Medieval lunar eclipse observations show how volcanoes affect Earth's climate

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Medieval lunar eclipse observations show how volcanoes affect Earth's climate
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'What I find particularly fascinating about these results is the intersection of ancient knowledge and modern science.'

, the moon takes on a reddish hue because of the way Earth's atmosphere scatters sunlight onto the shadowed area. Blue and green light gets scattered more than red light, leaving mostly red light to fall on the moon, Guillet explained.

"Some of the darkest total lunar eclipses ever recorded followed large volcanic eruptions, such as theThe scientists examined a total of 180 European, 10 Middle Eastern and 199 East Asian medieval records. These respectively described 51, 7 and 61 total lunar eclipses. By examining the color and brightness of total lunar eclipses in ancient texts, the researchers could estimate the strength of the effect volcanic eruptions had on the stratosphere and therefore global climate. The research team's findings suggested they could estimate the year and, in some cases, even the month of volcanic eruptions.

The researchers then compared these estimates with tree-ring records in the Northern Hemisphere, in which unusually cold summers are linked to reduced wood formation. They found that five of these eruptions in 1110, 1172, 1229, 1258 and 1276 AD had a strong impact on the climate, while the remaining eruptions seemed to have had less effect.

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