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Posts tagged Dust

Dust and Kármán Vortices by Canary Islands – June 23rd, 2013

21.0N 19.1W

June 23rd, 2013 Category: Clouds, Dust Storms, Image of the day VIIRSSuomi-NPP

West Africa – June 22nd, 2013

Named after the engineer and fluid dynamicist Theodore von Kármán, in fluid dynamics, a Kármán vortex street is a repeating pattern of swirling vortices that are created when the flow of a fluid separates unsteadily as it moves around blunt bodies. Here, this phenomenon can be seen in the upper left quadrant, as spiralled cloud patterns southwest of the Canary Islands. In the lower left quadrant, dust can be seen blowing off the coasts of Mauritania and Senegal.

Kármán Vortex Streets Trailing Off Cape Verde and Canary Islands – June 20th, 2013

21.8N 18.5W

June 20th, 2013 Category: Clouds, Image of the day VIIRSSuomi-NPP

West Africa – June 19th, 2013

West of Western Sahara, Mauritania and Senegal, off the coast of West Africa, is an atmospheric phenomenon known as Kármán Vortex Streets. These parallel rows of oppositely spinning vortices, caused by the unsteady separation of flow of a fluid around blunt bodies, can be seen trailing off the Canary Islands (above) and off the Cape Verde islands (below). Some dust can also be seen spreading off the coast of Mauritania.

Desertification and Vanishing Lake Chad

12.8N 14.0E

June 19th, 2013 Category: Climate Change MODISTerra

Chad – June 19th, 2013

As you approach the Lake Chad basin the air is dusty, the wind is fierce and unrelenting, the plants are wilting and the earth is turning into sand dunes. The sparse vegetation is occasionally broken by withered trees and shrubs. The lives of herders, fisherfolk and farmers are teetering on the edge as the lake dries up before their eyes.

Vegetation and water, the traditional staples of livelihood for the Lake Chad community dwellers, are vanishing. Vultures feast on dead cows as drought and desertification take their toll. The UN Food and Agriculture Organization (FAO) has called the situation an “ecological catastrophe,” predicting that the lake could disappear this century.

The Lake Chad basin is one of the most important agricultural heritage sites in the world, providing a lifeline to nearly 30 million people in four countries — Nigeria, Cameroon, Chad and Niger. Lake Chad is located in the far west of Chad and the northeast of Nigeria. Parts of the lake also extend to Niger and Cameroon. It is fed mainly by the Chari River through the Lagone tributary, which used to provide 90 per cent of its water. It was once Africa’s largest water reservoir in the Sahel region, covering an area of about 26,000 square kilometres; however, by 2001 the lake covered less than one-fifth of that area (click here for more information).

Plumes of Dust Off Coast of Namib Desert, Namibia

23S 15.1E

June 17th, 2013 Category: Dust Storms MODISTerra

Namibia – June 17th, 2013

Plumes of dust blow southwestwardward off the coast of Namibia, by both the rocky, tan northern portion and the sandy, orange southern portion of the Namib Desert. In the full image, similar wispy plumes of dust can be seen much further southward along the coast, for much of the length of the sandy desert.

Dust Blowing Over Sarygamysh Lake, Uzbekistan

43.2N 57.5E

June 16th, 2013 Category: Dust Storms MODISAqua

Uzbekistan – June 16th, 2013

Significant desertification, characterized by degradation of the land and natural resources to the point that they can no longer be used, has been occurring in the region around the Aral Sea. A decline in the groundwater level in the deltas of the Amu Darya and Syr Darya rivers has contributed to the piling up of salt at the surface, resulting in the death of plants. The death of vegetation, in turn, has resulted in intensified winds, causing more dust storms in the area. Here, dust can be seen blowing across Sarygamysh Lake, in Uzbekistan, southwest of the Aral Sea.

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