Natural characteristics of summer solstice

Climatic characteristics of summer solstice

(1) Convective weather

After the summer, the ground is heated strongly and the air convection is strong, and thunderstorms often form in the afternoon to evening. This hot thunderstorm came suddenly and went quickly, and the rainfall range was small. People call it "dividing fields in summer and rain". Liu Yuxi, a poet in the Tang Dynasty, skillfully borrowed this kind of weather and wrote a famous sentence, "Sunrise in the east, sunset in the west, drizzling, but the road is clear." The heavy precipitation brought by convective weather is not as beautiful as described in the poem, and it often brings local disasters. In his poem "Summer Rain", the poet Xu Shuxin also appropriately described the thunderstorm weather in summer: "In summer, when the wind blows, people sit on the stage, frogs and cicadas make noise and attack the dust. Golden gongs are ringing in the air, and cold rain is like money. "

(2) Rainstorm weather

In most cases, during the "summer solstice", it is the rainy season in the middle and lower reaches of the Yangtze River and the Jianghuai basin. Frequent rainstorms can easily lead to floods and even threaten people's lives and property. Therefore, we should pay attention to strengthening flood control.

(3) Meiyu in Jianghuai

Summer is the "Meiyu" season in Jianghuai area, and it is the yellow ripening period of plums in Jiangnan area. The air is very humid, and the cold and warm air masses meet here to form a trough of low pressure, which leads to continuous rainy weather. In this weather, the utensils are moldy, which makes people uncomfortable. Some mosquitoes breed quickly, and some intestinal bacteria are easy to breed. At this time, we should pay attention to drinking water hygiene and try not to eat cold food to prevent the occurrence and spread of infectious diseases.

(4) High temperature sauna

Like the winter solstice, the summer solstice is also a solar term reflecting the changes of the four seasons. Astronomy stipulates that the summer solstice is the beginning of summer in the northern hemisphere. After the summer solstice, although the direct sunlight point gradually moved southward, the days in the northern hemisphere became shorter and the nights became longer. However, because the heat radiated from the sun to the ground is still more than the heat radiated from the ground to the air, the temperature will continue to rise in the future, so there is a saying that it is not too hot from summer to the sun. According to the data of 195 1 to 2006, the historical extremes of many cities in northern China appeared after the summer solstice.