Enter the Twilight Zone: Scientists dive into the oceans’ mysterious middle

As part of a $25-million mission, NASA will travel to the north Atlantic in April with the WHOI OTZ team to study the movement of carbon between the atmosphere and the deep ocean via the twilight zone. The ocean provides a crucial service to humanity by pulling carbon out of the atmosphere, and that depends on what happens in the twilight zone, says Ken Buesseler, a marine radiochemist at the Woods Hole Oceanographic Institution (WHOI) in Massachusetts. “It’s that simple,” he says, “but it’s not easy to measure.”

Read more in Nature magazine.