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New 'Little Ice Age' coincides with fall of Eastern Roman Empire and growth of Arab Empire
February 8, 2016 in Earth / Earth Sciences
Summer temperatures were reconstructed from tree rings in the Russian Altai (red) and the European Alps (blue). Horizontal bars, shadings and stars refer to major plague outbreaks, rising and falling empires, large-scale human migrations, and political turmoil. Credit: Past Global Changes International Project Office
Researchers from the international Past Global Changes (PAGES) project write in the journal Nature Geoscience that they have identified an unprecedented, long-lasting cooling in the northern hemisphere 1500 years ago. The drop in temperature immediately followed three large volcanic eruptions in quick succession in the years 536, 540 and 547 AD (also known as the Common Era CE). Volcanoes can cause climate cooling by ejecting large volumes of small particles - sulfate aerosols - that enter the atmosphere blocking sunlight.
Within five years of the onset of the "Late Antique Little Ice Age", as the researchers have dubbed it, the Justinian plague pandemic swept through the Mediterranean between 541 and 543 AD, striking Constantinople and killing millions of people in the following centuries. The authors suggest these events may have contributed to the decline of the eastern Roman Empire.
Lead author, dendroclimatologist Ulf Büntgen from the Swiss Federal Research Institute said, "This was the most dramatic cooling in the Northern Hemisphere in the past 2000 years."
A later "Little Ice Age" between 14th and 19th centuries has been well documented and linked to political upheavals and plague pandemics in Europe, but the new study is the first to provide a comprehensive climate analysis across both Central Asia and Europe during this earlier period.
"With so many variables, we must remain cautious about environmental cause and political effect, but it is striking how closely this climate change aligns with major upheavals across several regions," added Büntgen. ...
http://phys.org/news/2016-02-ice-age-coincides-fall-eastern.html
125-year mini ice age linked to the plague and fall of empires
https://www.newscientist.com/articl...paign=hoot&cmpid=SOC|NSNS|2016-GLOBAL-twitter
February 8, 2016 in Earth / Earth Sciences
Summer temperatures were reconstructed from tree rings in the Russian Altai (red) and the European Alps (blue). Horizontal bars, shadings and stars refer to major plague outbreaks, rising and falling empires, large-scale human migrations, and political turmoil. Credit: Past Global Changes International Project Office
Researchers from the international Past Global Changes (PAGES) project write in the journal Nature Geoscience that they have identified an unprecedented, long-lasting cooling in the northern hemisphere 1500 years ago. The drop in temperature immediately followed three large volcanic eruptions in quick succession in the years 536, 540 and 547 AD (also known as the Common Era CE). Volcanoes can cause climate cooling by ejecting large volumes of small particles - sulfate aerosols - that enter the atmosphere blocking sunlight.
Within five years of the onset of the "Late Antique Little Ice Age", as the researchers have dubbed it, the Justinian plague pandemic swept through the Mediterranean between 541 and 543 AD, striking Constantinople and killing millions of people in the following centuries. The authors suggest these events may have contributed to the decline of the eastern Roman Empire.
Lead author, dendroclimatologist Ulf Büntgen from the Swiss Federal Research Institute said, "This was the most dramatic cooling in the Northern Hemisphere in the past 2000 years."
A later "Little Ice Age" between 14th and 19th centuries has been well documented and linked to political upheavals and plague pandemics in Europe, but the new study is the first to provide a comprehensive climate analysis across both Central Asia and Europe during this earlier period.
"With so many variables, we must remain cautious about environmental cause and political effect, but it is striking how closely this climate change aligns with major upheavals across several regions," added Büntgen. ...
http://phys.org/news/2016-02-ice-age-coincides-fall-eastern.html
125-year mini ice age linked to the plague and fall of empires
https://www.newscientist.com/articl...paign=hoot&cmpid=SOC|NSNS|2016-GLOBAL-twitter