NO. 4 TEMPERATURE VARIATIONS IX THE NORTH ATLANTIC 



63 



have a maximum in the years 1903 and 1904, and particularly the 

 curve for the second decade group shows a well marked maximum 

 for the year 1903. For the later years after 1905 the curves show 

 more similarity to the curve for the 10° longitude field to the east- 

 ward 50° to 59° west longitude and this, one might say, is to a 

 certain extent a transition field, to the fields further east. These 

 different types are shown distinctly in figures 21 and 22. 



Turning now from the consideration of these dissimilarities which 

 belong to the curves for the most western and most eastern region 

 to the continents, and considering all the results from the whole 



?9 1900 1 I 3 't 5 6 7 



9 10 



Figure 29. Curves for the anomalies of surface temperatures from 

 February 3 to March 4. 



I. Mean of all six 10" longitude fields, Channel to New York. 

 II. Mean of three most easterly 10° longitude fields, Channel to New York. 



III. Mean of all twelve 10° longitude fields, Portugal to the Azores. 



IV. Mean of three most westerly 10° longitude fields, Channel to New York. 



V. Mean of the curves — — and IV. 



assembly of fields within our investigated region as a whole, it is 

 apparent that certain great features are common to the great majority 

 of these curves. Hence we may conclude that if we should take 

 the mean of the temperature anomalies for each decade group for 

 each year for all the thousands of observations which we have col- 

 lected within this region, the results would yield a curve which 

 would exhibit the true condition for the whole North Atlantic Ocean. 

 We have found the mean of the anomalies for the average tem- 

 peratures for each year and for each decade group for the six 10° 



