concentration of 14 yngA/1 at 200 meters and again 

 at the bottom. 



Lower nitrate concentrations occur in Smith 

 Sound. A small area with a concentration of 

 10 jttgA/1 is seen in figure 41a as a tongue dipping 

 down from 150 meters near Cape Alexander to a 

 little below 200 meters at station 8774. The gen- 

 eral level of deep water is between 8 and 9 /tgA/1, 

 with isolated pockets of higher and lower concen- 

 trations also seen. A slight increase in the level 

 of nitrate is seen in the next section (fig. 41b). 

 Values greater than 10 /^gA/1 are found from 100 

 meters near Murchison Sound and slope westward 

 to the deep water. Similarly the low concentra- 

 tions at the surface (less than 5 yngA/1) show a 

 slope to the westward, reaching to a depth of 200 

 meters at station 8775. Maximum nitrate values 

 remain concentrated on the eastern side in the sec- 

 tion from Cape Combermere to Cape Parry (fig. 

 41c) . Nitrate levels in the deep water rise to 13 

 mgA/1 and even values of 14 /ugA/1 in the central 

 basin, while the deep trench at station 8778 has 

 reduced nitrate values in its greatest depths. 



The section from Cape Norton Shaw to Cape 

 Atholl, Greenland (fig. 42) introduces considerable 

 more complexity in the nitrate distribution pat- 

 tern. The surface concentrations across the sec- 

 tion are less than 1 ^gA/1, rising rapidly to values 

 about 5 /ugA/1 in most of the area. However, very 

 low values persist along the eastern margin of the 

 section and in a depression near the western border. 

 The deep water on the western side reaches a maxi- 

 mum of 10 /ugA/1 at a depth of 250 meters. The 

 highest values in the section are found at 200 

 meters in the eastern part of the area, where ni- 

 trate concentrations as high as 15 /xgA/1 occur. 

 In this same region, however, the deepest water 

 drops to a minimum value of 5 jug A/1, although a 

 small increase at the bottom can be seen in the 

 center of the basin. 



The longitudinal variation (fig. 43) is pre- 

 sented in a more diagrammatic fashion, since only 

 every fifth contour is indicated. Values in the 

 Kane Basin and Smith Sound are lower than those 

 occurring in the northern reaches of Baffin Bay. 

 The slope area leading to deep water in Baffin Bay 

 has high nitrate concentrations of 15 to 20 /tgA/1. 



Separate profiles have not been given for the 

 nitrite-nitrogen which was also determined, but 

 the data are presented in the records of the cruise. 

 Low values were obtained throughout the area, 



with a concentration as great as 0.1 ftgA/1 being 

 found only occasionally. 



Silicate-Silicon (figs. 44 through 47). 



High silicate concentrations of more than 10 

 /tgA/1 are found at about 100 meters depth on the 

 eastern and western rims of the northern Kane 

 Basin (fig. 44a), while a band of 9 mgA/1 silicate 

 occurs across the basin at a depth of 200 meters. 

 Low values of 5 to 6 /ugA/1 predominate at the 

 bottom. In the central Kane Basin (fig. 44b) the 

 maximum on the western slope at station 8750 

 reaches 12 /tgA/1 at 100 meters, and the silicate 

 values then decrease. On the eastern side, how- 

 ever, the silicates show a continual increase from 

 surface to bottom at station 8758. The middle 

 portion of the south Kane Basin (fig. 44c) attains 

 values greater than 13 /xgA/1 from 100 to 200 

 meters. Low values are seen on each slope. The 

 deep water on the eastern side of the basin main- 

 tains a high concentration greater than 12 /*gA/l, 

 while on the western side the concentration de- 

 creases to less than 10 ju.gA/1 by 400 meters. 



The highest silicate concentrations in Smith 

 Sound (fig. 45a) occur as a tongue from the east- 

 ern side between 100 and 200 meters, where a value 

 of 14 jugA/1 is attained. Below 250 meters the con- 

 centration decreases to 7 /xgA/l at 400 meters. 

 Except for a small rise in the deep water of the 

 eastern slope, the silicate remains low to the bot- 

 tom. Conditions in the area of Murchison Sound 

 (fig. 45b) are much the same, except that the deep 

 water below 200 meters at station 8776 remains 

 over 12 /*gA/l to the bottom while the eastern slope 

 area decreases to 8 /igA/1. Surface values in the 

 section from Cape Combermere to Cape Parry 

 (fig. 45c) are low — a concentration of 5 ^gA/1 is 

 not found in the central basin until a depth of 100 

 meters. The highest silicate concentrations occur 

 as a tongue near Cape Parry where a maximum of 

 19 jugA/1 is found just below 200 meters. Below 

 300 meters the deep water of the basin is about 

 9 figA/1 except for a small area of high concen- 

 tration along the bottom of the main basin, not 

 extending into the deep trench near Cape Parry 

 itself. 



The section from Cape Norton Shaw to Cape 

 Atholl shows considerable complexity in its dis- 

 tribution pattern (fig. 46). Near the Greenland 

 coast surface values are depressed, but a large area 

 of high silicate concentration appears off the east- 

 ern slope at a depth of 200 meters. A maximum 



40 



