Ocean currents: Debut of the global mix-master

This item was filled under Climate
The Atlantic Circumpolar Current encircles Antarctica with a constant eastward flow in the Southern Ocean. Researchers determined that it originated 30 million years ago, several million years after the tectonic opening of a deep-water channel in the Tasmanian gateway. The Tasmanian gateway was initially the conduit for westward current flow, but as the gateway migrated north tectonically, it eventually aligned with the mid-latitude westerly winds and effected the onset of the Antarctic Circumpolar Current....
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