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Question: in reality the surface is not flat to figure out...

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100 km Ocean Surface 200 m depth 600 m 1100 m 900 m 400 m 1500 m depth Ocean bottom Posltion A Positibn B The upper layer (li

in reality the surface is not flat! To figure out what the surface is actually doing: we can:

• make assumptions about the flow in one of the layers. This is traditional method. Here the common assumption would be that the flow in the middle layer is zero.

• use satellites to measure the sea surface height difference.

Lets say we used the second method and we find that the surface height at Position B is 1 m higher than the surface height at Position A.

3. How much higher is the pressure at 200 m at Position B than at Position A?

4. Assuming 200 m is well below the Ekman layer, calculate the velocity at 200 m between Position A and Position B. What direction is this flow in?

5. Now consider the pressure at Position A and Position B at 1500 m with this tilted surface. What is the difference in pressure between these two points? what is the velocity here?

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