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Figure 6.35 Schematic diagram to Illustrate why potential vorticity is low in a homogeneous water mass; the example shown here is a central water mass. In the open ocean away from regions of strong current shear, f» £ and so potential vorticity = 1! D. If D is large, then fl D is small.

convergence

O increasing

□ increasing convergence

O increasing

□ increasing small D

isopycnals large D

small D

small D

isopycnals large D

small D

tID relatively large f/D relatively large tID relatively large pycnosiad f ID relatively smalt f/D relatively large

Figure 6.36 Distribution of salinity at the depth of the potential vortlcity minimum (largest separation of isopycnic surfaces) associated with a particular water mass (see text). The depth of the potential vorticity minimum varies, but it is about 1500 m. The heavy line indicates the furthest limit at which the potential vorticity minimum can be identified.

Figure 6.36 Distribution of salinity at the depth of the potential vortlcity minimum (largest separation of isopycnic surfaces) associated with a particular water mass (see text). The depth of the potential vorticity minimum varies, but it is about 1500 m. The heavy line indicates the furthest limit at which the potential vorticity minimum can be identified.

The spread of which water mass is shown by Figure 6.36?

The region of origin of the water mass is the Labrador Sea, and this, combined with the low salinities associated with the water mass, identify it as Labrador Sea Water (cf. Figures 6.17, 6.18 and 6.20).

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