Why can't the snow snowball these days?

1 global carbon emission ratio is still in the process of accelerating global warming.

2 Global population growth

3 the development of the global economy

4 countries' urbanization process.

Although it is not specialized in snowfall. However, it can be said that there are two simple reasons. One is the warm winter effect caused by global warming and rising average temperature. Snowfall requires a relatively low atmospheric boundary layer temperature, otherwise even if there are snow clouds at high altitude, snowflakes will melt during the falling process. The second is air pollution. Although a certain concentration of suspended particles is beneficial to the formation of condensation nuclei, once the concentration of particles/condensation nuclei is too high, it will lead to the competitive effect of water vapor in the cloud. Because under the condition of constant total water vapor, the more condensed nuclei there are, the less water vapor will reach each nucleus on average. However, only when the water vapor is enough to make the condensation nuclei grow into ice crystals or water droplets large enough, their own weight will exceed the updraft in the clouds, and then rain or snowfall will occur. Therefore, when the concentration of particulate pollution is too high, it will indeed reduce the probability of precipitation. Simply put, it will lead to an increase in the number of water droplets in the cloud and a decrease in the particle size of each water droplet, which will lead to an increase in the life cycle of the cloud and an increase in the brightness of the sunlight emitted. These clouds often don't form rain or snow, but they will evaporate under long-term sunlight.

In addition, the impact of El Nino phenomenon, coupled with the destruction of the earth's environment by human beings, has intensified the greenhouse effect, making it hotter and hotter in summer and colder and colder in winter. The weather has changed. In some places, the snowfall decreases in winter, and in some places, the snowfall increases.

El Nino phenomenon, also known as El Nino current, is a climatic phenomenon caused by the imbalance between the ocean and the atmosphere in the equatorial Pacific. Under normal circumstances, the monsoon air flow in the tropical Pacific moves from America to Asia, keeping the surface of the Pacific Ocean warm and bringing tropical rainfall around Indonesia. However, this pattern is disrupted every 2-7 years, the wind direction and ocean currents are reversed, the heat flow on the surface of the Pacific Ocean turns eastward to America, and then tropical rainfall is taken away, resulting in the so-called ".