Why does volcanic eruption affect the climate?

After the eruption of 0 1 volcano, a large amount of volcanic dust was continuously sent into the atmosphere, which reduced the solar radiation heat in some areas. In addition, volcanic dust is the condensation nucleus of clouds and water droplets in the atmosphere, and the sky is full of volcanic dust, so it is very easy to form clouds and rain. There are many clouds and water droplets in the sky, which obviously weakens the solar radiation heat. Therefore, during 1 and 2 years of volcanic eruption, the climate in some parts of the earth will get cold, especially in summer.

1783 6? In July, there were two volcanic eruptions in Iceland near the Arctic Circle. At that time, it was recorded that volcanic dust was everywhere due to volcanic eruption. In southern France, the sun rises to 17 on the horizon. People can't tell at all. In Britain, the sun rises to 20 degrees? The color of the sun is bronze. During this period, the sky in Italy was gloomy and fuzzy all day, and there was no sunshine. Volcanic ash enveloped the whole of western Europe.

19 15, the Tambora volcano in Sombawa, Indonesia erupted, and the rumbling can be clearly heard even at a distance of 1750 km; Lava spewed 40 kilometers away, nearly 10 thousand people died, and volcanic ash entered the sky, making the next year a rare cold year in American history. That year, the United States was not only cold in spring, summer and autumn, but also snowed in June and frost in July, which led to the failure to harvest crops in the northeastern United States. Someone wrote such a diary: On July 7th, I wore a thick sweater to work. After work, I put down my tools and went home. It's so cold that I need to wear gloves.

1980 on may 8 and 25, June 12, and July 22, four major eruptions occurred in mount St. hellens, Washington, USA. Every eruption, a huge mushroom cloud composed of smoke and dust rises rapidly, just like a hydrogen bomb explosion. It was dark at the moment, and the day suddenly turned into night, and I couldn't see my fingers. Because volcanic ash moves in the air with the airflow, there is an obvious Leng Xia in the Yangtze River basin in China this year, especially in August. Take Shanghai as an example, the average monthly temperature is only 24.8℃, which is 3.0℃ lower than normal. Indeed, volcanic eruptions have indeed lowered the climate in some areas.

The reason why volcanic eruption makes the climate in some areas cool is that a large amount of volcanic dust is continuously sent into the atmosphere, the thickness of which can reach 0.53 km, and it can wander in the troposphere and stratosphere for 1 or 2 years, thus reducing the solar radiation heat in some areas by 10%30%. In addition, volcanic dust is the condensation nucleus of clouds and water droplets in the atmosphere, and the sky is full of volcanic dust, so it is very easy to form clouds and rain. There are many clouds and water droplets in the sky, which obviously weakens the solar radiation heat. Therefore, during 1 and 2 years of volcanic eruption, the climate in some parts of the earth will get cold, especially in summer.