Posted Date: 03/01/2019
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Sahara desert climate will face 20,000 years round.

Sahara desert climate will "face" 20,000 years round

Original title: New research: Sahara desert climate will "change face" 20,000 years round

American and French researchers have recently discovered that due to changes in the Earth's axis and monsoon activities, the climate in the Sahara Desert and the entire North African region is 20,000 years as a cycle, in humid and arid Change between.

A study published in the journal Science Progress on the 2nd shows that the earth's axis changes during the orbit around the sun, affecting the distribution of sunlight during the season, and the level of sunlight received by the earth in the summer every 20,000 years will change from high to high. Low and then return to high.

Specific to North Africa, the monsoon activity is most active in the summer when the sun is most abundant, when the Sahara desert has a moister climate and more lush vegetation; in the least abundant summer sun, the monsoon activity is the weakest, and the Sahara desert will be like today. drought.

In this new study, the researchers analyzed sand and dust deposits in the seabed sediments of the West African coast over the past 240,000 years. It was found that the dusty sand in the sedimentary layer indicates that the Sahara desert has a relatively dry climate in those years, and the wind is covered with more sand and dust deposited on the seabed. The less dust in the sedimentary layer indicates that the Sahara desert has a relatively humid climate. The analysis of the seabed sedimentary layer also shows that the climate of the Sahara desert cycles back and forth in a cycle of 20,000 years.

David McGee, co-author and co-author of the Department of Earth, Atmospheric and Planetary Sciences at the Massachusetts Institute of Technology, said that this is a useful time series that helps to understand the history of the Sahara Desert and determine when humans settled in the Sahara Desert and crossed It is out of Africa.

Sahara desert climate will change face 20,000 years round.


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