Winter Quarter Lightship (fig. 15, table 15)-- 

 The surface water temperature regime at 

 Winter Quarter was similar to that at other 

 stations in that conditions were generally above 

 the mean except during March. July data 

 were lost owing to instrument failure, but the 

 inflection of the isotherms on either side of 

 the gap in the profile indicate that an in- 



trusion of cold bottom 'water probably occurred 

 during the month. The bottom temperature of 

 68.6° F. in late September is the highest 

 recorded in the 5 years of this program. 

 The surface salinity from mid- September 

 through mid-October was considerably lower 

 than in other years, while the depression in 

 mid-December has no precedent at this station. 





80 



70 



60 



50 



40 



SURFACE T. °E 



i i i 



\ 

 20h 



£• 40 



£ 60 

 Q 80 



100 



I f5' 



hi! I 



, I 

 ill 



I- I I 



ll 



l I 



>43° 



JAN. 



FEB. MAR. APR. 



MAY 



JUN. JUL. 



AUG. 



SEP. OCT. 



NOV. 



DEC. 



Figure 15.— Winter Quarter Lightship. (Dashed line in upper diagram mean for period 1925-40.) 



39 



