JULY AUG SEPT 



FIGURE 13 MEAN MONTHLY MIXED LAYER DEPTHS FOR WEATHER SHIP DELTA, 44°N , 4I°W 



collected from weatlier snips, these g-rapha show th« i»ionthly 

 march of mixed layer depth at Atlantic weather ship stations 

 COCOA, DELTA, and ECHO. The features of these graphs are fa- 

 miliar* As a result of excess absorbed insolation over emit- 

 ted radiation, the thermocline forms in late spring and early 

 summer and is driven progressivelj ieeper by coatlnued mixing 

 during the late summer and autmnn., until it becomes indl^tin- 



MAY JUNE JULY AUG SEPT OCT NOV DE C 



FEB MAft 



50 



100 



150 



P 200 



f 250 



o 



a: 300 



3 350 



400 



450 



500 



550 



FIGURE 14 MEAN MONTHLY MIXED LAYER DEPTHS FOR WEATHER SHIP ECHO, 35°N.,48°W. 



38 



