Transport Calculations 



INTRODUCTION 



Volume transports have been calculated for 

 all Standard Sections occupied during the win- 

 ter and spring of 1966. They will be discussed 

 in chronological order — section by section. 



STANDARD SECTION 3 



It was with a great deal of interest that data 

 from Standard Section 3 were analyzed be- 

 cause of the relatively large volume transport 

 changes observed by Kollmeyer, et al. (1965). 

 There were four complete occupations and 

 three partial occupations of this section during 

 1966. This provided the most extensive obser- 

 vations obtained at this location since the in- 

 ception of the International Ice Patrol. Volume 

 transport values calculated for this report fol- 

 lowed the procedure described by Kollmeyer, 

 et al. (1967). Property transports of heat and 

 salt were also computed as described by Koll- 

 meyer. Notice that the heat transports were 

 the product of the average temperature within 

 a solenoid and the volume transport through 

 the solenoid. This was not a true heat trans- 

 port calculation, but it was representative of 

 the heat transport for positive temperature 

 values. When negative temperatures were ob- 

 served, the average temperature within the 

 solenoid was negative. When this value was 

 used to compute a heat transport value for a 

 solenoid, the results were negative quantity. If 

 this was summed with positive heat transport 

 values, the results were straight algebraic ad- 

 dition. This caused some heat transport values 

 to have small negative values. 



This year volume transport values were 

 available for Standard Section 3 from 14 Feb- 

 ruary to 25 May 1966. These volume transports 

 were the total volume of southward flowing 

 water with Labrador Current characteristics. 

 These values were obtained by summing all 

 southerly solenoidal transport values with 



Labrador Current characteristics. These sole- 

 noids were generally between the trough sta- 

 tion and the station on the banks with the 

 highest dynamic height value. The volume 

 transports for 16-17 April 1966, 18-19 April 

 1966, and 21 April 1966 did not represent the 

 true values of total volume transports because 

 these three occupations did not extend far 

 enough eastward to delineate northward flow- 

 ing water. These values then were somewhat 

 less than the actual volume transport values. 

 For statistical purposes, it was assumed that 

 each of these three partial occupations repre- 

 sented the same fraction of total volume 

 transport. 



The numerical values for the volume trans- 

 ports are given in Table II. This information is 

 also presented as a function of time in Figure 

 64. This figure indicates that at least two max- 

 imums occurred in the volume transport of the 

 Labrador Current. There was a volume trans- 

 port of 5.87 X lO^m^/sec on 14-15 February 

 1966 and a volume transport of 5.25 X lO^m'/ 

 sec on 18-19 April 1966. This latter value did 

 not represent the total southerly volume trans- 

 port of the Labrador Current, but just the 

 volume transport through that portion of 

 Standard Section 3 that was occupied. Al- 

 though some subjectivity was used to deter- 

 mine the isopleth distribution of both the 

 CGC DUANE and CGC HUMBOLDT data, 

 these data definitely indicated that the Labra- 

 dor Current was well defined during the late 

 winter and early spring of 1966. It may be 

 assumed then that the Labrador Current is a 

 current that exists on a year round basis. 



Bullard, et al. (1961) derived tentative nor- 

 mal seasonal changes in volume transport 

 values that indicated the volume transport 

 through this section decreased from mid- 

 March through mid-June. The curves were ex- 

 tended using the average mean monthly rates 

 of change. Although the tendencies agreed 



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