What are the characteristics of the autumnal equinox solar terms of 20 19?

The autumnal equinox is one of the 24 solar terms. At the autumnal equinox, it has entered a crisp autumn season, and the weather in autumn is getting colder and colder. What are the characteristics of the autumnal equinox solar terms? What are the climatic characteristics of the autumnal equinox? Next, let's take a look at this issue of the old almanac!

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Characteristics of solar terms of autumnal equinox 20 19

1, on the day of the autumn equinox when the cold air moves south, the sun is located at 180 degrees, and the sunlight is almost direct to the equator, and the day and night are almost equal. At this time, the waiting temperature in the southern region has generally dropped below 22℃, and it has entered a cool autumn. "An autumn rain and a cold". The cold air from the south meets the warm and humid air that gradually decays, resulting in repeated rainfall and the temperature dropping again and again.

2. The ground loses a lot of heat and the temperature drops quickly. After the autumnal equinox, the position of direct sunlight moves to the southern hemisphere, and the northern hemisphere gets less and less solar radiation, but the ground heat loses more and the cooling speed is obviously accelerated. Agricultural proverbs say: "An autumn rain is a cold", "The white dew is divided into autumn nights, and one night is cold". "In August, the wild goose gate opens, and the foot of the wild goose is frosty." It is not surprising that the temperature in Northeast China drops early and frost appears at the autumnal equinox.

3. Entering the autumn equinox season when the average daily temperature in autumn is below 22℃, the Yangtze River basin and the vast areas in northern China have successively entered autumn, and the average daily temperature has dropped below 22℃. Air conditioning in the north began to have a certain impact. In most areas, the rainy season has just ended, with a cool breeze blowing gently, the sky is high and the clouds are light in Wan Liqing, the air is crisp in autumn, the sweet-scented osmanthus is fragrant, the crab is fat and the chrysanthemum is yellow, and the autumn equinox is a beautiful and pleasant season.

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What are the climatic characteristics of the autumnal equinox?

The first frost is not surprising. As the saying goes, "In August, the geese bloom, and first frost takes the first step." It is not surprising that frost is seen in the autumn equinox in the early years of cooling in parts of northwest and northeast China controlled by continental cold high pressure. The arrival of the first frost marks the end of the growing period of crops, and agricultural production begins to enter the busy period of autumn harvest. However, not all plants can't stand the cold. Chrysanthemums and maple leaves standing proudly in the autumn wind constitute a beautiful picture of "yellow flowers with golden eyes and red leaves with scales". At the same time, with the arrival of the first frost, people in these areas can enjoy the autumn scenery in advance.

Cold dew wind, which affects agricultural disaster weather, is a low-temperature chilling injury that causes obvious cooling after the invasion of cold air in autumn, affects heading, flowering and filling of late rice and reduces production. Due to the different time and intensity of strong cold air every year, cold dew winds mostly appear in the middle and lower reaches of the Yangtze River in South China, the autumn equinox in northern Guangxi, northern Guangdong, northwestern Fujian and central Fujian. The standards in different places are not exactly the same. Usually, the daily average temperature in the middle and lower reaches of the Yangtze River is lower than 20℃ for three consecutive days or more as the standard of cold dew wind; The average daily temperature in South China is below 22℃ for three consecutive days or more.

In September and June of 5438+00, due to the confrontation between cold and warm air, the disastrous weather in West China (Weishui and Hanshui river basins, Sichuan, most of Guizhou, eastern Yunnan, western Hunan and western Hubei) often occurred continuously, and some even lasted for more than ten days or dozens of days. Especially in Sichuan basin, it happens almost every year, and it often rains at night. Li Shangyin, a famous poet in Tang Dynasty, wrote a poem "Roses Raining at Night in Autumn Pond", which is a vivid description of this situation. It is rainy in autumn, and the wet damage is serious, which has a great influence on autumn harvest, autumn ploughing and autumn planting. It is necessary to grasp the sun, control soil moisture and prevent waterlogging, and do a good job in the quality and progress of Sanqiu production. At the same time, we can make full use of the meteorological conditions of less rain and good soil moisture in autumn, do a good job of afforestation without losing time, and strive to improve the survival rate of saplings.

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After the autumnal equinox, the number of rainy days and rainfall in most parts of China, including Jiangnan and South China (except the rainstorm caused by tropical cyclones) entered a period of decreasing precipitation, and the water levels of rivers and lakes began to decline, and some seasonal rivers and lakes even dried up gradually. During this period, there may be individual tropical cyclones, but the impact location is south, mostly affecting the coastal areas of South China and Hainan Island. At this time, in addition to the gale disaster, the rainfall brought by typhoon is often beneficial to local soil moisture conservation, because these areas will turn into dry season after 10.

After the spring equinox in Jiangnan, the warm air (subtropical high) that once occupied the mainland continued to withdraw southward. Cold air will soon become the dominant force in most parts of China. As the saying goes: "A thousand years is divided into autumn nights, and one night is cold." With the southward movement of cold air, most of the south of the Yangtze River has entered autumn in general (the average daily temperature for five consecutive days is ≤22℃). The "autumn tiger" disappeared and people began to enjoy the good weather in a year. In Jiangsu and Zhejiang, people use all beautiful words to describe it, such as golden wind, light cloud, sweet-scented osmanthus, crab fat and chrysanthemum yellow.

Under normal circumstances, Xinjiang, Qinghai, Sichuan, Tibet, Inner Mongolia and Heilongjiang have entered the early winter at the autumnal equinox. Snowflakes sometimes appear in Mohe and Huma in the northernmost part of China, Hailar in the northern part of Inner Mongolia, Ganzi and Songpan in the western part of Sichuan. Some areas in Heilongjiang, Jilin and Liaoning have entered the late autumn season. People climb high and look far, and come to the dense forests in mountainous areas to enjoy the layers of autumn colors. From southern Liaoning to the south of the Yangtze River, people enjoy the coolness brought by autumn. In Guangdong, Guangxi, Hainan and other places in South China, the average daily temperature is still above 22℃, people are still blowing air conditioners and eating watermelons, and they still haven't walked out of the long summer, but there are not many humid and sultry weather in summer, and there will be several thunderstorms when strong cold air moves south.

The influence of fog can not be ignored. Entering the autumnal equinox, foggy weather began to increase, mainly radiation fog. Radiation fog is a fog formed by the condensation of water vapor in the air layer near the ground due to the radiation cooling effect of the ground. It often appears at night or in the early morning, partly cloudy, sunny and breezy. In autumn and winter, this kind of fog often appears in the inland areas of China. Radiation fog often covers a large area and spans several provinces, which not only easily causes urban traffic congestion, but also affects the normal operation and safety of expressways, inter-provincial national highways, aviation and railways.

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