NOAA PROFESSIONAL PAPER 11 



rs3 — s— — I — 



41° 



40° 



39° 



75= 



74": 



73° 



72 o 



71° 



FIGURE 8-4— Input field of a expressed as (a/W-l)10'. Density 

 (sigma-( units). 



results for each interval are presented in figure 8-10. The 

 average transport over the entire interval (fig. 8-11) was 

 calculated by weighting each pattern in proportion to the 

 duration it represents. The horizontal fluxes through each 

 segment boundary were computed by multiplying the 

 length of the boundary transect in each triangle by the 

 transport component through the transect and summing 

 over the triangles making up the transect. The vertical 

 flux, Q^, in each segment was calculated to satisfy the 

 continuity relationship (eq. 5). The term AK/Af in eq. (5) 

 was estimated from the change in volume between XWCC-9 

 and XWCC-10. It was found to be an order of magnitude 

 smaller than the other terms and was ignored in eq. (5) 

 and in eq. (4). Hudson River discharge was also ignored 

 because the magnitude of even the largest monthly av- 

 erage flow is an order of magnitude smaller than the fluxes 

 in the Apex segment and would not contribute signifi- 

 cantly to the water balance. 



Oxygen Transport 



Dissolved oxygen (D.O.) data for application in eq. 

 (4) were acquired on MESA cruises XWCC-9 and 

 XWCC-10. The patterns of D.O. concentration are shown 

 in chapter 2. Volume-averaged concentrations were cal- 

 culated by first finding the average concentration in the 

 upper and lower layer at each STD station. Then the thick- 

 ness of each layer (fig. 8-6) multiplied by the average 

 concentration and weighted by an area factor, taken as 

 1.0 for interior points and 0.5 for points on the segment 

 boundary. 



These were summed for each segment, divided by the 

 sum of the weights, and multiplied by the segment surface 

 area to yield the oxygen mass in each layer of each seg- 

 ment. The same process was repeated with the layer thick- 

 ness alone to give the volume in each layer of each seg- 

 ment. Table 8-1 contains the values of surface area, 

 volume, and D.O. for each segment. Because no data 



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