36 0 36 2 salinity, S

source region

Figura S.30 Highly schematic diagram showing how a water mass formed over an area with a range ot surface conditions will be represented by a segment ola J-S diagram (a) Water with a range ol T-S values is formed at the surface and sinks/mixes down isopycmc surfaces, with the result that data collected at hydrographie station A plot onto a T-Sdiag'am (b) to produce a line as shown. Temoeratures are gii/er In 'C

Returning to mixing hetweeti water masses, the procedure described above in relation to figure fS can be extended to the more complex situation where three water types. I. II and 1(1, are mixing together. In this case, the mixture R must lie inside the triangle formed by joining points 1. 11 and 111 together on the T-S diagram las in Figure fO It. If we know (from measurement) the temperature and salinity of W [TH. SKh the relative proportions of the intermixing water types contributing to R can be determined by a simple til slightly tedious) graphical procedure This is shown in Figure I. w liich we can use 10 determine the relative proportions of water types 1. 11 and III. Using a ruler to measure the segments u-f. and inserting values (here rounded off to the nearest 0.05) in the formula show n on the diagram, we get

In other words, water type R on Figure 6.31 is ihe result ol the mixing together of approximately 40% of water type 1. 45% of water type II and 15% of water type III.

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