Abstract For many years, climate scientists have been discussing the feasibility of spraying water-based sulfates into the sky to reflect and scatter sunlight to cool the Earth. This geoengineering method is essentially a simulation of the cooling effect of volcanic eruptions, but it has not been carried out because of its controversy...
For many years, climate scientists have been discussing the feasibility of spraying water-based sulfates into the sky to reflect and scatter sunlight to cool the Earth. This geoengineering method is essentially a simulation of the cooling effect of volcanic eruptions, but it has not been tested to date because of its controversy. Researchers at Harvard University in the United States have calculated that it may be more effective to try this "solar radiation management" with solid nanoparticles of diamond or alumina, and the environmental damage is less than that of sulfate. According to "Nature" magazine website on the 26th, Harvard University's atmospheric modeling expert Debra Wiesenstein said that they published the latest research in the journal "Atmospheric Chemistry and Physics" by analyzing these nanoparticles in the atmosphere. The physical and chemical reactions of matter first simulated the effects of these particles in detail and compared them to sulfates.
Studies have shown that the impact of alumina and diamond dust on the ozone layer is significantly smaller, resulting in less stratospheric warming, and less diffuse light on the Earth's surface. In addition, the cooling effect of equal weight alumina dust and sulphate spray is similar, while the effect of diamond dust is more than 50%.
Of course, the cost of using diamond dust is not a small amount. It takes hundreds of thousands of tons of dust every year to offset a few percent of anthropogenic greenhouse gases, which cost billions of dollars a year at current prices. Although the research team firmly believes that the cost of synthetic diamonds will decline in the future, they still focus on alumina because it is easier to produce and its chemical performance has been studied more thoroughly.
But scientists warn that neither alumina dust nor diamond dust has an unknown risk. Research on volcanoes has given people a good understanding of sulphate, and the chemical properties of these solid dusts, such as their surface catalyzed chemical reactions, are not well understood. The research team at Harvard University is now passing laboratory experiments. To make up this lesson.
Editor-in-chief
The earth is too hot, she needs to cool down. But letting this big guy with a waist circumference of 40,000 kilometers cool down is not as easy as cooling people. Climatologists have warned that global temperatures will rise by 1.5 ° C - 6 ° C in the next 100 years, and global warming will directly or indirectly affect people's lives. In order to cool the earth, scientists have put forward a lot of whimsy. Harvard University atmospheric modeling experts used solid dust to cool the earth this time, which is even more "brain-opening", and even a little waste. People can't help but sigh: these particles suspended in the air, in addition to giving trouble to humans, finally have their own big role!
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