- 31 - 



level is nble to t^ke plnce. It Is not until Inte Jnnxa^ry th^t the 

 wqter in the Ilw^ ' levels cqn be displnced throuprh vertical mixing. 



The incre'^Rp in <-he aqlinity of the bottom Iqyers cnn only t-^ke 

 place when .-^ supply of wnter of greater snlinity is e^vpil-^bleo The 

 replacement by outside waters undoubtedly tikes plnce continuously, 

 but the mrtgnitiide of the supply nppenrs to v^ry considerably. In 

 figure 35(b), we note that in eprly Jf^nu^ry, 1916, the snlinity of 

 the bottom layer incre'^sed to n considemble extent. Compnroble in- 

 creases occur ctgqin in enrly August 1917, *nd agnin in early April 

 1918. A considerable difference in salinity at the various levels is 

 to be noted in comparing the conditions of January, 1917, with those 

 of January 1918. 



IV. Temperatures at Station 5 



Typical temperature-depth curves of water conditions at Station 5 

 for e-'ch month for the years 1924 through 1930 are shown in figure 36. 

 It will be noted that throughout the period the coldest surface water 

 is always found in February or Mr>rcho The coldest water at a depth 

 of 20 metres is found in March in all years with the exception of 

 1930 when the coldest water at this depth was found in February. At 

 a depth of 90 metres the coldest v/ater was found in February in 1924 ^ 

 in April in 1929, and in March for all other years. The warmest sur- 

 face v/aters occur in August or September, in all yesrs except in 1927 

 and 1930, when the peak was reached in October. The warmest v/ater at 

 90 metres occur in September or October. The maximum ^nd minimum 

 temperatures of each level for each year of the complete period is 

 given as follows: 



