A deluge struck California over the holidays. With almost daily downpours, my rain gauge recorded thirteen inches in less than two weeks. Trees fell. Cables snapped. Thousands lost power. For a while, our neighborhood became an island, with roads flooded in every direction. During a typical winter, rain collects in shallow depressions in the land, called vernal ponds. This year entire fields turned to lakes.
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.
