Ambrose LJRhtship (fig. 11, table 11)-- 

 The presence of a slight and sonnewhat con- 

 fused vertical temperature structure from 

 January through March was also seen at this 

 station during 1957-59, though not in 1956. 

 During this season other stations show nearly 

 isothermal conditions. The difference at 

 Ambrose Lightship no doubt reflects variations 



in the amount of runoff from the Hudson 

 River; such variations are clearly shown in 

 the surface salinity values. The June data 

 were lost when the Relief Lightship was 

 rammed and sunk, and bathythermograph fail- 

 ure resulted in the loss of bottom observations 

 during late summer and fall. 



Ui 



80 



70 



60 



50 



40 



SURFACE T °F 



30 L 



Uj 



It 



Q 



100 



n 1 

 nil 



^--^l' 'MM 



1/ Ml \ I 



24.0 



BOTTOM S.% 



SURFACE S.%< 



_i_ 



JAN. FEB. MAR. APR. MAY 



JUN. JUL. AUG. SEP. OCT NOV. DEC. 



Figure 11.— Ambrose Lightship. (Dashed line in upper diagram mean lor period 1950-59.) 



26 



