system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If the Mt. Tambora eruption occurred in Spring 1815, why did it take over a year for the effects to be felt globally ("Year Without a Summer": 1816)?
gpt
Because the gases and particulates ejected into the atmosphere have a cumulative effect over time. Reflecting a few percent of the sun's radiation for a day our two won't have a huge effect.  Doing the same thing foyer months or years becomes a serious problem.