An author of a book on the 1930s Dust Bowl called that cataclysmic event perhaps the greatest manmade disaster in human history. Le Dust Bowl fut donc la cause de catastrophes agricoles et d'exodes ruraux dans le centre des États-Unis. We reproduced this surprising response by experimentally imposing extreme drought in two native grasslands. A dust storm arrived in Washington all the way from the Great Plains. With nearly half the country currently in drought and a winter forecast predicting continued dry weather for many of the afflicted regions, dust storms could become an even bigger threat.

Our findings highlight how extreme drought can indirectly alter precipitation seasonality and shift ecosystem phenology, affecting function in ways not predictable from key traits of C3 and C4 species. “Those would be the ingredients for another Dust Bowl.”. Winds were clocked at 60 mph. During the Dust Bowl, Colorado’s plains also suffered from grasshopper infestations. The region received a meager 126 total inches of moisture between 1930 and 1939, 205 fewer inches than the previous decade. In April, a paper published in the journal Science said the Southwestern part of North America may be entering a megadrought worse than anything seen in 1,200 years. This article is a PNAS Direct Submission.

Rising Great Plains dust levels stir concerns. The destructive storms earned the decade the moniker the “dirty thirties.” The storms destroyed millions of farmland acres and induced mental and physical anguish among residents. The source of Jefferson County’s problem lies 100 miles to the south, where Wickiup Reservoir stands empty. Les labours sont mieux faits. Sans se rendre compte qu’ils sont en train de préparer le prochain désastre. Le gouvernement des États-Unis a réagi en créant un Service de conservation des sols (actuellement le Natural Resources Conservation Service), en déployant des efforts importants dans la lutte contre l'érosion (ceinture d'arbres, nouvelles techniques agricoles, etc.) Cars come to a standstill, for no light in the world can penetrate that swirling murk... We live with the dust, eat it, sleep with it, watch it strip us of possessions and the hope of possessions.

A drought of that length raises the specter of the 1930s Dust Bowl, in which more than 20 million hectares of farmland lost soil to airborne dust.

Un livre passionnant et dense qui montre, à partir du Dust Bowl, comment le gouvernement Roosevelt a fait appel à des experts de l’environnement pour mettre en place une politique de conservation des ressources. Besides blotting out the sun, dust storms strip valuable nutrients from the soils, making the land less productive, and create a significant health hazard at a time when a respiratory illness is sickening people around the world, according to Science. Image credit: Carey Lumeng (University of Michigan, Ann Arbor, MI). The Works Progress Administration (WPA), created by President Franklin Delano Roosevelt on April 8, 1935, aimed to provide both direct and long-term relief. Naval Research Laboratory and the paper’s first author, in a statement.

By Roland Pease Oct. 20, 2020 , 10:50 AM. Grasshoppers thrived in the desiccated prairie soils and first descended upon Colorado in 1934.

Lorsque l’une de ces tempêtes finit, une journée, par toucher New York, enfin, au point d’assombrir la ville comme si on était en pleine nuit, la nation commence à comprendre l’ampleur du drame : en effet, au cours de cette tempete de mai 1934, ce sont 12 millions de tonnes de poussière qui sont déposées dans les grandes villes de l’Est comme New York et Washington, et même jusque sur des bateaux, au large, à 300 miles de la côte. "The impact is like a shovelful of fine sand flung against the face," Avis D. Carlson wrote in a New Republic article. Ce phénomène est dû à la conjonction d'épisodes de sécheresses, qui ont succédé à une période d'humidité anormale dans ce qui était appelé le Grand Désert américain et à une agriculture intensive sans technique de prévention de l'érosion.

Dust was not uncommon in the semiarid regions of Colorado when the prairie winds blew, so it was no surprise when a few “dusters”—large dust clouds—appeared in 1931. Data deposition: The data reported in this paper are available in Dryad (https://datadryad.org/stash/dataset/doi:10.5061/dryad.3j9kd51dv). In 1932 the dusters returned with greater intensity. Hardy prairie grasses would have likely withstood the drought, but crops covering the newly converted tracts swiftly bit the proverbial dust, which loosened the grip their roots had on the soil. The Dust Bowl encompassed the entire Great Plains, stretching from southwestern Kansas into southeastern Colorado, northeastern New Mexico, and the panhandles of Oklahoma and Texas.

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