Is there a man-made or natural event that can cause an abrupt climate change within hours/a day?

Meaning, cause a seemingly normal winter to suddenly take a turn within hours or a day/two into a completely frozen territory? From what I've read, abrupt climate change happens from ocean currents. Would dramatically shifting the weather happen due to maybe a giant glacier melting up north? I know there's global warming, but I'm looking for a natural "what if" for a story or man-made accident that would speed this up in a way that humans are unprepared for - and how this would affect the world.

Was reading that the Bering Straight is a 50 mile gap separating Siberia from Alaska, so if that closed, what would happen? It sounds like a more likely idea to use the Meridional overturning circulation (ocean currents) to trigger what's close to an ice age in North America?

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Is there a man-made or natural event that can cause an abrupt climate change within hours/a day?

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