autumnal equinox is one of the 24 solar terms. At the autumnal equinox, it has entered the autumn season, and the weather gradually turns cool in autumn. What are the characteristics of autumnal equinox solar terms? What are the climatic characteristics of the autumnal equinox? Next, let's follow the old yellow calendar of this issue and have a look!,
and you may be interested in: the characteristics of the autumnal equinox solar terms ofand
on the auspicious day of 2020. 2019and
1. The cold air goes south. On the autumnal equinox, the sun is located at 180 degrees of the Yellow meridian, the sun is almost direct at the equator, and the day and night are almost the same length. At this time, the temperature in the South generally dropped below 22 ℃ and entered a cool autumn. "An autumn rain, a cold". The cold air going south meets the gradually decaying warm and humid air, resulting in rainfall and temperature drop again and again.
2. There is a lot of heat loss on the ground and the temperature decreases rapidly. After the autumnal equinox, the position of direct sunlight moves to the southern hemisphere. The northern hemisphere gets less and less solar radiation, but there is more heat loss on the ground, and the speed of temperature reduction is significantly accelerated. Agricultural proverbs say: "an autumn rain, a cold", "White Dew autumn night, night cold night". "The wild goose gate opens in August, and the wild geese bring frost at their feet". It is not surprising that the temperature in Northeast China drops as early as the year equinox, and the frost is seen at the autumn equinox.
3. In autumn, the daily average temperature is below 22 ℃, and in the autumnal equinox, the Yangtze River Basin and its vast areas to the north have entered autumn successively, and the daily average temperature has dropped below 22 ℃. The cold air in the North began to have a certain power. In most areas, the rainy season has just ended. The cool wind is blowing, the blue sky is thousands of miles, the wind is sunny, the autumn is crisp, the osmanthus fragrance, the crab is fat, the chrysanthemum is yellow, and the autumn equinox is a beautiful and pleasant season.
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on the auspicious day of travel in 2020? It is not surprising that the
has the first frost. The proverb says: "the Yanmen gate opens in August, and there is frost at the foot of the wild geese". In some areas in the northwest and northeast controlled by the cold and high pressure of the mainland, it is not surprising that frost can be seen at the autumnal equinox in years with early cooling. The arrival of the first frost marks the end of the crop growing season, and agricultural production began to enter the busy period of autumn harvest. However, not all plants are so resistant to the wind and cold. The chrysanthemums and maple leaves standing proudly in the autumn wind form a beautiful picture of "yellow flower, golden animal eye and red leaf fire dragon scale". At the same time, the arrival of the first frost makes people in these areas enjoy the autumn scenery of "frost leaves are red than February flowers" in advance.and
are the disastrous weather affecting agriculture. The Cold Dew wind is the low-temperature cold damage that causes significant cooling after the invasion of cold air in autumn, affects the heading, flowering and filling of late rice, and reduces yield. Due to the different occurrence time and intensity of strong cold air in each year, cold dew wind mostly occurs at the autumn equinox in the middle and lower reaches of the Yangtze River, Northern Guangxi, northern Guangdong, northwest Fujian and central Fujian in South China. The standards are not exactly the same everywhere. Generally, in the middle and lower reaches of the Yangtze River, the standard of Cold Dew wind is that the daily average temperature is lower than 20 ℃ for three consecutive days or more; The standard in South China is that the daily average temperature is lower than 22 ℃ for three consecutive days or more.
disastrous weather affecting agriculture autumn rain in Western China in September and October, due to the confrontation between cold and warm air, continuous autumn rain often occurs in Western China (Weishui and Hanshui River basins, Sichuan, most of Guizhou, Eastern Yunnan, Western Hunan and Western Hubei), some even for more than ten or dozens of days. Especially in Sichuan Basin, it occurs almost every year, and it often rains at night. The famous Tang Dynasty poet Li Shangyin's poem "the rain rises in the autumn pond at night in Bashan" is a vivid description of this situation. There is a lot of continuous rain in autumn, with serious wet damage, which has a great impact on autumn harvest, autumn tillage and autumn planting. We should seize the sunshine, manage moisture and prevent stains, and pay close attention to the quality and progress of "three autumn" production. At the same time, we can make full use of the meteorological conditions of cloudy and rainy autumn and good soil moisture, lose no time to engage in afforestation and strive to improve the survival rate of seedlings.,
and you may be interested: on the auspicious day of 2020,and
enter the period of precipitation reduction. After the autumn equinox, the number of rainfall days and rainfall in most parts of China, including Jiangnan and South China (except the rainstorm brought by tropical cyclone), enter the period of precipitation reduction, and the water level of rivers and lakes begins to decline, Some seasonal rivers and lakes even gradually dry up. 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 strong wind disaster, the rain brought by the typhoon is often beneficial to the local soil moisture conservation, because these areas will turn into the dry season after October.and
after the autumn equinox in the spring, the warm air (subtropical high) that originally occupied the mainland continued to retreat southward. Cold air will soon become the leading force in most parts of China. As the saying goes: "White Dew autumn night, night cold night.". With the cold air moving southward, most parts of Jiangnan have entered autumn in general years (5 consecutive days, daily average temperature ≤ 22 ℃). "Autumn tiger" disappeared, and people began to enjoy the good weather of the year. In Jiangsu and Zhejiang, it is not too much to describe all beautiful words, such as golden wind, light clouds, fragrant osmanthus, crab fat chrysanthemum yellow and so on.and
are two days from north to south. Usually, during the autumnal equinox, a few places in Xinjiang, Qinghai, Sichuan, Tibet, Inner Mongolia and Heilongjiang have entered the early winter. Snowflakes sometimes appear in Mohe and huma at the northernmost end of China, Hailar at the northern end of Inner Mongolia, Ganzi and Songpan in Western Sichuan. Some areas of Heilongjiang, Jilin and Liaoning have entered the late autumn season. People have climbed high and looked far into the dense forests in the mountains to enjoy the autumn colors dyed by the layers of forests. From southern Liaoning to Jiangnan, people enjoy the coolness brought by golden autumn. In Guangdong, Guangxi and Hainan in South China, the daily average temperature is still above 22 ℃. People are still blowing air conditioning and eating watermelon. They still haven't gone out of the long summer, but there are not many humid and muggy weather in summer. In case of strong cold air going south, there will be a few thunderstorms. The influence ofand
heavy fog can not be underestimated. Entering the autumnal equinox, the heavy fog weather began to increase, mainly radiation fog. Radiation fog is caused by the cooling effect of ground radiation, which makes it close to the ground air layer https://www.dailyq-a.com/Culture/28793.html
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