SCIENTIFIC EESULTS 



31 



ber^s, however, at the extreme nortliern end of the south flowinoj 

 c'linent phiees theui in a favorable position eventually to drift to 

 Newfoundland. 



In contrast to the regions of hummocks and of pressure rido;es, 

 large areas of open water, known as polynyas, also form within the 



The different Types of Sea Ice in the north Greenland sector 



rig. 16. - ( r' /. sea-ice discharged Into the Greenland Sea. f?v7 . sea-ice, congested 

 ^P th e paleocryetle region, /-.'.ifjy , paleocrystie area in some years. f/AV/VJ , fast ice. 



^^3 , many years old ice. ^^ , oilaissak. , Peary's "Big Lane" marks the line 



of shearing in the sea-ice corer. (Map after Koch, 1928). 



l)olar cap ice: these tend to occupy certain characteristic positions 

 in the polar basin, two regions now definitely established being: 



(a) A belt, or belts, several hundred miles long, parallel and just 

 northward of the Xew Siberian Islands. 



(h) Peary's "Big Lead." north of Grant Land and Greenland. 



The fact that polynyas are best developed off the New Siberian 

 Islands in winter when higli atmospheric pressure prevails over 



