The amount of organic phosphorus in the water at Station 8 was low at 

 all levels and throughout the year. In only two cases was the concentration 

 of organic phosphorus greater than 0.3 ug-at/L and usually it was not more 

 than 0,1 or 0»2 ;ug»at/L. 



The vertical distribution of organic phosphorus was very erratic. In 

 June 1950 there was a relatively high value at the surface. In general 

 there were extremely low values in the upper 80 meters, the layer in which 

 the content of inorganic --hosphorus was low. Higher values of organic phos- 

 phorus were occasionally found at this level and at greater depths. There 

 was usually no organic phosphorus near the bottom at this station but in three 

 instances a small amount was observed at the deepest level sampled, 183 meters. 



Phosphorus Sections 



The sections (figs. 6 and 7) show the phosphorus distribution along 

 the original series of stations from month to month throughout the 16-month 

 period of survey. 



In the following discussion the phosphorus distribution will be related 

 to the thermal structure of the water. The temperature data are not reported 

 in this paper but some general aspects of the temperature distribution will 

 be discussed as it relates to phosphorus. 



The sections show two places of moderate phosphorus concentration: 

 the inshore water, and the deep water at Station 8. The upper £0 meters 

 from Station 5> outward was generally almost devoid of ohosphorus, that is, 

 values of total phosphorus were less than 0.25 ^ug-at/L. 



In May V)\\9 when the summer thermal stratification of the water was 

 just beginning, the phosphorus content of the upper layers was a little 

 above normal. This condition remained throughout June and July as the 

 thermal stratification became fully developed. 



In early September the stratification of the water continued but 

 wind stirring had extended to 20 meters. The phosphorus content was low 

 from Station 5 outward and to a depth of 60 meters. The high values at 

 Station h are discussed above. 



In October the thermal structure in the upper levels was about the 

 same as in September except surface cooling had started and uniform 

 temperatures extended to 30 meters. The phosphorus content was low at 

 those levels as in September. In the deeper water, however, the isotherms 

 indicated a movement of water along the bottom toward shore resulting in a 

 displacement of water upward. This was reflected in higher phosphorus con- 

 tent below 60 meters at Station 7. There is indication that the effect 

 of this movement extended as far as Station 6 where the value at the bot- 

 tom was unusually high. It should be noted, however, that the mean concen- 



36 



