- Volcanic winter
A volcanic winter is the reduction in temperature caused by
volcanic ashand droplets of sulfuric acidobscuring the sunand lowering the albedo(increasing the Earth's reflectivity), during a large particularly explosive type of volcanic eruption. Long term cooling effects are primarily dependent upon injection of sulfidecompounds in aerosolforms into the upper atmosphere—the stratosphere— the highest least active levels of the lower atmosphere where little precipitation occurs requiring a lengthy time to wash the aerosols out of the region.
Recent cases of volcanic winter
The scales of recent winters are more modest but their effects can be significant. A paper written by
Benjamin Franklinin 1783 blamed the unusually cool summer of 1783 on volcanic dust coming from Iceland, where the eruption of Lakivolcano had released enormous amounts of sulfur dioxide, resulting in the death of much of the island's livestockand a catastrophic faminewhich killed a quarter of the population. Temperatures in the northern hemispheredropped by about 1 °C in the year following the Laki eruption.
extreme weather events of 535-536are most likely linked to a volcanic eruption.
1452or 1453, a cataclysmic eruption of the submarine volcano Kuwaecaused worldwide disruptions.
1600, the Huaynaputinain Peruerupted. Tree ring studies show that 1601 was cold. Russiahad its worst famine in 1601 to 1603. From 1600 to 1602, Switzerland, Latviaand Estoniahad exceptionally cold winters. The wine harvest was late in 1601 in France, and in Peru and Germanywine production collapsed. Peach trees bloomed late in China, and Lake Suwain Japanfroze early [http://www.sciencedaily.com/releases/2008/04/080423135236.htm University of California - Davis (2008, April 25). Volcanic Eruption Of 1600 Caused Global Disruption. ScienceDaily. Retrieved April 25, 2008] .
The 1815 eruption of
Mount Tambora, a stratovolcanoin Indonesia, occasioned mid-summer frosts in New York Stateand June snowfalls in New Englandin what came to be known as the " Year Without a Summer" of 1816.
In 1883, the
explosionof Krakatoa(Krakatau) also created volcanic winter-like conditions. The next four years after the explosion were unusually cold, and the winter of 1888 was the first time snow fell in the area. Record snowfalls were recorded worldwide.
Most recently, the 1991 explosion of
Mount Pinatubo, another stratovolcano in the Philippines, cooled global temperatures for about 2–3 years. [ [cite journal|author=Brohan, P., J.J. Kennedy, I. Haris, S.F.B. Tett and P.D. Jones|year=2006|title=Uncertainty estimates in regional and global observed temperature changes: a new dataset from 1850|journal=J. Geophysical Research|volume=111|pages=D12106|doi=10.1029/2005JD006548] ]
Ancient case of volcanic winters
One proposed volcanic winter happened around 71,000–73,000 years ago following the supereruption of
Lake Tobaon Sumatraisland in Indonesia. In the following 6 years there was the highest amount of volcanic sulphur deposited in the last 110,000 years, possibly causing significant deforestationin Southeast Asiaand the cooling of global temperatures by 1 °C. [ C. Oppenheimer, 2002, Limited global change due to the largest known Quaternary eruption, Toba ~~ 74 Kyr BP, Quaternary Science Reviews, 21, 1593-1609 ] Some scientists hypothesize the eruption caused an immediate return to a glacial climate regime by accelerating an ongoing continental glaciation, thereby causing massive population reduction among animals and human beings on Earth. Others argue that the climatic effects of the eruption were too weak and brief to impact early human populations to the degree proposed. [ Oppenheimer (2002) ]
This, combined with the fact that most human differentiations abruptly occurred at that same period, is a probable case of bottleneck linked to volcanic winters (see
Toba catastrophe theory). On average, super-eruptions with total eruptive masses of at least 1015 kg (Toba eruptive mass = 6.9 × 1015 kg) occur every 1 million years.Cite Sm| B.G. Mason, D.M. Pyle, and C. Oppenheimer, 2004, The size and frequency of the largest explosive eruptions on Earth, The Bulletin of Volcanology, 66 (8), 735-748. ]
Effects on life
The causes of the bottleneck phenomenon, i.e., a sharp decrease in a
species' population immediately followed by a period of great genetic divergence ( differentiation) among survivors—is attributed to volcanic winters by some researchers. The geologic and genealogical records indicates that the eruption of the super volcano Mt. Toba (now Lake Toba, a caldera). According to anthropologist Stanley Ambrose, such events diminish the population size to "levels low enough for evolutionary changes, which occur much faster in small populations, to produce rapid population differentiation". In the Toba bottleneck, many species show massive effects of narrowing of the gene pool, and it is believed Toba nearly caused mankind to go extinct.
*cite journal | author = MR Rampino, S Self & RB Stothers | year = 1988 | title = Volcanic winters | journal = Annual Review of Earth and Planetary Science | volume = 16 | pages = 73–99 | doi = 10.1146/annurev.ea.16.050188.000445
*C. Oppenheimer, 2002, Limited global change due to the largest known Quaternary eruption, Toba ~~ 74 Kyr BP, Quaternary Science Reviews, 21, 1593-1609.
Climate changes of 535-536
Year Without a Summer
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