Reversal of 

 seasons at a 

 depth of 200 

 metres. 



228 DEPTHS OF THE OCEAN chap. 



At a certain depth a displacement of the seasons is often 

 found. Repeated observations have been made by the 

 "Michael Sars " at a station outside the entrance to the 

 Sognefjord in different seasons and in different years. In 1903, 

 measurements were made at this station in the months of 



Fig. 160.— Surface Temperature of the North Atlantic in August. 



February, May, August, and November, and the following 

 temperatures were found : — 



At the surface it was coldest in February and warmest in 

 August — the difference being 9^ C. At 100 metres it was 

 coldest in May and warmest in November, with a difference of 

 2.9° C. At 200 metres it was coldest in August, warmest in 

 February and November, the difference being 1.2° C, so that 



