How a volcano short-circuited Earth’s ionosphere to trigger “Year Without A Summer”
‘The 1815 eruption of Mount Tambora was one of the most powerful in recorded history, with a Volcanic Explosivity Index (VEI) of 7’, says Wikipedia.
The unusually cold year of 1816 has been linked to one of the most powerful volcanic eruptions in recorded history, and now we may know how, says New Atlas.
A new paper explains how electrified ash from the eruption could have “short-circuited” the Earth’s ionosphere and triggered the “Year Without A Summer.”
The year 1816 was a weird one, climatically speaking. Months that would normally be warm and pleasant were cold, rainy and overcast, leading to crop shortages across much of the Northern Hemisphere.
A new paper out of Imperial College London explains how electrified ash from the eruption could have “short-circuited” the Earth’s ionosphere and triggered the “Year Without A Summer.”
In April 1815, Mount Tambora, in what is now Indonesia, blew its lid. After a few months of rumbling and smoking away, it finally erupted with a Volcanic Explosivity Index (VEI) of 7, the largest volcanic eruption since the year 180 CE, with the explosion reportedly heard from as far as 2,600 km (1,600 mi) away.
Most importantly, the eruption launched about 10 billion tonnes of material into the atmosphere. Over the next year, this heavy ash cloud blanketed the Earth, reflecting sunlight and significantly reducing temperatures. Rain and snow fell in areas that should have been basking in summery weather, and almost 100,000 people are believed to have died as a result of the food shortage that followed.
Although the link was made between that eruption and the Year Without A Summer long ago, exactly what mechanisms were at play have remained a mystery. The Imperial College London study aimed to help explain how this dramatic climate event played out.
“Previously, geologists thought that volcanic ash gets trapped in the lower atmosphere, because volcanic plumes rise buoyantly,” says Matthew Genge, lead author on the study. “My research, however, shows that ash can be shot into the upper atmosphere by electrical forces.”
Continued here.
Research article (abstract): Electrostatic levitation of volcanic ash into the ionosphere and its abrupt effect on climate
Source: https://tallbloke.wordpress.com/2018/08/23/how-a-volcano-short-circuited-earths-ionosphere-to-trigger-year-without-a-summer/
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