The Millennium Eruption of Mt. Baekdu, one of the most powerful volcanic eruptions in the past 2000 years, occurred in late 946 A.D. Recently, volcanic ash rocks of different magma compositions have been found in the Mt. Baekdu area, suggesting that the eruption occurred in two eruptions, but the exact time between them has been difficult to determine. We found fine-grained ash from the Mount Baekdu millennial eruption in ice core samples from Greenland, and based on various glaciochemical analyses, it was determined that the Millennial Eruption occurred during the winter months and that the two major eruptions were separated by one to two months. Furthermore, the sulfur component from the Millennial Eruption was isolated from ice samples and analyzed in detail, suggesting that the volcanic gases from the Millennial Eruption released could not reach the ozone layer in the stratosphere and mostly stayed in the troposphere, temporarily blocking sunlight, and thus had no significant impact on climate change. The study was led by Seoul National University and collaborated with eight research centers in five countries, including Denmark, the United Kingdom, the United States, and Switzerland.

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