libyan desert temperature

In winter, the weather is cool with some rain on the coast and in the desert the temperature can drop to sub-freezing at night. The highest temperature ever recorded on Earth was 136 Fahrenheit (58 Celsius) in the Libyan desert. Like a nuclear bomb, a large airburst deposits energy into the atmosphere that can melt surface materials. We examined zircon grains from seven samples and the critical crystal orientation evidence of former reidite was present in each sample.Reidite is rare and only reported from meteorite impact sites. • Body temperatures were consistent during the winter, with no use of torpor. Like most of the Sahara, this desert is primarily The desert features a striking diversity of landscapes including mountains, oases, and sand seas. The heat is on Studies show the Libyan desert glass formed about 29 million years ago. At low shock intensity, zircon deforms by bending of the crystal. Its climate is surprisingly variable, being hot in summer, with average daytime temperatures of 50 °C (122 °F) and above, though this drops rapidly at night. And we found the reidite fingerprint in samples of the Libyan desert glass. Within Libya five different climatic zones have been recognized, but the dominant climatic influences are Mediterranean and Saharan. One problem is that no impact crater from any object hitting the ground in the area has been identified as the source of the glass. A recrystallized zircon with no history of reidite would be the same color.Society going viral!

Similar to turning a Rubik’s cube, the initial transformation to reidite occurs along specific directions in a zircon crystal. Studies show the Libyan desert glass formed about 29 million years ago. Libyan desert glass is the name given to fragments of canary-yellow glass found scattered over hundreds of kilometres, between giant shifting sand dunes. It is like bending a plastic spoon to the point where it deforms but does not break.As the shock intensity increases, zircon further responds in several unique ways and at extreme pressures, reidite forms.

The Conversation UK receives funding from these organisationsIn the remote desert of western Egypt, near the Libyan border, lie clues to an ancient cosmic cataclysm. At Uweinat, as of 2006 the last recorded rainfall was in September 1998. But the thing is, reidite is no longer present.Reidite is not stable when hot, and reverts back to zircon above 1,200℃. In places, decades may pass without seeing any rainfall at all, and even in the highlands rainfall seldom happens, once every 5–10 years.

Meteorite impacts and airbursts are both catastrophic events. At these times the formation of hoar frost is not uncommon, and are known as "White Nights".

The Libyan desert is said to be one of the least hospitable regions on Earth. Our research has found the answer.

At these times the formation of In the north, along the Mediterranean shore, cool onshore winds blow inland, while further south, hot, dry winds, known as Historically, "Libya" referred to an ill-defined area to the west of Following the conquest of the territory by Italy during the During the 1930s the Libyan desert was the scene of exploration and mapping by the Italian Army and Air Force. The glass is nearly pure silica, which requires temperatures above 1,600℃ to form, and that is hotter than any igneous rock on Earth. In winter, days are cool, with temperatures averaging 27 °C (81 °F), but at night this can drop below freezing, with temperatures of −9 °C (16 °F) recorded. It is widely used for dating when rocks formed.Zircon is also useful when searching for evidence of shock deformation caused by a meteorite impact. So it takes a specialised technique called electron backscatter diffraction to nut out whether reidite once existed in shocked zircons that got hot. Reidite only forms during a meteorite impact, when atoms in the mineral zircon are forced into a tighter arrangement.Such high-pressure minerals are a hallmark of a meteorite impact, and do not form during airbursts.Zircon is a common mineral in granite, sandstone and other rock types. While most reacted to zirconia due to the heat, about 10% preserve evidence of former reidite. The desert covers an area of approximately 1,100,000 square kilometres (420,000 sq mi), and extends approximately 1,100 km from east to west, and 1,000 km from north to south, in about the shape of a rectangle slanting to the south-east. But few mineral relics survived from whatever caused the melting. And an airburst does not leave a crater.The new “smoking gun” for understanding the origin of the Libyan desert glass is evidence of an unusual mineral called reidite.

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