How rime and rime are formed, and how rime is formed

In nature, ice crystals and water droplets that form on ground objects are not all frost and dew. There are some phenomena that appear to be frost and dew, but they are caused by other meteorological conditions.

For example, if the temperature in an area is low, the temperature of various ground objects will also be lower. When the weather warms up rapidly (e.g. a 10°C temperature rise), some large and heavy objects cannot become as warm as the surrounding air all at once, so that a large temperature difference is formed between the air and these objects. If the temperature is below 0°C, ice crystals will form on the object, which is called"Rime"。

If the temperature is above 0°C, it will condense into water droplets on the surface of the object, which is called"Rime"。Winter on the glass windows"Window cream"with"Heh water"The formation is similar to this.

Rime and rime are formed by the temperature difference between the air and the ground object. However, the temperature difference between the formation of rime and the rime is caused by the warming of the weather, and the temperature difference between the formation of frost and dew is caused by the radiative cooling of ground objects. Therefore, the weather conditions they reflect are different, and the objects attached to them are not the same, they are different weather phenomena.

In early or late winter, there is sometimes a strange phenomenon in which liquid raindrops falling from the sky fall on tree branches, power lines or other objects, and suddenly freeze into a layer of ice with a smooth and crystal clear appearance"Yusong"。What's going on with this phenomenon of rain turning into ice?

In fact, the raindrops here are not ordinary raindrops, but supercooled raindrops. This is uncommon and occurs when warm and cold air clash and the warm air is strong. This is the air temperature near the ground layer is low (slightly below zero degrees Celsius), and there is a layer of air or clouds above the temperature above zero degrees Celsius, and above there is a cloud layer with a temperature below zero degrees Celsius, the snowflakes falling from here melt into raindrops when they pass through the warm layer, and then when it enters the cold layer near the ground, the raindrops will cool rapidly, because the diameter of these raindrops is very small, although the temperature drops below the cold degree Celsius, but it has not had time to freeze and falls, and when it touches the cold objects on the ground, it freezes immediately, which became what we call it"Yusong"。

In addition, it is especially beneficial for ice crystals to grow on ground objects when there is supercooling fog. At this time, white ice flowers are formed on power lines and branches, which are called"Rime"。When there is fog and the temperature is higher than 0°C, fog droplets stick to and collect on leaves or other objects"Fogging", which is most common in forests.

Neither of them is frost and dew, as the reasons for their formation are different.

The formation of rime is associated with a long period of cold climate in winter.

Formation of rime:

Rime is a white or milky opaque layer of ice that adheres to the windward side of ground objects (e.g., tree branches, power lines). It is also formed by the condensation of supercooled water droplets. Rime is formed when supercooled water droplets (temperatures below freezing) collide with objects that are also below the temperature of the frozen wheel.

When water vapor in the air collides with an object, it immediately condenses into a solid state, forming a rime layer or rime deposit.

Features of rime:

Misty pine is a white or milky opaque layer of ice attached to the windward side of ground objects (e.g., tree branches, power lines). Because there are many gaps between the droplets and the droplets in the rime, the rime is completely opaque white. The rime is light and white, attached to the tree object, like the honeysuckle of the Qiong tree, delicate and elegant, this is the tree hanging (also round called the snow hanging).

Historical Records:

China is the earliest country in the world to record rime, for thousands of years, the ancient Chinese people have long had many names and praises for rime.

As early as the Spring and Autumn Period (770 BC-476 BC), there is a record of "tree crops" in the "Spring and Autumn Period", and some are called "Shujie", which is now called "rime".

In the Song Dynasty, Zeng Gong's poem "Winter Nights Are Things" contains: "The incense is warm, and the moon is cold and the fog is cold." I heard that the harvest year began from now on, and I went back to the candle curtain to see.

Qi is very cold, the night air is like fog, condensed on the wood, Dan looks like snow, the sunrise floats all over the terrace, it is particularly lovely, Qi people call it rime. As the proverb goes: 'The rime is heavy with rime, and the poor man has rice.'

I thought it was a good omen. The Song people called it "rime", and "thought it was a sign of a good year". It is likely that the concept originated from the ancient name of the rime, "tree crop".