The residual snow is gradually disappearing, the wind is getting warmer, the temperature is gradually warming up in late winter and early spring, the flying snow is about to leave, the drizzle wants to return to the earth to moisten all things, and a heart is reluctant to leave; One hurried and eagerly moved forward.
When the season turns to winter, the rain quickly condenses into ice on high-rise buildings, trees, electric poles and other objects, we are used to calling it "dripping into ice", when the cold air goes south and encounters the warm and humid airflow, the cold air is inserted below the warm air, and the temperature near the ground drops sharply below freezing, and the warm and humid air is pushed up to form clouds and form rain.
When they fall in the wind and are about to solidify, the water droplets that have been cooled come into contact with the cold object, instantly forming a solid "freezing rain", this liquid to solid process is done in one go, the freezing rain falls to the ground, causing the ground to quickly accumulate a thick layer of ice.
The freezing rain is half into snow, and the visitors are cold and mossy "The confrontation between cold and warm air forms a freezing rain weather, which has caused a lot of trouble to people, in fact, it is not the moss that makes the hiking road extremely slippery, but the freezing rain that falls into ice.
There are two types of rime, the first is when the breeze and the cold temperature reaches -15, under the condition that the air humidity is higher than the saturation of the ice surface, the water vapor in the air will condense directly on the ground object, thus forming a needle-like rime, or the supercooled fog droplets will freeze directly on the surface of the object, forming milky white ice crystal deposits.
Its appearance appears as white plush needle-like crystals that shimmer with ice crystals, and are usually thinner and less dense.
In addition, under slightly cold, dense fog and windy weather conditions, the supercooled droplets will quickly freeze on the windward side and convex parts of the object, maintaining the shape of the droplets, and finally forming a granular milky white ice layer with uneven surface, which is denser and is called granular rime.
Zeng Gong, a writer in the Northern Song Dynasty, once wrote a poem "Rime": "The sunrise in the garden is quiet and windless, and the rime flowers bloom and the trees are the same." In the early morning, the poet walked in the quiet garden, the wind was light and the fog was light, and the trees were covered with white rime, and the sunlight shone through the mist and shone on the trees, adding some warm color to the white rime.
Another phenomenon that can make trees cover ice is snowflake condensation, which has a similar appearance to rime and can be easily confused if you don't look closely, because the structure of the rime is relatively fragile and can easily fall off when shaken.
Rime is formed by the condensation of supercooled raindrops or drizzle on the surface below 0, whereas rime is formed by the condensation of supercooled water droplets from the air on objects such as tree branches. Both are formed from water, with the water of the rime coming from raindrops falling in the air, and the water of the rime coming from the moisture in the air.
The conditions for the formation of rime are quite harsh, and if the temperature near the ground is high, the falling snowflakes will partially melt. At this time, the snowflakes will become sticky and will adhere to the surface of the branches after falling onto the tree.
During snowfall, if the temperature drops sharply in the event of a cold snap, the snow will no longer melt, and the snowflakes will be stuck and frozen by the water droplets on the branches, and the snowflakes will accumulate thicker and thicker, and as the snowflakes continue to fall, they will continue to adhere to each other to form a thick layer of rime.
Rime and rime can be distinguished by the way they are piled up in the direction of the wind, and when the wind is light, the rime will pile up on the branches in a vertical direction; When the wind is strong, the rime will accumulate in the direction of the wind, the granular rime will accumulate with the wind, and the needle-like rime will be evenly distributed on the branches, with no obvious direction of accumulation.
In icy and rainy weather, people should try to go out as much as possible, if they must go out, they need to take warm measures to prevent slipping, pedestrians should keep their distance to avoid vehicles, and drivers should slow down in icy and rainy weather.
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