Dust cloud from the Sahara has reached US

A huge dust plume from the Sahara desert reached the South
USA. Having started its movement from the North of the African continent for more than a week ago, a dust cloud covered a distance more than 5000 kilometers through
The Atlantic ocean, the Caribbean and the Gulf of Mexico, reports The Weather Channel.

For information, the world meteorological organization
(WMO), which produces annual reports on atmospheric dust, sand and dust storms are usually formed under the influence of strong
pressure gradients, associated with cyclones, which lead to increase
wind speed over a large area. Strong wind up in the air naked
dry soil particles, sand and dust, which are then due to the turbulent
mixing and convective upward flows rise to a higher
levels of the troposphere and can be transported by winds for significant distances.

The movement of dust clouds from the Northern part
the African continent across the Atlantic ocean was recorded by the satellites
NASA
on 13 June. By 17 June, the dust plume had already reached the Eastern
The Caribbean, and then spread from the coast of South America to
the North-Western part of the Yucatan Peninsula. At
information NASA 18
Jun most dense part of the plume stretched for 2500 miles, and by 24 June
more than 5000. At the time of this writing, the cloud reached the southern
USA.

Dust plumes out of Africa migrated through tropical
part of the Atlantic ocean each year from late spring to early autumn,
this year, however, the length and thickness of the dust layer was extremely high. As reported by the WMO, on the island of Martinique, in Guadeloupe and in Puerto Rico the level of air pollution
dust particles is recognized as a health hazard. So, in Martinique and Guadeloupe
levels of airborne particles smaller than 10 microns (particles PM10)
exceeded 400 micrograms per cubic meter, and in Puerto Rico — 500
micrograms per cubic meter. This is the highest amount in 20 years of observations.

The level of the aerosol optical thickness values
determining turbidity of the atmosphere, measured on the Islands of Martinique, Barbados, Guadeloupe and Puerto Rico, was a record for all history of observations. According to Olga L. Mayol-Bracero (Olga L. Mayol-Bracero), University Professor
Puerto Rico, and Dr. Andrea Seeley (Andrea Sealy) from the Caribbean Institute of meteorology and hydrology, the scale of the event can be called historical.

Dust, portable sand and dust storms, can present
threat to human health, according to WMO. So, particle size less than 10
micrometers, getting into the upper respiratory tract can cause pneumonia, asthma,
allergic rhinitis, bronchitis and silicosis. Most small particles through the bottom
the respiratory tract to enter the bloodstream causing cardiovascular
violations. In addition, dust can be transferred to the infectious
diseases, such as meningococcal meningitis, and coccidioidomycosis.

Andrey Fokin

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