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Posts tagged Canary Islands

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.

Vortex Streets by Canary Islands and Dust Off Mauritania

26.8N 17W

April 18th, 2013 Category: Clouds, Dust Storms

Mauritania – April 17th, 2013

The interesting paisley swirled cloud patterns southwest of the Canary Islands are Kármán vortex streets. In fluid dynamics, these are repeating patterns of swirling vortices caused by the unsteady separation of flow of a fluid around blunt bodies – in this case, the islands of the archipelago. Visible in the lower part of the image is the Bay of Arguin, in Mauritania, and a light veil of dust blowing off the coast.

Dust From Western Sahara to Mauritania

23.6N 15.9W

January 14th, 2013 Category: Climate Change, Dust Storms

West Africa – January 7th, 2013

Sahara Desert dust blows due west off the coast of West Africa. It is thickest from Western Sahara’s Dakhla Peninsula to below the Bay of Arguin, in Mauritania. The dust has not spread northwards into Morocco or over the Canary Islands (top). However, winds can carry such clouds of dust across the Atlantic Ocean, affecting the Caribbean, Gulf of Mexico and southern and eastern USA.

The presence of high concentrations of dust for such long periods of time may have a negative impact on human health. Also, if increased aridity caused large increases in dust transport to the ocean, there could be major consequences that transcend the direct impact on marine organisms. Changes in climate would also affect the amounts and the types of microorganisms associated with dust.

Parallel Dust Plumes Inland and Off Western Sahara Coast

25.7N 16.2W

January 3rd, 2013 Category: Dust Storms

Mauritania – December 28th, 2012

Plumes of dust blow across Western Sahara and northern Mauritania. Dust plumes, appearing as parallel streaks, are visible both inland and off the coast. A thinner cloud of dust can be seen blowing further west over the Atlantic Ocean. Visible to the north of this cloud are the Canary Islands.