What is a tree hanging ? How tree hangings are formed

Wusong and Yusong are commonly known as "tree hanging". In the cold winter, when there is fog near the ground, and the temperature of the small water droplets in the fog is below 0, some tree branches, power lines or protruding parts of objects near the ground have milky white condensation similar to frost, which is foggy.

There are two types of fog songs. One is that the supercooled fog droplets quickly freeze into granular Xiaoice blocks after hitting the cold ground object, called granular fog song, which is relatively compact. The other is a crystalline fog formed by the condensation of supercooled droplets, which has a loose structure and will fall off if there is a slight vibration.

If there is an inversion layer near the ground, that is, the temperature has a gradual increasing trend from the ground to the air, then when the supercooled raindrops in the cloud fall to the ground with a temperature lower than 0 and on the branches, wires and other objects, they will immediately freeze into transparent or translucent ice, so that the branches or wires will become thick popsicles, and sometimes they will drip and freeze at the same time, forming long icicles, which is the rain song. Yusong is also called ice and tree condensation, and the rain that forms Yusong is called freezing rain.

In most parts of the country, rain occurs from December to March of the following year. The place with the most rain is Mount Emei in Sichuan.

The average number of days per year is 167 days. The place where Wusong appears most is in Changbai Mountain, Jilin Province.

The average number of days per year is 187 days.

Severe rain can break tree branches, crops, and power lines, affecting traffic. Such as Chengde, Hebei.

On October 27 and 28, 1977, there was a rare rainstorm that broke more than 600,000 trees.

Rime, commonly known as tree hanging, is a milky white ice crystal deposit directly frozen on objects by water vapor in the air at low temperatures, or supercooled droplets, which is a very rare natural wonder. The rime is not ice or snow, but is the result of the accumulation of frozen stickiness on tree branches and other objects with the wind due to the countless water vapor in the fog that has not yet condensed below zero degrees Celsius, and appears as a white opaque granular structure deposit. The formation of rime requires a very low temperature and sufficient water vapor, and it is even more rare to have these two extremely important but contradictory natural conditions for the formation of rime.

The word "rime" first appeared in the "Zilin" compiled by Song Lü Chen (420-479 AD) in the Northern and Southern Dynasties, which was explained as: "The cold air freezes like a pearl and the sun disappears, and Qilu calls it rime." This is the earliest recorded word for "rime".

Rime, commonly known as ice flowers, tree hanging, etc., is a milky white ice crystal deposit directly frozen on the object by water vapor in the air when the low temperature is noisy, or supercooled fog droplets directly frozen on the object, which is a very rare natural wonder. The rime is neither ice nor snow, but due to the countless zero degrees Celsius in the fog.

The following water vapor has not yet condensed.

As a result of the accumulation of freeze stickiness on tree branches and other objects with the wind, it appears as a white, opaque granular structure deposit.

The formation of rime requires a very low temperature and sufficient water vapor, and it is even more rare to have these two extremely important and contradictory natural conditions for the formation of rime at the same time.

Principle of formation:

The conditions for the formation of rime are harsh. First of all, it requires both a long and cold winter and an abundance of moisture in the air. Secondly, the formation of rime requires both sunny and cloudy skies, quiet winds, or very low wind speeds.

When there are clouds at night, the outward long-wave radiation is weakened, so that the temperature of the land returns to the ground lowers slowly, and the temperature difference between day and night is relatively small, so that the water vapor in the air near the ground will not condense.

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Analysis: Tree hanging "late."

The tree hanging is also called silver branches, water vapor flowers, ice flowers Qiru, fog ice, meteorologically called fog song.

"Tree hanging" is the ice crystals that fog vapor and water vapor condense on the branches and leaves, which are divided into two types: granular and crystalline. The granular rime has a compact structure, forming a small grain of ice, while the crystalline rime has a loose structure and is a large sheet.

"Fog Song" fog is generally divided into two categories: granular fog and crystalline fog. Granular fog song, also known as dense fog song. It is formed by supercooled fog droplets and water droplets moving with the wind and quickly condensing when they encounter objects.

This kind of fog is formed by the overlap of some undulating Xiaoice balls, which is snow-white, dense, and can be firmly attached to objects, so this kind of fog is easy to break wires and branches, causing disasters. Another type of crystal fog, also known as sparse fog, is due to the severe cold weather, resulting in the air being supersaturated, and the water vapor is directly condensed (the gaseous state directly becomes a solid state, without going through the physical process of the liquid state, it is called condensation in meteorology). This kind of fog is connected by countless Xiaoice crystals, which is conducive to its generation in sunny days, gentle winds, strong cooling, and small fog droplets; Generally, the growth rate is slow, the density is small, and the structure is loose.

1. The rime is completely opaque white. The rime is light and white, attached to the tree objects, like the silver flower of the Qiong tree, delicate and elegant, this is the tree hanging.

2. The rime is thick, the sky and the clouds and the mountains and the water, up and down are white. The shadow on the lake, only a trace of the causeway, a little pavilion in the center of the lake, a mustard with the rest of the boat, and two or three people in the boat.

