Volcanic eruptions inject sulfur gases high into the atmosphere, forming sulfate aerosol and blocking the incoming sunlight like a parasol. This causes decreased global monsoon rainfall, but the regional monsoon responses are different, which are dominated by the pre-eruption El Niño-Southern Oscillation (ENSO) phases, according to a study by Zuo Meng, a postdoctoral fellow from the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences.
Click here for original story, Monsoon rainfall’s response to volcanic eruptions relies on pre-eruption ENSO states
Source: Phys.org