“I estimate that the influence of Bardarbunga eruption is nearly 1/4 to 1/3 of the similar eruption of Laki in 1783-84, says longtime reader DMH. My estimate is based on the total amount of lava of that eruption (~ 15 km3), and total duration (8 months).
It is also based on the 40,000 to 60,000 tons of SO2 per day pouring out of the volcano. That is a large amount, says DMH, who thinks it is already affecting the climate, at least in the Northern Hemisphere.
One factor that we must consider, says DMH, is that the tropopause is closer to the ground at higher latitudes,
Laki killed more than six million people globally
It’s historically recognized that Laki’s eruption of the XVIII century, had important effects on world’s climate, especially the Northern Hemisphere:
The Laki eruption and its aftermath caused a drop in global temperatures, as sulfur dioxide was spewed into the Northern Hemisphere. This caused crop failures in Europe and may have caused droughts in India. The eruption has been estimated to have killed over six million people globally, making the eruption the deadliest in historical times.
( https://en.wikipedia.org/wiki/Laki )
According to the above video,
Laki spewed out enough lava to engulf the city of Chicago
It hurled out millions of tons of ash and toxic gases, poisoning the soil and crops, the video points out. Three-quarters of all of Iceland’s sheep, and more than half its livestock, died from starvation.
The people soon followed.
May have lead to the French Revolution
The cloud from Laki engulfed a vast part of the northern hemisphere, and sulfuric aerosols blocked the sun’s heat, causing global temperatures to plummet.
The ensuing food shortages caused French peasants to rise up, arguably leading to the French Revolution of 1789.
In northeastern North America, the winter of 1783-84 was the longest, and the most severe, on record. It was so cold that people saw ice floes on the river in Mississippi.
With widespread crop failure, up to a 6th of Egypt’s population, and many more across India and North Africa.
Therefore, says DMH, I believe we should expect the same from Bardarbunga, although at lower levels of “climate cooling” per month of eruption.
I think DMH makes some very good points.