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The Sahara was ‘green’ for over 6,000 years and had 10 times more rain than now


Based on erosion marks, several researchers and geologists have suggested that the Great Sphinx was built thousands of years earlier than the official story suggests.




According to a new study recently published in the journal Science Advances, evidence shows that humans occupied much of the Sahara during the ‘wet period’ around 8,000 years ago.


根據科學進展期刊Science Advances最近刊登的新研究有證據顯示在大約8000 年前時人類在「濕期」佔據了撒哈拉的大部分地區。


Through an analysis of marine sediments, researchers at the University of Arizona have determined rainfall patterns in the Sahara over a period of 6,000 years obtaining fascinating results. The UA-led team has identified the climate pattern that generated a Green Sahara” from 5,000 to 11,000 years ago. The region had 10 times the rainfall it does today.

As it turns out, what is now the Sahara Desert was the home of hunter-gatherers who lived off the animals and plants present in the savannas of the region and off the wooded prairies sometime between 5,000 and 11,000 years ago.


根據對海洋沈積物的分析,亞利桑那大學的研究人員在撒哈拉測定出有趣的結果,也就是6000 年期間的降雨模式。這個由亞利桑那大學領導的團隊發現這個氣候模式在5000 11000 年前創造了一個「綠色撒哈拉」。那時這個地區有比現在多十倍的雨量。


5000 11000 年前,撒哈拉沙漠曾是狩獵採集者的家,他們靠這個地區的大草原上的動物和植物生活,也靠充滿樹林的草原生活。


It was 10 times as wet as today,” said lead author Jessica Tierney of the University of Arizona. Annual rainfall in the Sahara now ranges from about 4 inches to less than 1 inch (100 to 35 mm).

Although other research has already identified the existence of a Green Sahara” period, Tierney and colleagues managed to compile a continuous record of rainfall in the region that existed 25,000 years ago.

Interestingly, archaeological evidence shows that humans occupied much of the Sahara during the wet period, but gradually withdrew some 8,000 years ago.

Other researchers have suggested that the Sahara became drier by the time people left, but the evidence was inconclusive, says Tierney, an assistant professor of geosciences at the UA, whose work was published in Science Advances.


主筆作者,亞利桑那大學的Jessica Tierney 說:「它曾比今日要濕上十倍。」現在撒哈拉的全年降雨量大約是4英寸1 英寸以下100 35 公釐


雖然其他的研究已經確認了「綠色撒哈拉」時期的存在,Tierney和同事們打算編輯一份撒哈拉地區25000 年前的持續降雨記錄。有趣的是,考古證據顯示人類在濕期佔據了撒哈拉的大部分地區,但是在約  8000 年前時逐漸撤離。亞利桑那大學地球科學的助理教授Tierney的研究被刊登在科學進展期刊上,他說:「其他研究人員認為撒哈拉在人們撤離的時期變得乾燥,但是缺乏證據。」

The Sahara Desert is the warmest in the world and the third largest after Antarctica and the Arctic.


According to the new study, rainfall records gathered by the team indicate a period that lasted for one thousand years, some 8,000 years ago, in which the Sahara became drier, which coincides with the time when people left.






It looks like this thousand-year dry period caused people to leave,” Tierney said.

What’s interesting is the people who came back after the dry period were different — most raised cattle. That dry period separates two different cultures. Our record provides a climate context for this change in occupation and lifestyle in the western Sahara.”

According to UA News, Instead of lake sediments, Tierney and her colleagues used cores of marine sediments taken off the coast of West Africa at four different sites. Because the cores were taken over a north-south distance of about 800 miles (1,300 km) — from offshore Cape Ghir, Morocco, to the northwestern corner of Mauritania — the cores revealed both the ancient rainfall patterns and the areal extent of the Green Sahara.




根據亞利桑那大學新聞,Tierney和他的同事不使用湖泊沈積物,而是使用西非海岸的四個不同地點的海洋沈積物的岩心。這些岩心的採集地從北到南橫跨八百英里(1300 公里),從摩洛哥的Cape Ghir海岸到毛里塔尼亞的西北角,這些岩心顯示了古時的降雨模式,也透露的綠色撒哈拉的區域範圍。