According to WND media reports, scientists seriously underestimated the impact of air pollution. For some time, the scientific community has known that global warming is caused by anthropogenic greenhouse gases and air pollution in the form of aerosols.
However, the latest study published in the journal Science by Professor Daniel Rosenfeld of the Hebrew University of Jerusalem in Israel pointed out that the degree of aerosol cooling of the Earth is seriously underestimated, so it is necessary to recalculate the climate change model to more accurately predict global warming. speed.
Aerosols are tiny particles that float in the air. They can be formed naturally (such as desert dust) or artificially formed (such as coal, smoke in car exhaust). Aerosols cool our environment by enhancing the reflection of sunlight (heat) back into the clouds of space.
As for the first type, the cloud is formed when the wind rises and cools. However, the composition of the cloud is largely determined by aerosols. The more aerosol particles a shallow cloud contains, the smaller the water droplets it contains. When these water droplets are combined, it will rain. Because the water droplets take longer to combine together than the large water droplets, the aerosol-filled or “contaminated” cloud contains more water and lasts longer in the sky (when they wait for the droplets to condense and After the rain, the clouds will dissipate and cover a larger area. For a long time, aerosol-filled clouds have reflected more solar energy back into space, cooling the Earth’s overall temperature.
To what extent does the aerosol cool our temperature? So far, all estimates have been unreliable, because it is not possible to separate the effects of rising winds that make up the cloud from the effects of aerosols that determine their composition.
Rosenfeld and his colleague Zhu Yannian of the Shaanxi Meteorological Institute proposed a new method for calculating the vertical wind and aerosol droplets using satellite images. They applied this method to the low-lying clouds above the ocean between the equator and 40° south latitude.
Using this new approach, Rosenfeld and his colleagues were able to more accurately calculate the cooling effect of aerosols on the Earth’s energy budget. Moreover, they found that the cooling effect of the aerosol was almost twice as high as previously thought.
If this is true, then why does the earth warmer, not cold? Although global warming is concerned, aerosol pollution rates in automobiles, agriculture and power plants remain high. For Rosenfeld, this difference may point to a deeper, more disturbing reality. “If the aerosol does have a greater cooling effect than the previous estimate, then the warming effect of greenhouse gases is larger than we think,” he said. “This makes greenhouse gas emissions greatly offset the cooling effect of aerosols, so The extent of global warming is greater than we thought.”
Our planet is warming, and despite the fact that aerosols are cooling at a higher rate than previously thought, this fact has brought us warnings. People around the world need to work together to improve air quality by developing cleaner fuels and reducing coal combustion.
According to Rosenfeld, there is another explanation for why the earth is warming. The assumption is that even though aerosols have been cooling the earth at a greater rate, it may be the warming of aerosols suspended in deep clouds. The Israel Space Agency and the French National Space Research Center jointly developed a new satellite capable of investigating this deep cloud phenomenon, and Professor Rosenfeld is the principal researcher of the centre.
Either way, the conclusions are the same. Our current global climate predictions do not correctly account for the significant impact of aerosols on the overall energy balance of the Earth. In addition, scientists predict that temperatures will rise by 1.5 to 4.5 degrees Celsius by the end of the 21st century. Rosenfeld’s research means that scientists will have to rethink their global warming predictions to provide us with more accurate estimates and predictions of the Earth’s climate.