

I see no evidence of chlorophyl]. . Perhaps, if upwell ing 

 irradiance v;ere subtracted from the reflected light from the 



o 



surface of the water, the 6750 A absorption would "e seen. 



14. The structural content in the Under Water data 

 compare almost identically (compare 19, 23, and 24). 



15. Irradiance has very slight variation in these 



Under Water data. The peak value changes from 36 to 52 p 



, 2 

 watts/cm i-i for these spectra. i would expect a greater 



variation since the cloud cover changed over the time period 



from 1:15 to 1:45. Perhaps, we were inadvertently "shadowing" 



the water thus negating cloud cover changes. 



16. The Under Water spectra have a definite "peak" 



o 



at about 51C: A (compare 19, 23 and 24) . 



17. I doubt if the irradiance values measured are 



3 

 truly upv^elling. Tyler obtained a value of about 3 x 10 \i. watts/ 



2 



cm [i for zero depth upwelling irradiance at Crater Lake v;hi le 



2 ° 



we obtained about 45 \x v;atts/cm \x on 19, 2 3 and 24 at 5000 A. 



Either the ocean u.pv;elling irradiance is lower by a factor of 

 50 or we were indeed, shadov;ing the irradiance (see Statement 

 15) . 



18. There is a definite strong absorption evident 



in the Under VJater datfi that sets in near 5500 A and attenuates 



o 



the irradiance froiv; 6000-7 000 A. 



29-7 



