Ice in the Sea 



265 



Table 101. Mean monthly ice amounts (as a percentage of the mean annual ice) for the 



Newfoundland Grand Banks 



(t Max., I secondary Max.) 



In the Pacific Ocean, sea ice is limited to the north-western marginal seas; Bering 

 Sea, the Okhotsk Sea and the Sea of Japan. The ice limits for the periods of advance 

 (November to March) and retreat (March to July) are shown in Fig. 121. In the north 

 the Bering Sea is connected through the Bering Strait with the Tschuktschen Sea 

 where ice is plentiful. The mean annual duration of ice here is about 270 days, and the 



W 70° 



Fig. 119. Chart of the distribution of pack ice south of Newfoundland (according to 

 Huntsman). The short thick lines show the position of the ice fields at the time of maximum 



ice extent. 



Fig. 120. Annual ice variation in the area of the Newfoundland Banks. The full curve shows 

 the relative volume of drift ice normally present south of Newfoundland; the dashed curve 

 shows the mean number of icebergs present south of Newfoundland and in the western 

 Atlantic. The lower curve gives the mean number of icebergs south of the Grand Banks. 



