Several Glaciologist worries that he possibly will have establish clues that show history repeating itself, and if they are right, the conclusion could have important implications to modern society.
This Glaciologist has spent there career trekking to the far corners of the world to find remote ice fields and then produce back cores drilled from their centers. Within those cores are the records of earliest climate from across the globe.
From the mountains of data drawn by analyzing countless ice cores, and a meticulous evaluation of sometimes obscure historic records, The Glaciologist and his study team at Ohio State University are firm that the global climate has changed dramatically.
Excluding more significantly, they believe it has happened at least once before, and the results was nearly catastrophic to emerging cultures at the time. He outlined his interpretations and fears today at the annual meeting of the American Geophysical Union in San Francisco.
A professor of geological sciences at Ohio State and a researcher with the Byrd Polar Research Center, The Glaciologist points to markers in numerous records suggesting that the climate was altered suddenly several 5,200 years ago with severe impacts.
Probably, factors to perfectly preserved plants probably, discovered that recently emerged from the Quelccaya ice cap in the Peruvian Andes as that glacier retreats. This monstrous glacier, several 551 feet (168 meters) deep, has publicized an exponentially increasing rate of retreat since his first observations in 1963.
The plants were being carbon-dated to determine their age and tests indicated they was buried by the ice for maybe 5,200 years. That suggests that somehow, the climate had shifted suddenly and severely to capture the plants and preserve them until now.
In 1991, hikers establish the preserved body of a man trapped in an Alpine glacier and freed as it retreated. Later tests showed that the human - dubbed Oetzi - became trapped and died around 5,200 years ago.
The Glaciologist factors to a study of tree rings from Ireland and England that span a period of 7,000 years. The point in that record when the tree rings were being narrowest - suggesting the driest age experienced by the trees - was approximately 5,200 years ago.
He points to ice core records showing the ratio of two oxygen isotopes retrieved from the ice fields atop Africa's Mount Kilimanjaro. A proxy for atmospheric temperature at the occasion snow fell; the records are at their lowest 5,200 years before now.
They lists the shift by the Sahara Desert from a habitable region to a barren desert; most important changes in plant pollen discovered from lakebed cores in South America, and the record lowest levels of methane retrieved from ice cores from Greenland and Antarctica and all occurred at the same occasion - 5,200 years ago.
Something happened back at this instance and it was monumental. Excluding it didn't seem monumental to humans then because there was only around 250 million people occupying the planet, compared to the 6.4 billion we now have.
The impact of a climate change of that magnitude on a modern world would be tremendous, he said. Seventy percent of the population lives in the world's tropics and major climate changes would directly impact most of them.
The Glaciologist believes that the 5,200-year old event might have been caused by a dramatic fluctuation in solar energy reaching the earth. Scientists know that a historic global cooling called the Little Ice Age, from 1450 to 1850 A.D., coincided with two periods of decreased solar activity.
evince shows that around 5,200 years ago, solar output first dropped precipitously and then surged over a short period. It is this huge the climate change he sees in all those records.
The confirmation clearly points back to this point in history and to several event that occurred. It also points to similar changes occurring in today's climate as well in 2012.
solar energy oscillation that Glaciologist believes possibly will have triggered
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