Savannah lightship 



Siirface water temperatures at Savannah Lightship exliibited 

 little departure from the mean for the period of record except for a 

 warm Mardij slow April, cold last two-thirds of Movember and warm De- 

 cember , 



Minimum temperatiu^es of approximately U8°F apparently occurred 

 in January (Observations did not start at this station until 18 January) 

 and reached a maximum at the surface of less than S^'^F in raid-August, 

 and a maximum at the bottom of 81i°F at the same time. The water was 

 nearly isothermal at this shallow station throughout the year, seldom 

 having a gradient, surface to bottcra (b8 feet) of greater than 2°F. Ex- 

 ceptions occurred in May when the surface warmed up temporarily ahead 

 of the under l3ri_ng water. 



The surface salinity was depressed, March - J\me to approxi- 

 mately 3h /oo, increased to 36° /oo in July, gradually declined to 3!?°/oo 

 at year end. Bottom sal?ji:.ty was slightly greater than the surface 

 salinity diuring the first half of the year, but was essentially identi- 

 cal during the second half. 



Fi-ure 18. Savannah Lightshio, 1956. (Dashed line in upper diagram, mean for period 

 19U7-1955) 



125 



