About desert phenomena, strange phenomena in the desert

The story of the desert.

On January 7, 2001, the Beijing Evening News published the following news on the 12th page of the "China News" column, speculating on what kind of phenomenon this might be?

The rare weather in the Luobu Desert in Xinjiang stunned the experts of the scientific expedition team.

Strange and weird, the snow fell all over the sky and disappeared in an instant.

The temperature has been minus 14 degrees, the sky is not sunny, and the sand is loose after the snow melts.

Xinjiang News The strange weather phenomenon that has occurred in the Luobu Desert recently has puzzled the experts in the scientific expedition team.

From around 3 a.m. on January 4, snow began to fall in the Lobu Desert until 12 noon the next day, when the expedition team reached about 200 meters in front of Xiaohemo, when the snow suddenly stopped, and the sand dunes were evenly covered with about 5 to 10 centimeters of snow.

However, after 20 minutes or so, something strange happened; Just when the scientific expedition team hurriedly unloaded the equipment from the ATV and began to approach the Xiaohe cemetery, it was no longer the snow that happened under their feet, but the dry sand.

"This is the driest region in China, with an average annual precipitation of 13 millimeters and evaporation of up to 4,000 millimeters ......," said Xia Xuncheng, a researcher at the Xinjiang Institute of Ecology and Geography of the Chinese Academy of SciencesWhy is this snow gone in a blink of an eye? I haven't figured it out ...... yet

There is a kind of "gravel circle" in the desert that is wonderful. It is a large stone that has been broken again and again after hundreds of years of thermal expansion and contraction, forming a circular circle of gravel on the ground, which is very much like a work arranged by man, and is actually formed naturally.

The object is bent and deformed.

Fried eggs can be found on the sand.

1. Quicksand is sand that can flow like old nuclear liquid, that is, sand that can flow. is a natural phenomenon. It often occurs in deserts with unstable foundations, when a heavy object is placed on top of the sand, as if it sinks to the bottom, sinking to the bottom.

2. Sandstorm refers to a serious wind-blown sandstorm phenomenon in which a large amount of sandstorm material on the ground is blown up by strong winds and swept into the air, making the air particularly turbid and the horizontal visibility is less than 1,000 meters dug by the guard. <

1. Quicksand is sand that can flow like a liquid, that is, sand that can flow. is a natural phenomenon. It often occurs in deserts with unstable foundations, when a heavy object is placed on top of the sand, as if it sinks to the bottom, sinking to the bottom.

2. Sandstorm refers to the phenomenon of severe wind-blown sand and dry air in which a large amount of sand and dust materials on the ground are blown up by strong winds and swept into the air, making the air particularly turbid and the horizontal visibility is less than 1,000 meters. Sandstorms refer to sandstorms formed by strong winds blowing a large amount of sand into near-surface formations. A dust storm is a storm formed by high winds that sweep large amounts of dust and other fine particles into the air.

3. The gravel circle is a large stone that has been broken again and again after hundreds of years of thermal expansion and cold contraction, forming a circular gravel circle on the ground, which is very similar to the works arranged by man, and is actually formed naturally.

4. Wear a leather jacket in the morning and wear yarn in the afternoon because the specific heat capacity of the stone is large, which causes a drastic change in the temperature difference between day and night. It was cold in the morning and hot at noon. However, the coastal area is close to the water, the specific heat capacity of the water is larger, and the same amount of solar radiation is also affected, and the water has to absorb more heat and release the heat at night.

5. The sea of the devil, the sun is scorching during the day, the sand and gravel absorb heat quickly, the air close to the ground heats up quickly and the density is small, while the upper air heats slowly and has a high density. Whenever there is no wind or breeze, because the air is not stirred, the heat exchange between the upper and lower air is very small, and the abnormal phenomenon of cool and dense air in the upper layer and hot and thin air in the lower layer appears.

One-third of the Earth's land is completely covered with sand, and vegetation and rainwater are very sparse. Due to the scarcity of water, deserts are generally barren and inaccessible. Although there is not much life in the desert compared to other lands, there are still many plants hidden in it, and there are animals that only come out at night.

Deserts are generally wind-formed, and most of them are sandy beaches and dunes, and there are often rocks under the sand. In addition, the soil in the desert is very thin, there are few plants, and some deserts are still salt flats, and there is no vegetation at all.

Although the distribution of plants in the desert is relatively small, there are still many species, such as desert red willow, which are resistant to drought or salt. It also rarely rains in the center of the desert, and the desert is often fed by rivers that flow from the nearby mountains, and although these rivers carry a lot of earth, they dry up after a day or two of flowing in the desert. But occasionally it rains in the desert, often in torrential rains, and at this time, the normally dry rivers fill up quickly and are prone to flooding.

If there is enough water in the desert, seasonal lakes are formed, which are generally shallow and salty. Because the bottom of the lake is very flat, the wind will blow the lake away for dozens of square kilometers, and when the dry lake dries, a salt flat will be left.

There are also several strange phenomena in the desert, and mirages are one of them. A mirage is a natural phenomenon formed by the refraction of light, that is to say something that is ethereal and does not actually exist. The mirage can be seen occasionally in the desert, it is the true embodiment of another space, reflected in another space under the movement of matter.

Mirages often occur after rain due to the high humidity of the air at this time, which forms a lens system.

When the temperature near the ground in the desert changes drastically, the density of the atmosphere varies greatly, and the distant scenery causes a mirage when the light is propagated, abnormal refraction and total reflection occur.

The mirage is divided into upper, lower and lateral mirage, the sand and gravel in the desert are hot by the sun during the day, and the air will rise quickly when approaching the sand layer, thus forming the temperature distribution of the upper layer is cold and the lower layer is hot, and the density of the upper layer is greater than that of the lower layer. The light of the scene in front of you will be refracted by the dense penetrating air to the less dense air, thus forming a mirage. Viewed from a distance, it looks like a reflection in the water.

If a person is thirsty in the desert and sees a mirage, he will mistakenly think that he has found an oasis, but after a gust of wind, the scene disappears again, and it is nothing more than a mirage.

Although the mirage is beautiful, desertification is caused by natural drying factors and excessive animal husbandry, so keeping the land moist can only be reversed by allowing the moisture retention to be greater than the dryness.

One of the strange phenomena: "wear a leather jacket in the morning and wear a yarn in the afternoon". Because the specific heat capacity of the stone is large, the temperature difference between day and night changes drastically.

Strange phenomenon 2: Singing sand, that is, sand that can make sounds. The basic principle of sand singing is the movement of air between the sand grains, and when the sand is sliding, the pores between them will expand and shrink.

Air penetrates these pores and is squeezed out of them, causing them to vibrate and make sounds.

Strange phenomenon No. 3: "Gravel Circle". The "gravel circle" in the desert looks very much like an artificially arranged work, but in fact, it is a large stone that has been broken again and again after hundreds of years of thermal expansion and contraction, forming a circular gravel circle on the ground, which is actually formed naturally.

For details, see Eighty Languages 11 Strange Phenomena in the Desert.

Mirage, deathly silence. The temperature difference between day and night is large, and at the same time, it is also full of mystery and unpredictability.