Overall characteristics
Generally speaking, in autumn, the solar altitude angle decreases and the temperature decreases; The autumn wind is cool, the summer heat is gone, the fruits are covered with branches, and the fields are golden.
1, phenology
Autumn is the harvest season, and many plants mature in autumn. In the subtropical region of the northern hemisphere, the temperature in autumn is obviously lower than that in summer. As the temperature drops, the leaves of many deciduous perennial plants will gradually change color, wither and fall off, leaving only branches for winter. Panicum miliaceum will come to the end of his life, wither and die.
2. Temperature
As can be seen from the date distribution map of beginning of autumn in China, Northeast China is the earliest place in beginning of autumn in eastern China. In autumn, the cold air in the north is constantly invading, but its power is not very strong. Autumn weather often forms in northern China, and continuous autumn rain often appears in West China. The temperature will gradually drop in autumn, but it is generally slower than in winter.
Due to the difference of dry and wet conditions, there will be cold and rainy weather conditions or dry and cool weather conditions in different regions. In the cold late autumn, due to the large temperature difference between day and night, the water vapor transpiration during the day will condense at night, either dew or frost.
3, the division standard
Divide four seasons according to climate and average temperature. The index is that the average temperature is below 10℃ in winter, above 22℃ in summer, and 10~22℃ in spring and autumn respectively. July to September in the lunar calendar, autumnal equinox to beginning of winter, September to 165438+ October in the solar calendar, and autumnal equinox to winter solstice in astronomy. In China, autumn begins in early autumn, passes through early autumn, Mid-Autumn Festival and late autumn, and finally ends in early winter.
The phenological standard studied by meteorologists is: after the intense summer heat, the average temperature for five days is stable below 22℃, which means that it enters autumn and ends when it is below 10℃.
4. Natural disasters
The main meteorological disasters in autumn are: autumn rain in West China, cold dew wind in the south, frost and chilling injury at low temperature.
Extended data
summary
The climate changes greatly in autumn. It is hot and humid in early autumn, dry before and after Mid-Autumn Festival, and cool in late autumn. Therefore, people should be vigilant and pay attention to health preservation in their daily lives. They can put on loose cotton socks before going to bed to avoid catching a cold, and often hang down their hands to prevent catching a cold.
general idea
1, sleep regulation
In autumn, the wind is strong and the lung qi converges. It is advisable to "go to bed early and get up early" when sleeping, and it is better to lie with your head facing west when sleeping. In late autumn, the climate is cold, so it is not appropriate to sleep with the door closed all day or with your head covered at night. It is necessary to develop the habit of often opening the window and sleeping at night, keep indoor air circulation and reduce respiratory diseases.
2. Autumn clothes
Autumn clothes especially advocate "autumn freezing" The so-called "autumn freezing" means "autumn is not busy adding clothes", which consciously "freezes" the body. In this way, body heat sweating, sweat evaporation, loss of yin and body fluid and Yin Qi leakage caused by wearing more clothes are avoided, which meets the health needs of storing yin essence and keeping Yin Qi in autumn.
In addition, mild cold stimulation can improve the excitability of the brain, increase the blood flow of the skin, accelerate the metabolism of the skin, enhance the cold tolerance of the body, and help avoid diseases such as colds.
Of course, "autumn freezing" also varies from person to person and from day to day. If the elderly and children, due to poor physiological function, weak resistance, into the late autumn should pay attention to keep warm; If the temperature drops suddenly and there is rain and snow, don't freeze in autumn again. You should add and subtract clothes in time according to the weather changes, so it is advisable to do some activities without sweating. The climate changes greatly in autumn, so the increase or decrease of clothes should be timely and timely.
Step 3 refrain from sexual intercourse
Chinese medicine believes that in autumn, we should pay attention to conform to the laws of natural collection, control sexual intercourse and nourish yin essence. This is especially important for middle-aged people. Because people over 40 years old, the yang will gradually weaken from exuberance, and it is a natural trend to lose energy in old age. If you can take good care of yourself, don't overdraw your physical strength, and pay attention to nourishing kidney and essence, you can delay aging and achieve longevity, so abstinence for middle-aged people is very necessary.
Baidu encyclopedia-autumn health
Baidu Encyclopedia-Autumn