STA. 



TEMPERATURE 

 14 16 18 



50 



100 



^ I 50 



200 



250 



100 



WARM SIDE 



MIDDLE D — 



COOL SIDE ~* — 



J I I L 



150 



200 



■7 8 KM- 



250 



Figure 18. — Temperature profile and temperature-depth curves for the second (E) triplet of hydrocasts at front 

 5 (23 April 1961). c - cool side; m = middle; w = warm side; • = Nansen bottle depths in profile. 



follows: the minimum value on the pass was 

 subtracted from the maximum value, and this 

 difference was divided by the distance between 

 the two BT's to which the maximum and mini- 

 mum corresponded. Where alternative choices 



Property 



of BT's are possible (e.g., salinity is same at 

 BT's 4 and 5) gradients have been arbitrarily 

 maximized by choosing the lesser distance. 

 The gradients are: 



Gradient 



Temperature 0.43° C. km.-l. . . . 



Salinity 0.12°'c,o km."l. . . . . 



Thermosteric anomaly . . 5.5 cl. ton" km.'l . 



BT's 



1 - 21 

 5-18 

 1 - 21 



Oxygen distribution .-- Above the mixed 

 layer, oxygen is more or less at saturation 

 level and its distribution is mainly determined 

 by the temperature distribution: the cooler 

 water has a higher dissolved oxygen content 

 than has the warmer water. 



Some of the oxygen isopleths deepen rapidly 

 near the "cool" station in the B series profile 

 (fig. 26), as do the isotherms and isanosteres. 



The 2, 2.5, and 3 ml.l." isopleths become 

 relatively widely separated between 35 and 

 65 m. depth at the "middle" and "warm" sta- 

 tions. This zone of separation corresponds 

 more or less to the inversion zone which may 

 also be referred to as the mixing zone, because 

 the temperature gradients are weakest in it 

 (fig. 15). 



25 



