Winter is getting deeper and deeper, and many cities begin to snow or freeze. Rime is a phenomenon of ice, but it is different from ice. So what is rime? How did the rime in the book come into being? In this article, let's learn about the formation of rime and the best viewing time and place.
What is rime
Rime, commonly known as tree hanging, is a milky white ice crystal deposit in which the water vapor in the low-temperature space-time gas condenses directly, or the supercooled fog droplets freeze directly on the object. It is a very rare natural spectacle.
The word "rime" first appeared in the Song Dynasty & middot; In Zilin compiled by LV Chen (420-479 A.D.), it is explained as: "the cold air freezes like a pearl, but the sunlight disappears. Qilu is called rime." This is the word 'rime' first seen in the literature.
Rime is not ice or snow, but the result of the continuous accumulation of frozen and sticky water vapor below zero degrees Celsius in the fog on branches and other objects with the wind, which is shown as white opaque granular structure sediments. The formation of rime requires low temperature and sufficient water vapor. At the same time, it is rare to have these two extremely important and contradictory natural conditions for the formation of rime.
Rime is a white or milky opaque ice layer attached to the windward surface of ground objects (such as branches and wires). Because there are many gaps between fog drops in the rime, the rime is completely opaque white. Rime is light and white, attached to tree objects, like Qiong tree and silver flower, beautiful and elegant. This is tree hanging (also known as snow hanging).
There are two main shapes of rime. One is that supercooled fog drops quickly freeze into granular small ice after touching cold ground objects, which is called granular rime (or hard RIME), and its structure is relatively compact. The other is the crystalline rime (or soft rime) formed by the condensation of water vapor generated during the evaporation of fog droplets. The structure is loose and will fall off if there is a slight vibration.
How did the rime on the branches form?
First of all, the harsh conditions for the formation of rime require not only cold and long winter, but also sufficient water vapor in the air. Secondly, the formation of rime requires both sunny and cloudy days, calm wind, or very small wind speed. The clouds in the air are like a quilt of the earth. When there are clouds at night, the outward long wave radiation is weakened, so that the ground temperature decreases slowly. The temperature difference between day and night is relatively small, and the water vapor in the air near the ground will not condense. If the quilt is removed, more heat will be emitted, reducing the ground temperature and providing necessary conditions for the condensation of water vapor.
Strong wind is the natural enemy in the formation process of rime. It can always blow away the ice crystals with loose structure in the formation process. Even the rime clustered together will be blown away. The breeze or calm wind conditions provide guarantee for the condensation of water vapor into rime. In general, in winter, the probability of sunny days and calm or breezy weather is not very high. In addition, when there is supercooling fog, it is especially conducive to the growth of ice crystals on ground objects. At this time, white ice flowers, called rime, were formed on the wires and branches. When there is fog and the temperature is higher than 0-DEG; C, fog droplets adhere to and gather on leaves or other objects, which is called fog condensation, which is the most common in forests.
Viewing place and time:
Jilin rime occurs in the downstream coastal area of Fengman dam of Songhua Lake in Jilin City. It is the snow willow phenomenon formed by the interaction between the cold climate conditions in Northeast China and the warmer river water, which is directly condensed into frost crystals from wet water mist and attached to the trees on the Bank of the embankment.
Jilin rime is one of the four natural wonders in China. Rime island is a famous rime scenic spot in China. It is located one kilometer south of Hantun village, Wulajie Town, 35 kilometers north of Jilin City. It is a naturally formed river center island on the Songhua River. It is famous at home and abroad for its thick and lasting rime and wonderful tree shape in winter.
The formation cycle of rime in kurbin River Basin of Yichun, Heilongjiang Province is long, up to 4 months, and the residence time of rime is up to 10 hours a day. There are 15 kilometers of rime forest along the downstream coast of kurbin hydropower station, covering an area of 300 square kilometers. The hydropower station of kurbin reservoir releases water above zero degrees Celsius every day. The river is not frozen all year round, forming a thick fog. When it merges with the cold air, it forms a spectacular rime wonder like a fairy tale world. The snow is boundless and covered with snow.
In addition, there are Huangshan, Lushan and other famous mountains.
Time: the best time to see the fog song in a day is in the morning. Because the fog song is formed in the morning, you should get up early to see the fog song before the sun comes out. When you get up around 5:00 in the morning, you can see the frost and snow on the pine willows. With the slow rise of the sun, you can also take pictures of the red morning glow sprinkled on the white fog pine. The time to disappear depends on the wind of the day, If the wind is strong that day, it is estimated that it will start to fall at 9 o'clock. When there is no wind, it can be maintained until 11 or 12 o'clock.