Why is the weather so hot?

1. There are two main reasons why summer is hot. One is that the sun is located in our hemisphere, so the sun’s altitude angle is large and the solar radiation is strong. The other is that the daylight hours are long in summer. There is naturally more light. In summer, the sun is close to the Tropic of Cancer. We in China are in the northern hemisphere, so it will naturally be hot during the summer months. In contrast, countries in the southern hemisphere, such as Australia and New Zealand, have the opposite climate to that in the northern hemisphere. In the northern hemisphere summer, the direct sunlight point is located in the northern hemisphere. The solar altitude angle (the angle between the sun's rays and the ground plane) is large in various places in the northern hemisphere. The atmospheric path of the equivalent amount of solar radiation is relatively short. The solar radiation weakened by the atmosphere is relatively small. The solar radiation reaching the ground Just more. At the same time, due to the large altitude angle of the sun, the area where the same amount of solar radiation is spread is small, and the ground receives more solar radiation per unit area. The temperature is relatively high. Also, in the northern hemisphere summer, the days are long and the nights are short, so the heat income is more and the expenditure is less. In addition, during the summer in the Northern Hemisphere, thermal low pressure forms on land, and the high pressure center at sea transports warm and moist air masses to low latitudes, raising the temperature to a certain extent. The reason for the muggy heat is high air humidity. On the one hand, the temperature is high, evaporation is large, and the water vapor content in the air is high. On the other hand, the warm and humid air from the ocean provides more water vapor, and the water vapor content is high, making people feel stuffy. It's like taking a sauna. 2. Because of the greenhouse effect, the greenhouse effect is also called the "greenhouse effect" and is a common name for the atmospheric insulation effect. The atmosphere can make the short-wave radiation of the sun reach the ground, but the long-wave thermal radiation emitted by the surface is absorbed by the atmosphere, which increases the temperature of the surface and lower atmosphere. Because it acts like a greenhouse for cultivating crops, it is called the greenhouse effect. If this effect did not exist in the atmosphere, surface temperatures would drop by about 330C or more. On the contrary, if the greenhouse effect continues to strengthen, global temperatures will continue to rise year by year. Since the Industrial Revolution, the amount of heat-trapping greenhouse gases such as carbon dioxide emitted by humans into the atmosphere has increased year by year, and the greenhouse effect of the atmosphere has also increased. This has caused a series of serious problems such as global warming, which has caused concern in countries around the world. of attention. Greenhouses have two characteristics: the temperature is higher than outside and they do not dissipate heat. The glass flower rooms and vegetable greenhouses we can see in life are typical greenhouses. Using glass or transparent plastic film to make a greenhouse allows sunlight to directly shine into the greenhouse and heat the indoor air. The glass or transparent plastic film prevents the indoor hot air from radiating outward, keeping the indoor temperature higher than the outside world. state to provide conditions conducive to rapid plant growth.

The greenhouse effect caused by environmental pollution refers to the phenomenon of heating of the earth's surface