3. In spring, the hundred streams contend, the peaks spit green, the summer appreciates the fog and the clouds fall, the flowers bloom and the green trees, the autumn solstice travels all over the mountains and red leaves, the flowers fall on the branches, the ice and snow fly in the cold winter, and the jade tree is broken.

4. In the misty clouds, the mountains and ridges compete with each other. Songtao heard the song, and the sea of clouds shook his chest. Accompany me and ask who is the same, three or five idle cranes, one or two declining men.

5. Sudden winter snow, fluttering sprinkled for a day and a night, after the snow stopped, step out of the house with scaly tiles, white coral-like trees hanging, look at other peaks in the distance, the jade dragon-like mountains, it is really a dazzling jade carving.

6. The rime is as thick as a sorghum head, and seeing such a good rime will definitely make you smile.

7. Gray fog shrouded the city, everything was decorated with a layer of white, and the trees and wires looked shaggy.

8. The morning mist is like a milky white tulle, like a dream, a fantasy, a poem, a picture, which can't be waved away, can't be torn apart, and is constantly chopped, blocking my sight and making people feel like they want to return by the clouds.

9. The milky white mist, overflowing one by one in the valley, slowly overflowed the hillside, scattered into a soft tulle, fluttering and enveloping the entire mountain village.

10. The rime has the characteristics of "beauty, charm, softness and transparency", which is very ornamental. She covers a large area in all directions, and has the great beauty of decorating the country and the city.

11. Hanging in the weeping willows, swaying in the wind, graceful, charming and affectionate. The rime flowers are soft and white, spotless, like a gentle girl, Chu Chu is moving. Crystal clear and unique.

13. On the ten-mile embankment on the bank of the Songhua River, the white and crystal frost flowers are all over the branches, and under the sunshine, the silver light flashes, beautiful and moving, this is the wonder of Jilin rime.

14. The wonders of Jilin rime with all directions and unique charm make an endless stream of Chinese and foreign tourists praise.

15. In the misty clouds, the mountains compete with each other. Songtao heard the song, and the sea of clouds shook his chest. Accompany me and ask who is the same, three or five idle cranes, one or two declining men.

In the cold north, near surface water (rivers, lakes, etc.), water evaporates from the surface of the lake, forming a mist in the air, and because of the cold air, the water particles in the fog condense, frost and accumulate on the branches, and the branches are covered with a white opaque coat composed of Xiaoice crystals, creating a landscape similar to that after snow, which is very beautiful, like a pear blossom in full bloom.

It is naturally formed in the unique geographical environment of Jilin City. From Jilin city traced the Songhua River up 15 kilometers is the Fengman Hydropower Station, the river water passes through the water turbine unit in winter, the water temperature rises and warms, the water flowing out of the water turbine unit in the middle of winter is still 4, the river water carries a large heat energy, forming the Songhua River dozens of miles slowly flowing through the urban area without freezing wonderland. Water vapor evaporates from the surface of the water continuously, and the white mist rises on the entire river surface and does not dissipate for a long time.

Along the long embankment of the river, the pine trees stand up, the willows hang low, and the transpiring mist on the river surface condenses into a tree hanging under the action of certain air pressure, temperature, wind direction and other conditions.

The formation of beautiful tree hangings and frosts: When the temperature drops to 0 °C, the water vapor in the air condenses on the branches, blades of grass, buildings and other objects.

Frost formation conditions: the air should be relatively humid and the water vapor should be sufficient; The temperature should be lowered to 0°C and kept for a while.

Tree hanging, also called rime, the following are poems describing rime.

The willow tree bears honeysuckle, the pine and cypress bloom and the silver chrysanthemum suddenly comes like a night spring breeze, the pear blossom of thousands of trees and thousands of trees blooms in the cold river, the snow willow is sunny and sunny, and the jade tree Qionghua is full of spring. After all the days into this scene, everything in the world is hard, the cold river is dawning and fog, and the sky is icy, and the trees and trees are stacked with flowers. Flying thousands of wisps last night, who cut strips of clear snow?

The ice feathers are crystal clear, the neon clothes are slender, and they want to dance in the high cold. Smoke and waves, who do you want to date?

The incense is warm, and the moon is cold.

I heard that the harvest year began from now on, and I went back to the candle roll to look at it.

The cold river is foggy, the sky is icy, and the trees and trees are stacked with flowers.

Flying thousands of wisps last night, who cut strips of clear snow?

The ice feathers are crystal clear, the neon clothes are slender, and they want to dance in the high cold.

Smoke and waves, who do you want to date?

The rime is thick, the sky and the clouds and the mountains and the water, up and down are white.

The shadow on the lake, but a trace of the long causeway, a little pavilion in the center of the lake

With Yu Zhou, one mustard, two or three people in the boat.

Watching the fog rime and the mountains are hazy, and they are happy to condense as Qiong.

Yingying is in the jade realm, and Hao Hao steps in the heavenly palace.

The wind rises and the clouds and waves, and the sun is steaming and the wax rainbow is flying.

Looking back at the trees in the distance, the scenery is already verdant.