Question 410

la) Do the sections in 1 igure 4.21 indicate ih;u flow through the Flnnda Straits is barotropic or baroclinic.'

I h i In w hich direction does the sea-surface slope, therefore ' Does this mean that flow is into the page* or 'out nt the page' in Figure 4.21(c) and id) ' In other words, on which side of the section is Florida and which Bimint'

icj Does the sea-surface simply slope up from one side to the other, or dots ii have a more complex shape*.'

Calculations of the sea-surface slope indicate that the sea-level is about 45 cm lower on the Florida side of the Straits than on the Bimini side.

Figure 4.22 shows the geostrophic velocity as calculated from T and S measurements made at hydrographic stations along an east-west line out from Cape Hatteras (cf. Figure 4.20(b)). The section illustrates how the current is no longer a relatively coherent flow, but instead typically consists of narrow vertical filaments separated by counter-currents - i.e. contrary flow (shaded blue).

In the regions shaded blue, does the horizontal pressure gradient force act tow ards the east I strict I\ south-east > or tow ards the w est t north-west)?

Figure 4.22 Geostrophic current velocity (in m s-1) in the Gulf Stream off Cape Hatteras; the section is east-west so the blue shaded areas (with negative velocity values) represent flow with a southerly component (probably south-westerly). The horizontal scale is smaller than that in Figure 4.21.

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