It’s snow time in the Northern Hemisphere, the season of winter wonderlands and skiers’ delight. But most landlubbers don’t realize—as I didn’t until recently—that it’s always snowing in the sea.
This underwater snowfall, known as marine snow, drifts through every ocean on the planet. The term was coined in the early 1950s by Japanese researchers who described “snowflakes” swirling in waters stirred by their submersible. Invisible from shore and rarely noticed even by sailors, the silent drizzle helps keep the oceans productive and the planet healthy.


