SCIENTIFIC RESULTS 



155 



((/) The seasonal cessation of the prevailin<r northwesterly winds 

 and the consequent removal of this frictional effect to build up a 

 slope current alon<: tlie North American coast to the northward of 

 tlie (irand Bank. 



The first advanced inforuuitioii on tlie impendin<»: failure in the 

 suj)ply of ice conies from an increase in the number of bergs 

 which be<^in to set down past St. Johns close in along the Newfound- 

 land coast. Icebergs also about this time collect in the greatest num- 

 bers on the nc»rthern slopes of the Grand Bank. The gradual swing 

 in the axis of the berg stream from out near Flemish Cap in March 

 to in ('lose to Cape Kace in flune and July has been likened to the 

 sliding of grain t(» a bin. as the chute is sloAvly deflected the supply 



Characteristic Types of Circulation East Side of the Grand Bank 



I<'1(;i;kk !t!t. — Tbe ice patrol dyiuimic topojrraphic maps have disc'osed two charac- 

 teristic forms of circulatifin which often prevail on the east side of the Grand 

 Bank. The one on the left shows how the (iulf Stream presses in t<iward the 

 eastern slope of the Grand Kank. blockin.i;- off the berj^s. and guaranteeing the 

 safety of tlie I'nited States-Europe lane routes. The map on the right sliows a 

 cyclonic depression in which bergs hiivc often Vieen i bserved. 



is likewise cut off. The fact that few or no icebergs drift south- 

 ward ])ast the Grand Bank and Newfoundland during the balance 

 of the year. August to December, seems in no way due to the lack 

 of icebergs in the north wliere they are continually calving from the 

 ic-e cap and drifting out into Davis Strait and Baffin Bay. 



July witnesses a still further slackening in the number of bergs 

 south of Newfoundland: the normal number by months is: July. 25; 

 August. IH: September. D: October. 4; November. 3; and December, 2. 

 Tlie bergs that do succeed in drifting past Newfoundland are found 

 hugging closely to the edge of the shelf and working inshore to the 

 shallow waters, wiiere the ice usually breaks uj) and disaj)pears. 

 Bergs in the area south of Newfoundland during the summer dissi- 

 l)ate veiy rapidly, due to the warmth of air and water. 



