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