Mixing Is the Heartbeat of Deep Lakes. At Crater Lake, It’s Slowing Down.

On a radiant July afternoon, a pair of scientists hung their heads off the side of a boat and peered into the brilliant blue water of a lake known for its clarity. They were watching for the exact moment when a black-and-white, dinner plate–sized object called a Secchi disc disappeared from view in the water column of Crater Lake in Oregon. The disc was being slowly lowered by crane…

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