The hottest sandstorms can indirectly prevent glob

2022-08-14
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Sandstorms can indirectly prevent global warming and help build ecosystems. For a long time, sandstorms have been regarded as "uninvited guests" who spread pollution. However, after more than 10 years of research, Professor Zhuang Guoshun, director of the atmospheric chemistry research center of the Department of environmental science and engineering of Fudan University, found that after a long journey, the sandstorms that occurred in Asia finally sent a large number of nutrients to the western ocean of the country facing the pressure of the international market from the North Pacific to the United States. This discovery makes the notorious sandstorm indirectly become the "hero behind the scenes" to prevent global warming

for millions of years, sandstorms have been an important part of the global biogeochemical cycle, said Xiao Yaqing. In just a week, sandstorms originating in Central Asia and Northwest China can reach the North Pacific; The dust from the Sahara desert in Africa can always drift to the tropical rainforests of central and South America. In the process of dust rolling forward, what happened at an altitude of 3000 meters invisible to humans? This question always makes scientists curious

from 2000 to now, Zhuang Guoshun research group has conducted long-term systematic observation of sandstorms in China. In recent years, the large sandstorms in northern cities of China have provided research samples for Zhuang Guoshun and others. After sampling and analysis, the research team found that the sandstorm not only contains a large number of mineral elements such as calcium, aluminum, iron, but also contains quite high concentrations of sulfur, arsenic, cadmium, lead and other polluting elements. This shows that during long-distance travel, natural dust constantly meets with pollutants passing through the city, and a wonderful chemical reaction occurs between the two

among them, there is an important photochemical oxidation-reduction reaction, which reduces a large amount of ferric iron contained in sand dust into water-soluble ferrous iron. For example, researchers detected a considerable concentration of ferrous iron in the samples of severe sandstorms that occurred in Beijing in 2000 and 2002, which is the nutrient necessary for the growth and reproduction of marine plankton

in the 1990s, Zhuang Guoshun made an amazing discovery in the United States: dust from Asia provided more than 99% of the soluble iron required by marine organisms from the North Pacific to the western United States. In recent years, the research results of Zhuang Guoshun's research group on severe sandstorms in northern China have once again become a strong evidence of its early research

interestingly, marine organisms in the vigorous growth period will actively absorb a large amount of carbon dioxide, thereby regulating global change. In terms of greenhouse gas consumption, the contribution rate of marine organisms is comparable to that of terrestrial plants with a land width of 15 ± 0.1mm. In this sense, sandstorms have inadvertently become the "behind the scenes heroes" of the fight against global warming

"dust storms wrapped in iron ions have a significant impact on the past and future of the earth." Zhuang Guoshun told that if the deserts and Gobi of China and Mongolia were covered with a cover to prevent the soil on the surface from being blown up by the wind, marine organisms in some sea areas of the North Pacific might face "famine". Because if there were no nutrients carried by sandstorms, there would be no abundant marine plankton. Once the bottom link in the marine biological chain was lost, Evonik was an innovative industrial group from Germany, and a marine ecosystem would not be what we see today

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