Whose measurements first helped prove that volcanic eruptions can change the atmosphere globally?
Quick Answer
Guy Stewart Callendar and later atmospheric scientists helped connect eruptions with temperature changes, but the clearest proof came from 20th-century observations after eruptions like Krakatoa in 1883 and Pinatubo in 1991. These showed sunlight dimming and global cooling effects.
The Full Story
Atmospheric effects from eruptions became clear through repeated observations, especially after Krakatoa in 1883 and Mount Pinatubo in 1991. Scientists measured falling temperatures, reduced sunlight, and the spread of sulfate aerosols around the planet. The 1991 Pinatubo eruption cooled global average temperature by roughly 0.5 °C for a time, showing how powerful large eruptions can be. This research made volcanoes central to climate science, not just geology. It also improved models of atmospheric circulation and solar reflection.
Key Facts
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"How volcanic ash can cool the whole planet"
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