Harm of global temperature rise
The frequency of extreme weather such as 1, drought and flood has increased, which has brought great damage to the global agricultural development.
2. Global temperature rise will provide great kinetic energy to the air and ocean, thus forming large or super-large natural disasters such as typhoons, hurricanes and tsunamis.
3. Glacier melting leads to global sea level rise, threatening coastal and low-altitude countries.
4. Animals become extinct quickly because they can't adapt to the new environment, resulting in a vicious circle.
5. It will greatly reduce the agricultural output of grain, feed and so on in inland areas, and make mankind face the crisis of grain and meat.
Causes of global temperature rise
First, human factors.
A large number of artificial structures in the city, such as paving the ground and various building walls, have changed the thermal properties of the underlying surface. Urban surface water content is less, and more heat enters the air in the form of sensible heat, which leads to an increase in temperature.
In addition, motor vehicles, industrial production and a large number of human activities in cities produce a lot of nitrogen oxides, carbon dioxide, dust and so on. These substances can absorb a lot of energy from the thermal radiation in the environment, which leads to the further increase of atmospheric temperature.
Second, the latitude factor
The basic source of atmospheric heat is solar radiation. The solar radiation energy obtained in low latitudes is more and the temperature is higher. At high latitudes, the solar radiation energy is less and the temperature is lower. Therefore, in the northern and southern hemispheres, whether it is 1 or July, the temperature decreases from the low latitude to the poles. Using this law, the hemisphere can be determined according to the temperature change in the north-south direction.
Third, the influence of terrain height.
Same latitude, high terrain and low temperature. For example, in summer, the Qinghai-Tibet Plateau is the lowest temperature in China, and the middle and lower reaches of the Yangtze River, which is equivalent to its latitude, is one of the hottest centers in China. The reason is that the temperature decreases with the elevation, and the temperature decreases by 0.6℃ for every increase of 100m.
Fourth, the influence of land and sea differences.
The isotherms on land are mostly curves, while those on the ocean are relatively gentle. The land temperature is higher than the sea surface temperature in summer and lower than the sea surface temperature in winter. The reason is that the land is heated and released quickly, so the land temperature is higher than that of the ocean in summer and lower than that of the ocean in winter. The temperature difference between winter and summer on land is larger than that in the ocean, and the interannual variation of ocean temperature is small.
Verb (abbreviation for verb) the influence of ocean current
The temperature in the area where the warm current flows at the same latitude is high, and the isotherm is convex to the high latitude; The temperature in the area where the cold current flows is low, and the isotherm rises to the low latitude.