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When we measure the Fresh Water Content of the ACC, we
are measuring the combined effects of the coastal FWD, the wind mixing and any
possible effects of Ekman transport. If you'll imagine a box that contains the
coastal region, including the front, with the bulk of the fresh water sitting
against the coast. This box extends 40 km offshore and from the surface to the
bottom: this is our integration region. Downwelling winds offshore will tend
to move fresh surface water onshore into our coastal box in the Ekman layer
and this flow will be compensated by return flow at depth from the box to the
offshore region. We have made annual estimates of the gain/loss of fresh water
to our coastal current with three experiments, depending on where the return
flow is taking place:
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