Carbon dioxide may be released into the atmosphere in large volcanic eruptions.
Explosive eruptions have the potential to significantly lower global surface temperatures over periods of one to ten years. Since our temperature records frequently reveal distinct drops in temperature after big eruptions, we have known about this cooling for millennia.
One of the most striking examples of this was the massive Mount Tambora eruption in 1815, which led to a 1°C reduction in global land temperatures. The stratosphere, which is the layer of the atmosphere 10 to 50 km above the surface, was pumped with volcanic gases as a result of the eruption’s high energy. Incoming sunlight was obstructed as a result, which reduced the amount of sunshine that reached the Earth’s surface.
Although it is often the case, more explosive volcanoes do not always result in more global cooling. It relies on wind systems and whether the expelled gases reach the stratosphere. Due to its gases not remaining in the stratosphere, Mount St. Helens, one of the most destructive eruptions of recent times, rarely made a mark on world temperatures.
Would volcanic eruptions be able to cool the rising temperatures brought on by climate change? regrettably, no. Over the course of history, volcanic eruptions have taken place and are a normal part of our environment. Their impact is also fleeting; surface warming from high carbon dioxide emissions lasts for thousands of years whereas surface cooling from eruptions lasts just a few years.
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