What causes a second current at the bottom of a strait?
Can someone explain why there is a second current on the bottom of the Bosphorus Strait traveling in the opposite direction of the surface current?
I would have to do more research into the specific area to give you a detail answer but in general it's due to difference in water temperature and salinity of the water (how much salt is in the water), topography (the shape of the bottom of the strait) can also have an impact on the currents.
Doing a quick search, it looks like the Bosphorous Strait has different currents because the Black Sea and the Sea of Marmara flow into each other. The water from both seas are of a different density, most likely due to temperature and salinity causing one to flow near the surface (similar to hot air rising) and the cooler more dense current sinking to the bottom.
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