© ReutersThe legacy of the ash and dust thrown up by the Puyehue-Cordon Caulle volcano in Chile may well live on.
Once all the flight disruptions have stopped, the ash has been cleared from the South American highways, and human affairs appear to have returned to normal, the legacy of the ash and dust thrown up by the Puyehue-Cordon Caulle volcano in Chile may well live on.
The longer-term effects of all this ash and dust could be of wider environmental concern than, say, a few hundred thousand stranded passengers, as difficult as it is for those people.
Volcanic eruptions are awesome spectacles. In part this is due to millions of tonnes of tiny ash and dust particles, known as volcanic aerosols, being blasted high into the air. We've all marvelled at the photographs.
In volcanic terms, the ash and dust plume created by Puyehue-Cordon Caulle was modest, only reported to have reached a height of around 15 kilometres. Large explosions, such as the 1991 eruption of Mount Pinatubo in the Philippines, can create plumes in excess of 34 kilometres high and 400 kilometres wide, ejecting more than 17 million tons of aerosols.
But even as a modest eruption, the Chilean volcano could have ejected enough ash and dust into the stratosphere to have some long-term climatic effects, which could in turn affect agriculture and impact on human wellbeing and quality of life.
The reason is that large volumes of aerosols can, depending on how high they 'sit' in the air and how long they remain there, have a measurable cooling effect. The higher the dust gets into the atmosphere and the more of it there is, the greater its capacity to reflect heat from the sun, which cools the land below.
Comment: For more information concerning what the mainstream media is lacking coverage, see this Sott link:
12 Things That The Mainstream Media Is Being Strangely Quiet About Right Now