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    Home » Mystery of Crater Lakes in Sahara Mountains Solved by New Study
    Mystery

    Mystery of Crater Lakes in Sahara Mountains Solved by New Study

    morshediBy morshediAugust 19, 2025No Comments4 Mins Read
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    Mystery of Crater Lakes in Sahara Mountains Solved by New Study
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    Mystery of Crater Lakes in Sahara Mountains Solved by New Study
    Overview of Trou au Natron’s caldera from its summit. Credit score: Gerhard Holub / CC BY-SA 4.0

    A analysis staff has uncovered how deep lakes as soon as stuffed distant craters excessive within the Tibesti Mountains, providing new perception into local weather patterns in one of many driest areas on Earth. The scientists revealed that crater lakes within the Sahara mountains, now lengthy vanished, have been sustained by sudden rainfall patterns greater than 7,000 years in the past.

    The examine, printed in Nature Communications, was led by researchers from Freie Universität Berlin and the Max Planck Institute for Meteorology. It confirms that these lakes started forming over 9,500 years in the past and remained for greater than 5,000 years — a uncommon hydrological phenomenon in a area now referred to as a part of the huge Sahara Desert.

    The findings spotlight a pointy distinction between the present-day arid circumstances and the plush, lake-filled landscapes that existed through the North African Humid Interval. These shifts have been notably evident within the Tibesti area, situated in modern-day northern Chad, which rises dramatically above the encompassing plains.

    Historic expeditions and area analysis

    Historic curiosity within the space dates again to 1869, when German explorer Gustav Nachtigal first documented a deep volcanic crater at an elevation of about 2,500 meters (8,202 toes). Identified regionally as Doon Orei and in French as Trou au Natron, this crater was considered one of a number of that held freshwater lakes hundreds of years in the past.

    Extra not too long ago, geologist Stefan Kröpelin from the College of Cologne led area expeditions to Trou au Natron and the close by Period Kohor crater, situated inside the Emi Koussi caldera, which reaches an elevation of three,500 meters (11,483 toes).

    The staff collected sediment cores from the traditional lake beds and transported them to Germany for detailed evaluation, regardless of the area’s harsh climate and logistical challenges.

    On the Laboratory for Bodily Geography at Freie Universität Berlin, geochemists examined the sediment layers to reconstruct the historical past of the lakes.

    Philipp Hoelzmann, a geographer and one of many lead authors, defined that learning these well-preserved samples allowed the staff to trace how and when the lakes fashioned and disappeared.

    Superior local weather modeling supplies new insights

    The researchers prolonged their evaluation through the use of high-resolution paleoclimate fashions on the Max Planck Institute for Meteorology. These simulations, primarily based on information from round 7,000 years in the past, had a high quality spatial scale of roughly 5 kilometers (3.1 miles).

    Martin Claussen, head of the local weather modeling group, defined that this was the primary time scientists have been in a position to precisely simulate the steep terrain and rainfall behavior within the Tibesti area.

    Their outcomes confirmed that rainfall within the Sahara mountains was no less than ten instances larger within the Tibesti than within the surrounding lowlands. Opposite to earlier theories, the moisture originated not from the south by way of the West African monsoon however from the northeast.

    Winds from the Mediterranean transported moist air towards the highlands, the place the mountain slopes compelled the air upward, inflicting heavy precipitation that fed the crater lakes.

    Shifting theories on the Sahara’s local weather historical past

    The staff additionally utilized distant sensing and terrain evaluation to map the area’s hydrology. A numerical water stability mannequin supported their findings, displaying that these high-altitude lakes have been sustained by constant rainfall over the centuries.

    Researchers emphasised that these outcomes show the significance of high-resolution local weather modeling in reconstructing regional environmental adjustments.

    They are saying the identical strategies may show essential for understanding how landscapes just like the Sahara might reply to present and future local weather shifts.





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