Interpretation of crisp autumn air

The definition of crisp autumn is to describe the cool weather in autumn, which makes people feel happy. The word "autumn crisp" comes from Du Fu's "Cui Shi Dongshan Caotang" in the Tang Dynasty, where autumn crisp is fresh.

Autumn introduction:

Autumn is one of the four seasons. Traditionally, China takes "beginning of autumn" in the 24 solar terms as the starting point of autumn. Entering autumn means that rainfall and humidity tend to decrease or decrease, and everything in nature begins to mature from lush. At present, the four seasons are usually divided according to the average temperature of modern scholar Zhang Baokun.

Its index is that the average temperature is lower than 10℃ in winter, higher than 22℃ in summer and higher than 10~22℃ in spring or autumn. Autumn is a season of alternating hot and cold.

Early autumn is still in the heat, but it hasn't come out yet. This is the hottest, wettest and sultry period of the year. After late autumn, it is sunny during the day, cool and dry at night, with large temperature difference between morning and evening, less rain and insufficient water. Therefore, autumn dryness has become the main feature of late autumn.

Overall characteristics:

Traditionally, China takes "beginning of autumn" in 24 solar terms as the starting point of autumn. The word "autumn" consists of the word "grain" and the word "fire", indicating the maturity of the five grains. After entering autumn, in nature, everything begins to mature from lush. Its climate began to change from rainy and humid in summer to dry and rainy in autumn.

The four seasons in China are often divided according to the change of temperature, using the "average temperature" of modern scholar Zhang Baokun. According to the weather average temperature method, there are two main criteria to judge autumn. First, the average daily temperature for five consecutive days 10℃-22℃ can be regarded as autumn, which is abbreviated.

The moving average temperature of five consecutive groups is lower than 22℃. A set of moving average temperatures refers to the average temperature of the day plus the average temperature of the previous four days divided by 5 to get the moving average temperature of five days, which is the sliding scale. Autumn divided by temperature means cool weather.

Phenology:

It is autumn in beginning of autumn so far, which means that precipitation and humidity are at the turning point of the year, and there is a tendency to decrease or decrease. In nature, everything begins to grow from lush to rich and mature. Autumn is the harvest season, and many plants mature in autumn.

In autumn, in nature, the qi of yin and yang begins to change, the yang is gradually declining, the yin is gradually flourishing, the climate turns from hot to cold, and everything is born with cold and gradually falls. This is the season of alternating hot and cold.