Why did the high temperature come so early this year?

Just after the long summer, the hot weather came. Recently, people have just experienced a high temperature. The temperature in most parts of the country has exceeded 30 degrees Celsius, and even the temperature in some areas has exceeded 36 degrees Celsius.

Compared with the past, this summer seems to come a little early. What's the matter?

temperature

Before talking about temperature, let's understand a word: subtropical high.

Because the rotation axis of the earth has an inclined angle, the direct sunlight position of the earth is different in different seasons, and the different direct sunlight position will profoundly affect the local temperature.

When the temperature in the equatorial region becomes hot, the equatorial region will move upward at this time, forming a low pressure at high altitude.

The air in the polar regions is cold, and the airflow will move downward to form high pressure. So the equatorial airflow will flow from the equator to the polar regions.

However, due to the influence of the earth's rotation deviation (the vertical airflow in the northern hemisphere is to the right, while the vertical airflow in the southern hemisphere is in the opposite direction), when the airflow at the equatorial altitude flows to the North Pole, it will gradually change from southerly wind to southwest wind until westerly wind, and the airflow direction will be parallel to the latitude near 30 degrees north latitude, which will prevent the airflow from moving further north, leading to the gathering and sinking of warm air from the equator, thus forming a subtropical high.

Generally, in areas controlled by subtropical high, there will be high temperature and little rain, and some areas will be cloudy and sunny. This is because the warm wind from the equator gathers and sinks in the subtropical high, so the temperature is higher.

In addition, the area controlled by subtropical high is sunny and partly cloudy, because the air sinks, so the water cannot rise to form clouds after evaporation.

Because there is more water vapor in the air, the water content in the air is higher, which makes people feel muggy and humid.

The recent high temperature weather is precisely because of the subtropical high.

Why did the high temperature come so early this year?

The formation of high temperature is related to many factors, the most important of which are the direct angle of the sun, the composition of the earth's atmosphere, the area of glaciers and human factors. In recent years, human factors have increasingly affected the earth's environment.

First, let's look at the influence of natural factors. As we know, the temperature of the earth is not constant. Even on the same day last year, there will be obvious changes in temperature and rainfall.

This is mainly because the earth's environment is changing. We know that plants can absorb carbon dioxide in the air and convert it into oxygen. The efficiency of carbon dioxide absorption by different plants is different. Forests, grasslands and other areas are constantly changing, which makes the earth's environment in a dynamic balance.

In addition, glaciers can regulate the temperature of the earth. When the glacier area increases, the glacier will store greenhouse gases such as nitrogen and carbon dioxide in the glacier in solid form, such as combustible ice. This will lead to the reduction of greenhouse gases in the air and lower the temperature of the earth.

If the glacier area is shrinking, it will release a lot of greenhouse gases and make the earth's temperature rise continuously.

In addition to natural factors, human factors are considered to be the main reason for the rise of the earth's temperature. Sun Ying, a researcher at the National Climate Center, studied the extreme climate in the summer of 20 13 in China. The research shows that the average high temperature in summer from 20 1955 to 1984 is higher than the average 1. 1℃, of which 0.8℃ is due to human activities.

With the continuous growth of China's scientific and technological level, human demand for fuel has also increased greatly. At present, the main energy we use is still fossil energy represented by oil.

Fossil energy will release a lot of greenhouse gases during the combustion process, which will raise the temperature of the earth. Conversely, rising temperatures will lead to shrinking glacier area.

We know that glaciers can reflect solar photons into the universe, and the reflectivity can reach more than 50%. However, shrinking glaciers can not only reflect solar photons into the universe, but also cause greenhouse gases carried by glaciers to be released into the atmosphere, leading to further temperature rise.

In other words, the earth temperature is a system, and the change of any one factor may lead to the rise of the whole earth temperature.

Because of this, there are so many extreme weather on the earth, which even caused fires in Australia and locust plagues in Africa.

abstract

Since the summer, due to the control of subtropical high, the earth's temperature has risen. Although the subtropical high sounds very academic, it can be summarized as follows: warm air from the equatorial high wants to run in the polar low-pressure area, but due to the influence of the earth's rotation bias, the air at about 30 degrees north and south latitude is parallel to the latitude, which makes the high-temperature warm air sink and forms high-temperature sunny and hot weather.

Because it is sinking air, it is difficult for water molecules to rise to form clouds and rain, so that the water content in the air is high, which makes people feel? Hot and humid? .

There are many factors that cause extreme high temperature. In addition to natural factors, human factors have gradually affected global temperature changes in recent years, making extreme weather frequent.