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Despite the accumulation of archaeological data on Neanderthals in recent years, which allowed archaeologists and anthropologists to draw a more precise picture of this ancient people, the reasons for the disappearance of the Neanderthals are still uncertain. Based on geophysical and atmospheric records dating back more than 40000 years, researchers recently suggested that this disappearance could be partly due to the consequences of the reversal of the magnetic poles of the Earth.
Researchers claim that the displacement of the Earth's magnetic poles, combined with the decline in solar activity there is 42 000 years, may have created a terrifying environment that could have played a role in major events, from the extinction of megafauna to the late Neanderthals. p>
Earth's magnetic field acts as a protective shield against harmful cosmic radiation, but when the poles change, as he has done several times in the past, the protective shield weakens considerably and leaves the planet exposed to high energy particles
Temporary pole reversal, known as the Laschamps flight, happened ago 42 000 years and lasted approximately 1 000 years. Previous work found little evidence that the event had a profound effect on the planet, maybe because the emphasis was not on the poles actually moving, according to To study
Scientists now claim that reflection, associated with a period of low solar activity, could be the cause of a wide range of climatic and environmental phenomena with dramatic implications. “It may have seemed like the end of the world”, says Professor Chris Tierney of the University of New South Wales.
The team called this period «the Adams event», a reference to Douglas Adams, author of the Intergalactic Traveler's Handbook, car «42 was seen as an answer to the ultimate question of life». In the journal Science, Tierney and colleagues describe how they performed radiocarbon analyzes of ancient curies rings preserved in the wetlands of northern New Zealand, some of which have more than 42 000 years.
This allowed them to keep up with the increase in carbon levels 14 in the atmosphere over time, which results from increased levels of high energy cosmic radiation reaching Earth during the flight of the Fields and, Therefore, they were able to date the atmosphere changes in more detail than they did. Provided by previous documents, such as mineral deposits
They then examined numerous sites and materials around the world., including the heart of the lake and the ice, and discovered that a series of major environmental changes occur when carbon levels 14 were reaching a mountain top. “We see this massive growth of the North American ice cap. ” We see the tropical rain belts in the western Pacific changing dramatically at this point, then also the wind belts in the Southern Ocean and the droughts in Australia », says Turney.
The researchers also used a model to examine how the chemistry of the atmosphere might change if the Earth's magnetic field were to decline and there was an extended period of reduced solar activity., which could further reduce the protection of the Earth. Earth against cosmic radiation
Analyzes of ice cores indicate that such a decrease in solar activity, known as “Grand Soleil Minimum”, coincided with the trip of the Fields. Results reveal that changes in the atmosphere could lead to massive climate change, thunderstorms and northern lights on the scale. Large
In addition to environmental changes that could accelerate the growth of ice caps and contribute to the extinction of Australian megafauna, the team suggests that this could also be linked to the appearance of red ocher handprints, assuming humans used the dye as a sunscreen against the increasing levels of ultraviolet rays hitting the Earth due to the depletion of the ozone layer
They also suggest that the increase in the use of caves by our ancestors during this period, as well as the height of the rock art, could be due to underground spaces providing shelter from harsh conditions The situation may also have fueled competition, who can contribute to the end of the Neanderthals
The Earth's magnetic field has weakened by about 9% during 170 last years, and researchers say another reversal can be considered. Richard Horn, responsible for space, weather and atmosphere in the British Antarctic Survey, said the chemical changes in the upper atmosphere that predicted the study matched what was measured at the Halley research station in Antarctica during vigorous but short-lived events in which they are vital. Particles emitted by the Sun
Anders Svenson of the University of Copenhagen, however, says ice samples from Greenland and Antarctica show no evidence of dramatic climate change during the Field Voyage era., but that this does not exclude the effect of “changes in the ozone layer and the effect of an increase.” Ultraviolet rays on humans is not something we can confirm or reject from the ice core. ”
Chris Stringer, who studies human origins at the Natural History Museum in London, says the work was important to show that the increased use of caves as shelters is reasonable, but the link with the increase in rock art is less convincing, because paintings of pigs seem to have been made in Sulawesi, in indonesia. Long before the trip to La Champagne
«The authors also associate the physical extinction of Neanderthals ago 40 000 years, and I think it certainly contributed to their demise. But they lived longer and spread more widely than Europe alone, and we have a very bad idea of when they finally disappeared in parts of Asia », concludes Stringer.
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News – WITH – The disappearance of the Neanderthals could be linked to the reversal of the magnetic poles
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– The disappearance of the Neanderthals may be linked to the reflection of the poles
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