Table 1 .--Continued 



STATION 20 



SPENCER F. BAIRD; November 30, 1958; 1953, 2013 G.o.t. (zone +6, 1353, 1413); 15°07'N., 96°55.5'W.; sounding, 

 2090 fm.; wind, 060°, force 3; temp., 85.8°F. dry, 79.2°F. wet; weather, partly cloudy; sea, moderate; wire angle 

 40°, 05°; a > BT slide No. 20. 



Incident solar radiation: daily T 381 g.-cal. /cm. . 



Submarine irradiance and attenuation coefficients at 1235-1305 hr.: 



Wire Angle Wire Out Corrected Output Photometer Depth Depth Interval Attenuation Coefficient 



of Detector 

 m. ua. m. m. k 



10 



79.5 

 18.1 

 3.0 



10 



10-20 

 20-30 



0.148 

 0.180 



Phytoplankton: 



Depth 



50 

 75 

 100 

 150 

 200 



Chlorophyll a 



mg./m. 3 



Biological Data 



Photosynthesis 



Lab. Incubator 



mg. C/m. 3 /hr. 



at ip00 ft .-candles 



Light 



Dark 



Deck Incubator 

 mg. C/m. 3 /day 

 Light Dark 



38.4 



9.01 



Phytoplankton haul taken. 



a) Vessel steamed while on station. 



b) Duplicate values: 30 m., 0.46; 200, 2.6; 574, 3.6 u.g. at./l. 



