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Tuesday, May 23, 2017

Scientists have named an unexpected why the Sahara became a desert


Many people asked to say what they associate the Sahara desert, would call the word “heat” one of the first. However, a group of scientists from mit found out that it was the cold that occurred about five thousand years ago, made of Sugar, as it can be seen today.


photo: pixabay.com

The experts studied the traces of dust which the wind brings from the Sahara to North America and the Bahamas, overcoming part of the African continent and the Atlantic ocean. As a result, scientists were able to figure out how to change the amount of this dust over 23 thousand years. It turned out that in the period that began 11 million years ago and ended 5 million years ago, it was about two times less than now. Experts suggest that during this period the Sahara was much greener place than today and the water was much better. This is evidenced by some archaeological finds, previously exhibiting ancient fishing hooks in those parts of the Sahara which are now unfit for human life.

Starting from the changed amount of dust from the Sahara in the last Millennium, scientists found out how the grounds of the desert became such. As it turned out, Sahara sand reflect sunlight, which cools the sea surface near the desert by 0.15 degrees. This, in turn, sufficient to prevent precipitation and to force the cyclones to get around the wilderness side. While during the cold snap that occurred five thousand years ago, similar processes occurred naturally, according to the researchers, can explain the emergence of the desert. This itself is dust that experts have studied, is unlikely to play a significant role in this transformation.

The results of their study, the scientists presented in the journal Science Advances.

source

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