Why are dog days the hottest?
The Dog Days are the hottest period of the year, usually occurring from mid-July to mid-August. During this period, not only the temperature is high, but the humidity is also high, making people feel unbearably hot. So why are the Dog Days so hot? This article will analyze the causes of the Dog Days from a scientific perspective, and combine it with hot topics on the Internet in the past 10 days to reveal the secrets behind this phenomenon.
1. The definition and time of Dog Days
The dog days of dog days are divided into the first, middle and last days, and the specific times vary slightly every year. Here is the schedule for Dog Days of Summer 2023:
| stage | time | days |
|---|---|---|
| First fall | July 11-July 20 | 10 days |
| Zhongfu | July 21-August 9 | 20 days |
| Mofu | August 10th - August 19th | 10 days |
2. The reason why dog days are the hottest
1.The sun's direct point moves northward: During the Dog Days, the direct sun point is located in the northern hemisphere. The northern hemisphere receives the most solar radiation energy, and the surface temperature continues to rise.
2.Subtropical high pressure control: During the dog days of summer, the subtropical high-pressure system stably controls most areas of my country, resulting in clear weather and few clouds, making it difficult for surface heat to dissipate.
3.High humidity: There is more rain in summer, the water vapor content in the air is high, the humidity is high, the evaporation of human sweat slows down, and the body temperature is higher.
4.Surface heat accumulation: After accumulation in spring and early summer, a large amount of heat is stored on the surface, and this heat is released intensively during the dog days.
3. The hot topics on the Internet in the past 10 days are related to Dog Days
The following are the recent hot topics and data related to Dog Days across the Internet:
| hot topics | search volume | relevance |
|---|---|---|
| High temperature warning | 1,200,000 | directly related |
| Heatstroke prevention and cooling | 980,000 | directly related |
| Air conditioner purchase | 750,000 | indirect correlation |
| summer diet | 680,000 | indirect correlation |
| Sun protection measures | 550,000 | directly related |
4. Scientific ways to deal with the dog days of summer
1.Reasonably arrange outdoor activities: Try to avoid outdoor activities during the high temperature period of 10:00-16:00.
2.Scientific hydration: It is recommended to drink small amounts of water frequently, and the amount of water consumed per day should not be less than 2000ml.
3.diet regulation: Eat more light and easy-to-digest foods, and appropriately supplement foods rich in potassium and sodium.
4.Heatstroke prevention and cooling: The temperature should not be too low when using the air conditioner. It is recommended to keep it at 26-28℃.
5. Health risks of the dog days of summer
| health risks | Symptoms | Precautions |
|---|---|---|
| heatstroke | Dizziness, nausea, elevated body temperature | Avoid high temperature environment and replenish water in time |
| heat stroke | Confusion, convulsions | Seek medical attention immediately and perform physical cooling |
| cardiovascular and cerebrovascular diseases | Chest tightness, shortness of breath | Take medication regularly and avoid strenuous exercise |
| skin problems | sunburn, prickly heat | Use sun protection and keep your skin clean |
6. The history and culture of Dog Days
Dog Days has a history of more than 2,000 years in our country. Ancient people summarized the concept of "three volts" by observing the movement patterns of the sun. In traditional culture, the dog days are not only a climate phenomenon, but also closely related to health care, diet and other customs. For example, the north has the food tradition of "Tou Fu Dumplings and Second Fu Noodles", while the South has the "San Fu Tie" health care method.
7. Impact of climate change on Dog Days
In recent years, with global climate warming, high temperature weather in the dog days has shown the following trends:
| Year | Average number of hot days | extreme heat record |
|---|---|---|
| 2010 | 35 days | 39.5℃ |
| 2015 | 38 days | 40.2℃ |
| 2020 | 42 days | 41.7℃ |
| 2023 | 45 days (forecast) | 42.1℃(forecast) |
From the above analysis, it can be seen that the heat in the dog days is the result of the combined action of a variety of natural factors. Understanding these scientific principles can help us better cope with hot weather and stay healthy. At the same time, paying attention to the impact of climate change on Dog Days can also increase our emphasis on environmental protection.
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