The Volcano That Shrouded the Earth

January 3, 2016

Two hundred years ago, the greatest eruption in Earth’s recorded history took place. Mount Tambora—located on Sumbawa Island in the East Indies—blew itself up with apocalyptic force in April 1815.

After perhaps 1,000 years’ dormancy, the devastating evacuation and collapse required only a few days. It was the concentrated energy of this event that was to have the greatest human impact. By shooting its contents into the stratosphere with biblical force, Tambora ensured its volcanic gases reached sufficient height to disable the seasonal rhythms of the global climate system, throwing human communities worldwide into chaos.

The sun-dimming stratospheric aerosols produced by Tambora’s eruption in 1815 spawned the most devastating, sustained period of extreme weather seen on our planet in perhaps thousands of years.

Within weeks, Tambora’s stratospheric ash cloud circled the planet at the equator, from where it embarked on a slow-moving sabotage of the global climate system at all latitudes. Five months after the eruption, in September 1815, meteorological enthusiast Thomas Forster observed strange, spectacular sunsets over Tunbridge Wells near London. “Fair dry day,” he wrote in his weather diary—but “at sunset a fine red blush marked by diverging red and blue bars.”

Artists across Europe took note of the changed atmosphere. William Turner drew vivid red skyscapes that, in their coloristic abstraction, seem like an advertisement for the future of art. Meanwhile, from his studio on Greifswald Harbor in Germany, Caspar David Friedrich painted a sky with a chromic density that—one scientific study has found—corresponds to the “optical aerosol depth” of the colossal volcanic eruption that year.

For three years following Tambora’s explosion, to be alive, almost anywhere in the world, meant to be hungry. In New England, 1816 was nicknamed the “Year Without a Summer” or “Eighteen-Hundred-and-Froze-to-Death.” Germans called 1817 the “Year of the Beggar.” Across the globe, harvests perished in frost and drought or were washed away by flooding rains.

Villagers in Vermont survived on porcupine and boiled nettles, while the peasants of Yunnan in China sucked on white clay. Summer tourists traveling in France mistook beggars crowding the roads for armies on the march.

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