There is evidence of still another volcanic eruption in 547 which would have extended the cooler period. The lingering impact of the volcanic winter of 536 was augmented in 539–540, when another volcanic eruption caused summer temperatures to decline as much as 2.7 degrees Celsius (4.9 Fahrenheit degrees) below normal in Europe. Summer temperatures in 536 fell by as much as 2.5 degrees Celsius (4.5 Fahrenheit degrees) below normal in Europe. In March 536, Constantinople began experiencing darkened skies and cooler temperatures. Modern scholarship has determined that in early AD 536 (or possibly late 535), an eruption ejected massive amounts of sulfate aerosols into the atmosphere, which reduced the solar radiation reaching the Earth's surface and cooled the atmosphere for several years. Most contemporary accounts of the volcanic winter are from authors in Constantinople, the capital of the Eastern Roman Empire, although the impact of the cooler temperatures extended beyond Europe. The volcanic winter was caused by an eruption, with several possible locations proposed in various continents. The volcanic winter of 536 was the most severe and protracted episode of climatic cooling in the Northern Hemisphere in the last 2,000 years. Cooling period in Northern Hemisphere caused by volcanic eruptions
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