Savannah Lifihtship (Figure 18, Table 18) 



The minimuin of 45.5 F at the surface occurred in mid-February. This was 

 8° below the mean for that time. Warming was slow and temperatures were below 

 the mean until the end of May. Summer values were near noinnal, while those 

 for the autumn were in general above the mean. There was more persistent 

 thermal structure in 1958 than there had been in 1956 or 1957. From late April 

 through mid-August some stratification was apparent. That it was maintained 

 was in part caused by an intrusion of cool water of unknown origin along the 

 bottom during June, when surface temperatures remained static. 



From January through mid-June surface salinity was substantially lower 

 than it had been in 1956 or 1957. By the end of July salinity recovered and 

 ran close to the 1956 readings, averaging a little more than 35.00 /oo. In 

 1957 salinity had been lower during the second half of the year. 



FEB I MAR 



APR I MAY 



JUL I AUG 



OCT I 



DEC I 





eoV'/^ V^'^W'!' ' .'''"■'/' 80° \ '\ ', >83' 



;i:ii\\\v|;i-U>-'r\ .; >\ \ - 



; ;±;;k;^-\ ; 



80'! 



70? 



60? 



LD 



Figure 18. Savannah Lightship, 195S. (Dashed line in upper diagram, laean 

 for period 1947-1955) 



112 



