186 MARION EXPEDITION TO DAVIS STRAIT AND BAFFIN BAY 



The iiiontlily values for {c') were then (orrelated Avith (a) giving 

 the following coefficients : 

 Between («) and (<?') — 



It is ai^parent from this that the November and Ai)ril gradients 

 have little effect on the iceberg dispersal. i)robably because in Novem- 

 ber the berg train is just putting in its appearance while in April 

 the character of the drift is well established. The values of 0.48 and 

 0.43 in Decend)er and January respectively indicate, furthermore, 

 that those two months exert twice as strong an influence on the ice 

 as do any of the other months of the year. When the value of (c') 

 was expressed in monthly units and combined with the following 

 weights : 



2 X Dec. + 2 X Jan. + 1 X Feb. + 1 X Mar. 



tlie 4-monthlv group values of {(■') correlated with (a) vielded 

 the high coefficient of -0.5S for the i)eriod 18S0-192G. 



The Stykkisholm-Bergen pressure gradient gave the following 

 coefficients which sliow that its iceberg effect does not connueuce until 

 October and is mostly ended })y February. 



Between (tr) and (<■/) — 



Aug. Sept. Ocr. Nov. Dee. Jan. Feb. 



-0.07 -0.09 -0.26 -0.22 -0.53 -0.28 -0.10 



The months were accordingly arranged in the following manner: 



1 X Oct. + 1 X Nov. + 2 X Dec. + 1 X Jan. 



Emi)loving seasonal values combined as above, we obtained a coeffi- 

 cient of -0.62 for the series 1880-1926. 



A study was also nuide of the degree to which the angle that the 

 isobars make with the Labrador coast (see (e)) affects the number of 

 icebergs passing Newfoundland. It had been assumed that the pres- 

 sure gradient between Ivigtut and lielle Isle was nearly at right 

 angles to tlie most effective direction of the wind; an angle of about 

 38° Avith the Labrador coast. Correlation values indicate that 30' off 

 the general coastal trend is the most effective direction, and since 

 the run of the wind in high-pressure centers is about 30° across 

 the isobars, the most effective wind diiei-tiou is. therefore, approxi- 

 mately 60°. 



'J'he remaining vai'iates tested in the investigation were (</) and 

 (//). with a lag of one yeai". which gave the following coefficient-!: 



Between (r/) and (r/) — 



Jan. Feb. Mar. .\pr. May June 



-0.14 -0.29 -0.27 +0.19 -0.33 -0.22 



July .\UB. Sept. Oct. Nov. Dec. 



-f0.19 -0.17 -0.15 -0.23 -0.07 -0.03 



i 



