Discussion
Under the thermohaline circulation, the oldest waters with a transit time of about 1600 years are upwalled in the :
Answer: D
The oldest waters upwell in the North Pacific.
In the global thermohaline circulation, deep water forms by sinking in the North Atlantic and around Antarctica, then spreads slowly through the deep ocean. The North Pacific lies at the far end of this path, so its deep water has been longest out of contact with the atmosphere; radiocarbon ages there reach well over a thousand years, the oldest in the ocean.
The North Atlantic is where deep water forms, so its deep water is the youngest. The South Atlantic and Indian Oceans lie part-way along the path, and their deep waters are younger than those of the North Pacific.
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