Using computer simulations, researchers are investigating the likely atmospheric effects if a “flood lava” eruption took place in Iceland today. Flood lava eruptions, which stand out for the sheer amounts of lava and sulfurous gases they release and the way their lava sprays from cracks like fiery fountains, have occurred in Iceland four times in roughly the past thousand years, records indicate, the most recent being the deadly and remarkable eruption of Iceland’s volcano Laki in 1783-84.
When Laki sprang to life on June 8, 1783, it generated a sulfuric acid haze that dispersed over Iceland, France, England, the Netherlands, Sweden, Italy, and other countries. It killed a fifth of Iceland’s population and three-quarters of the island’s livestock. It also destroyed crops, withered vegetation, and sowed human disease and death in several Northern European nations. During the eight months that Laki erupted, the volcano blasted 122 million tons of sulfur dioxide into the atmosphere – seven times more than did the 1991 Mt. Pinatubo eruption in the Philippines and approximately 50 to 100 times more per day than Iceland’s Eyjafjallajökull volcano released in 2010.
Researchers have found evidence in previous studies that a modern Laki-like eruption could disrupt European air traffic. Now, using two computer models that simulate physical and chemical behaviors of volcanic emissions, atmospheric scientist Anja Schmidt of the University of Leeds in the U.K. and her colleagues are refining scientific understanding of the likely concentrations and distributions of hazardous sulfur dioxide gas and sulfuric acid from such an event.
If a Laki-like eruption were to begin in late spring or summer, as it did in 1783, the daily average concentrations of sulfur dioxide during that first month would exceed 40 parts per billion by volume (ppbv) in up to a third of the North Atlantic and European airspace, the new simulations show. That concentration falls just under the level of 47 ppbv at which the World Health Organization (WHO) deems chronic exposure to the gas a health hazard, although short-term exposures are considered hazardous only at much higher concentrations. In up to 10 percent of the air space, concentrations would exceed five times the WHO chronic exposure guideline, the researchers found.
The emissions wouldn’t come from Laki itself, which volcanologists say has spent its fury, but could explode from several other Icelandic volcanic systems.Most sulfur dioxide gas emitted by volcanoes rapidly undergoes chemical reactions to form an aerosol – minuscule particles suspended in the atmosphere -- of sulfuric acid droplets. In the new simulations – focusing again on the first month of the eruption -- average daily concentrations of the droplets, in up to 10 percent of the air space, would exceed 10 times London’s average daily concentration of the corrosive pollutant, the researchers found.
Kate Ramsayer | American Geophysical Union
Welcome Committee for Comets
19.07.2019 | Technische Universität Braunschweig
Sea level rise: West Antarctic ice collapse may be prevented by snowing ocean water onto it
18.07.2019 | Potsdam-Institut für Klimafolgenforschung
Adjusting the thermal conductivity of materials is one of the challenges nanoscience is currently facing. Together with colleagues from the Netherlands and Spain, researchers from the University of Basel have shown that the atomic vibrations that determine heat generation in nanowires can be controlled through the arrangement of atoms alone. The scientists will publish the results shortly in the journal Nano Letters.
In the electronics and computer industry, components are becoming ever smaller and more powerful. However, there are problems with the heat generation. It is...
Scientists have visualised the electronic structure in a microelectronic device for the first time, opening up opportunities for finely-tuned high performance electronic devices.
Physicists from the University of Warwick and the University of Washington have developed a technique to measure the energy and momentum of electrons in...
Scientists at the University Würzburg and University Hospital of Würzburg found that megakaryocytes act as “bouncers” and thus modulate bone marrow niche properties and cell migration dynamics. The study was published in July in the Journal “Haematologica”.
Hematopoiesis is the process of forming blood cells, which occurs predominantly in the bone marrow. The bone marrow produces all types of blood cells: red...
For some phenomena in quantum many-body physics several competing theories exist. But which of them describes a quantum phenomenon best? A team of researchers from the Technical University of Munich (TUM) and Harvard University in the United States has now successfully deployed artificial neural networks for image analysis of quantum systems.
Is that a dog or a cat? Such a classification is a prime example of machine learning: artificial neural networks can be trained to analyze images by looking...
An international research group led by scientists from the University of Bayreuth has produced a previously unknown material: Rhenium nitride pernitride. Thanks to combining properties that were previously considered incompatible, it looks set to become highly attractive for technological applications. Indeed, it is a super-hard metallic conductor that can withstand extremely high pressures like a diamond. A process now developed in Bayreuth opens up the possibility of producing rhenium nitride pernitride and other technologically interesting materials in sufficiently large quantity for their properties characterisation. The new findings are presented in "Nature Communications".
The possibility of finding a compound that was metallically conductive, super-hard, and ultra-incompressible was long considered unlikely in science. It was...
24.06.2019 | Event News
29.04.2019 | Event News
17.04.2019 | Event News
19.07.2019 | Physics and Astronomy
19.07.2019 | Physics and Astronomy
19.07.2019 | Earth Sciences