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The proverb of frost contains ancient meteorological wisdom

DailyBird Culture 2021-10-09 1 0

in the long practice of production and life, the ancients in China gradually observed and summarized many laws of change of natural phenomena such as seasons, seasons and weather. In the past, when the level of science and technology was relatively backward, it was really great. Then today's old yellow calendar will sort out the meteorological wisdom contained in frost proverbs for you.

霜降的谚语

"the frost sees the sunny day again" and "the frost hits the red sun" are two proverbs that frankly explain that when there is frost, it is generally sunny weather, and the actual situation is indeed the same. The frost mentioned above mostly refers to radiation frost. Generally, this kind of frost is controlled by the cold high pressure from the north. The local area is in the high-pressure area and there is more downdraft. Therefore, the sky is clear and clear at night, and the weather is still fine the next day. The proverb

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and "when snow falls on high mountains, frost hits depressions" reflects two little meteorological knowledge: "high mountains are easy to snow" and "depressions are easy to frost".

why "snow falls on high mountains" -- it is easy to snow on high mountains? We know that the air temperature is generally the higher the height, the lower the temperature; On the contrary, the lower the altitude, the higher the temperature. For this reason, when the ground temperature at the foot of the mountain is still above 0 ℃, the temperature on the mountain is already below 0 ℃. The height of

and

cloud bottom from the ground varies from hundreds of meters to thousands of meters, so the temperature of cloud bottom is much lower than that of the ground; The temperature in the cloud is lower, and a large amount of water vapor in the cloud condenses into snowflakes and begins to fall. If the air temperature near the ground is high at this time, the snowflakes will gradually melt during the landing, and they will become raindrops instead of snow when they reach the ground.

if the snow hasn't melted before falling on the high mountain, it must be snowing on the high mountain. In other words, if it has snowed at the foot of the mountain, it must snow on the mountain. Even if there is no snow on the ground below the mountain, it may snow on the mountain. In summer, if the mountains are high, it may snow. This is the reason why snow falls on high mountains.

why "frost hits depressions" -- are depressions prone to frost? We know that frost does not fall from the sky, but is formed by the condensation of water vapor in the air near the ground directly on the ground or objects near the ground. Therefore, there is little relationship between the formation conditions of frost and the vertical distribution of air temperature.

we also know that the lower the air temperature, the greater the air density and the greater the specific gravity. Air is a fluid, so the coldest and heaviest air will flow to the lowest place. Once it reaches the lowest place, it will stay there and accumulate in the depression and gradually condense into frost. Therefore, the depression is easier to form frost than ordinary places, which means "frost hits the depression". The proverb

"once there is frost and sunny soon, three days have frost and sunny for a long time" reflects such a small meteorological knowledge: if there is frost in one morning, it will not be sunny for a long time. If there is frost in three mornings, the sunny time will be maintained for a long time. Why? As mentioned in

and

, frost is a common weather phenomenon in spring and autumn under the control of cold and high pressure. In the process of forming frost, no matter which kind of frost is formed by air cooling and water vapor condensing on the surface of cold objects. Therefore, the strength of frost is closely related to the strength of cold air force.

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and "once there is frost and sunny soon", which shows that the cold air force is not very strong, the temperature is not very low, and it is easy to remove, so it can only form one-day frost. After the cold air (weak high pressure) is removed, the local air pressure will be controlled by low pressure, and the weather will get worse.

and

on the contrary, if there is frost for several consecutive nights, it indicates that the cold high pressure has strong power, large range, slow movement and relatively stable. It can generally last for a few days or even a week. "Frost in three dynasties and sunny days for a long time" means that.

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