical aspects of radiant 

 energy in the sea. Our data give the energy available for photosynthesis. 

 At the same time our data quantitatively specify the optical signature 

 available underwater for the detection of surface chlorophyll from above 

 the water. 



We now have pending two major publications; viz., a report on the 

 results of an expedition conducted by S.C.O.R. Working Group 15, which 

 will be published by The Office of Oceanography, UNESCO, Place de Fontenoy, 

 Paris 7^5 France, and a monograph entitled "Measurements of Spectral Irra- 

 diance Underwater" to be published by Gordon and Breach Science Publishers, 

 150 Fifth Avenue, New York, New York 10011. 



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