Volcanologists watch closely for plumes that reach the stratosphere because they tend to stay aloft for longer than those that remain within the troposphere. That is why plumes that reaches the stratosphere typically have the greatest effects on aviation and climate.
https://earthobservatory.nasa.gov/images/145226/raikoke-erupts https://earthobservatory.nasa.gov/images/145226/raikoke-erupts
https://earthobservatory.nasa.gov/images/145226/raikoke-erupts https://earthobservatory.nasa.gov/images/145226/raikoke-erupts
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