Volcanic ash shuts down air traffic and can sicken people. But a new study suggests that it may also be more important for Earth’s climate than scientists once thought.

A new study led by the University of Colorado Boulder suggests that such volcanic ash may also have a larger influence on the planet’s climate than scientists previously suspected.

The new research, published in the journal Nature Communications, examines the eruption of Mount Kelut (or Kelud) on the Indonesian island of Java in 2014. Drawing on real-world observations of this event and advanced computer simulations, the team discovered that volcanic ash seems to be prone to loitering — remaining in the air for months or even longer after a major eruption.

«What we found for this eruption is that the volcanic ash can persist for a long time,» said Yunqian Zhu, lead author of the new study and a research scientist at the Laboratory for Atmospheric and Space Physics (LASP) at CU Boulder.

Lingering ash

The discovery began with a chance observation: Members of the research team had been flying an unmanned aircraft near the site of the Mount Kelut eruption — an event that covered large portions of Java in ash and drove people from their homes. In the process, the aircraft spotted something that shouldn’t have been there.

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Materials provided by University of Colorado at Boulder. Original written by Daniel Strain. Note: Content may be edited for style and length.