They find particles of dust from the Sahara at distances that defy gravity – Correo del Orinoco



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Large amounts of dust particles from the Sahara desert were found at a distance of up to 3,500 kilometers in the Caribbean, which could be contributing to global warming, according to a study by the Royal Dutch Institute for Maritime Research. (NIOZ) and recently published in the journal Science Advances.

Dust affects the delicate balance between sunlight and the heat emitted by the Earth, the development of tropical cyclones and the formation of clouds. The winds carry dust particles from the western Sahara to the Atlantic Ocean.

The researchers collected samples of this dust in floating buoys and underwater sediment traps at five sites in the Atlantic Ocean between 2013 and 2016.

"Existing ideas do not conceive that such massive particles travel in the atmosphere at long distances, suggesting that there is an atmospheric process, or a combination of processes still unknown, that keeps them in the air," said one of the authors of the study. study, Giles Harrison, quoted by the scientific portal Phys.org.

"This evidence that dust and ashes are transported here is significant because these particles influence the transfer of radiation around the Earth and the carbon cycles in the oceans," Harrison added.

The role of large particles is underestimated
In addition, the size of the patrols found is 0.45mm in diameter, which means that they are almost 50 times larger than scientists thought it was possible to transport at such distance through global winds.

The authors of the study argue that this indicates that the role of large dust particles, especially quartz, both in cloud formation and in the carbon cycle in the oceans, has been underestimated.

According to the researchers, the role they play in the atmosphere, with its far-reaching unexpected effects, should be included in future climate models.

The study also suggests that the amount of dust removed from the atmosphere by rain, rather than by gravity, is greater than previously assumed. This has implications for the oceans, since the droplets formed by the dust particles are very acidic. In addition, large particles sink faster, bringing nutrients to the deeper parts of the ocean.

Both factors affect the growth of algae and therefore food chains and the carbon cycle in the ocean.

T / RT
F / File

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