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When volcanoes erupt, they send particles high into the sky that cool ocean waters.
This creates a "tripolar" effect: South Asia gets wetter, while Southeast Asia dries out, and northern East Asia follows South Asia's lead.
Dr. Man explained these changes happen outside of normal climate cycles.

The study cautions that deliberately injecting aerosols into the stratosphere would need careful study, because such interventions could interact with the climate system in complex ways.
As Dr. Man put it, such interventions could potentially amplify or modify natural variability that billions depend on, which isn't great news for anyone counting on steady monsoon rains.