Photo: NASA / ZumaPress / Globallookpress.com
An international group of scientists have found that volcanic eruptions in the Northern hemisphere, including Russia, have a greater impact on climate than previously thought. About it reported in a press release on EurekAlert!.
It is known that some active extra-tropical volcanoes (Kasatochi in Alaska and Sarychev Peak in Russia), increase the content of sulfur in the lower atmosphere, but their impact on climate is weak and short-lived. It was thought that the volcanoes located in the southern latitudes, have a stronger influence on air shell of the Earth, as in warm climates, longer sulfur is removed from the stratosphere.
The results of the analysis of ice cores that contain sulfur, showed that over the past 1250 years, eruptions of tropical volcanoes really should have called a marked surface cooling in the Northern hemisphere. In other words, they are much stronger than cool the atmosphere than their tropical counterparts, even if they both emit the same amount of sulfur.
The cooling of the atmosphere occurs when gases containing sulphur, are emitted into the stratosphere, to a height of 10-15 kilometers. The result is an aerosol haze can last for several months or years. It reflects a significant part of entering atmosphere solar radiation back into space, causing a decrease in the average temperature. In Northern latitudes, the lifetime of sulfur aerosol is only slightly smaller than in the tropics. In addition, the climate impact was limited to the Northern hemisphere, which increased the cooling of the atmosphere.
Video, photo All from Russia.