6 - 



>- 

 i 



£ 2- 



0900 



4 - 



1200 



1500 



1800 



2100 



2400 



TIME 



0300 



0600 0800 



DECEMBER 29, 1971 



DECEMBER 30, 1971 



Figure 7.- Chlorophyll a in vivo concentrations determined 

 by single-wavelength laser system from Thimble Shoals 

 Channel Pier of Chesapeake Bay Bridge Tunnel and 

 normalized to in situ measurements at 2000 EST on 

 December 29, 1971. (From ref. 11.) 



id 6 



MIDLAKE TRANSECT OF LAKE ONTARIO 

 5 OCTOBER 1972 



_L 



_L 



_L 



10 20 30 40 50 



FLIGHT DISTANCE, km 



60 



70 



Figure 8.- Chlorophyll a in vivo concentrations measured 

 by airborne laser fluorosensor system which was flown 

 from west of Rochester, New York, to Canadian shore. 

 (Adapted from ref. 12.) 



35 



