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

 The presence of a slight and somewhat 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. 



kl 

 Uj 



u. 



Uj 

 Q 



SURFACE T. °F 



\ 'WW 



\ i |in\\ 



\ \ 



\ \ 

 \ 

 \ 

 \ 



100 



BOTTOM S.% 



SURFACE S.%o 



JAN 



FEB. MAR. APR. 



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



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



26 



