You don’t have to fall into a volcano or be engulfed in molten lava to experience its dangers.
A volcano’s ash plume can be as dangerous as a sky full of razor blades.
The 2010 eruption of the Eyjafjallajokull Glacier volcano in Iceland sent ash plumes high into the atmosphere. When the plume drifted over the United Kingdom and Europe, airline flights were cancelled.
Jet engines on airplanes don’t like ash any more than your lungs do. The powdery ashes are like tiny shards of broken glass. The particles are very sharp, rough and abrasive to any surface they encounter, especially at high speed. Jet engine turbine blades are definitely in that category.
Besides the abrasion problem, the inside of the jet engine is hot enough to melt the glassy particles, clogging up parts of the engine. Flying through a thick plume of volcanic ash is a sure way to shut down a jet engine pronto.
Much better, in this case, to keep the planes on the ground—or figure out exactly where the plume is and avoid it. Even if a plume is too thin and spread out to see, it could still have enough ash particles to pose a hazard.
So how can airplane operators find the plume so they know where to not send the planes?
Like clouds, the ash plume moves with the wind currents. Weather forecasters have computer models to help predict where the plume will go next. But they still need to be able to monitor it and make sure it is really going where the computers say it is going. They also need to be able to evaluate how thick and dangerous the plume really is.
The GOES satellites gather images at different wavelengths of light that can be processed to show where the ash plume is. However, the image doesn’t really say much about the particle concentrations or sizes, important information for aviation.
Currently, the Advanced Satellite Products Branch and the Cooperative Institute for Meteorological Satellite studies at the University of Wisconsin at Madison as well as the Cooperative Institute for Research in the Atmosphere (CIRA) in Fort Collins, Colorado, together with the NOAA/NESDIS RAMM Branch develops and distributes the volcanic ash data products.
The new Advanced Baseline Imager on the upcoming GOES-R series of satellites will do a much better job of gathering data from more different wavelengths of light so that a much more detailed picture of the ash plume can be made, including its extent, height, mass, and particle size. This information will also be used to further develop those computer models that predict where the ash plume will go and where the ash will fall.
The GOES-R series will give aviators the information they need to fly through or around volcanic plumes safely, and those on the ground advance warning of when to go inside and hold their breath!