How would the ocean currents of earth be altered if there was no Central America?

What if there was an alternate earth where there was no landmass between North America and South America. For clarification, in place of Central America there would be a sunken land bridge at the dept of the english channel.

I'm also curious about how this could affect climate as a result, but this is secondary.

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How would the ocean currents of earth be altered if there was no Central America?

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