Volcanic eruptions eject sulfur dioxide gas high into the atmosphere, forming sulfate aerosol chemically, and block the incoming sunlight like an umbrella. This causes surface cooling globally, but the response of global monsoon rainfall is different following volcano eruptions at different latitudes, according to quantitative research by Meng Zuo, a doctoral student from the Institute of Atmospheric Physics, Chinese Academy of Sciences, along with her mentors Prof. Tianjun Zhou and associate Prof. Wenmin Man.
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Source: Phys.org