What is Big Think?  

We are Big Idea Hunters…

We live in a time of information abundance, which far too many of us see as information overload. With the sum total of human knowledge, past and present, at our fingertips, we’re faced with a crisis of attention: which ideas should we engage with, and why? Big Think is an evolving roadmap to the best thinking on the planet — the ideas that can help you think flexibly and act decisively in a multivariate world.

A word about Big Ideas and Themes — The architecture of Big Think

Big ideas are lenses for envisioning the future. Every article and video on bigthink.com and on our learning platforms is based on an emerging “big idea” that is significant, widely relevant, and actionable. We’re sifting the noise for the questions and insights that have the power to change all of our lives, for decades to come. For example, reverse-engineering is a big idea in that the concept is increasingly useful across multiple disciplines, from education to nanotechnology.

Themes are the seven broad umbrellas under which we organize the hundreds of big ideas that populate Big Think. They include New World Order, Earth and Beyond, 21st Century Living, Going Mental, Extreme Biology, Power and Influence, and Inventing the Future.

Big Think Features:

12,000+ Expert Videos

1

Browse videos featuring experts across a wide range of disciplines, from personal health to business leadership to neuroscience.

Watch videos

World Renowned Bloggers

2

Big Think’s contributors offer expert analysis of the big ideas behind the news.

Go to blogs

Big Think Edge

3

Big Think’s Edge learning platform for career mentorship and professional development provides engaging and actionable courses delivered by the people who are shaping our future.

Find out more
Close

Closing airspace over eruption due to Eyjafjallajökull ash was "right decision"

April 26, 2011, 10:01 AM
Europe-ash-cloud

There has been an awful lot of debate about the decision to close the airspace over Europe for days during the beginning of the explosive phase at Eyjafjallajökull last spring. Many critics of the closure said that European officials didn't have enough hard data, such as actual ash particulate counts or imagery of the location of ash in the atmosphere. However, much of this type of data was impossible to collect on a meaningful level because the apparatus was not in place for this type of rapid data collection of ash in the skies of Europe.

While it is easy to look back and say what should have happened, it can sometimes be useful as to help us better understand to how to handle the next crisis. It now appears that the EU officials made the right decision to err on the side of caution when it came to the volcanic ash over the continental and England/Ireland.

A new study by Gislason et al. (2011) in the Proceedings of the National Academy of Sciences examined the ash from the eruption - collected during the airspace closure - and found some interesting features of the ash that made the airspace closure necessary:

  • The ash was finer grained than typical volcanic ash, with ~20% of the explosive ash less than 10 micron in size. This is likely due to the high explosivity generated from the magma-water interaction during the initial eruption. This meant the ash could get higher into the atmosphere and travel further.
  • The small particle size would have meant that the ash would more easily melt in jet engines as well.
  • The ash was particularly angular (see below), meaning its ability to abrade aircraft was higher than typical ash.
  • It was also harder than typical volcanic ash because it was andesitic glass and mafic minerals such as olivine and pyroxene, rather than softer dacitic to rhyolitic glass found in more typical large ash clouds. This also added to the abrasive factor.

An SEM image (similar to those posted by some Eruptions readers) of Eyjafjallajökull ash

Although EU officials did not know this information at the time of the closure, it does appear that their abundance of caution was likely prudent ~ of course, saying this now puts more deliberate thoughts into the heads of the EU officials during the crisis. However, these findings suggest that letting air traffic continue to move might have been a poor idea.

The study concludes by suggesting that in future eruptions, the size, shape and hardness of the ash be characterized quickly to help to assessment of potential hazard - both to aircraft and to inhalation. This would, of course, work in cooperation with any models to predict the location of the ash in the atmosphere, but would offer a much fuller picture of the threat. Most of the instrumentation (scanning electron microscopes, x-ray diffraction, etc.) to do these measurements of ash already exists at many universities and laboratories, so it shouldn't be a challenge - however, as with any crisis, it falls to government to implement a plan that can be easily followed during an eruption. This way we will have all the appropriate information to make a more educated decision about the threat of ash in future eruptions.

Top left: Examining the ash spreading over the North Atlantic and Europe during late April, 2011.

 

Closing airspace over erupt...

Newsletter: Share: