Dust storm

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A sandstorm approaching Al Asad, Iraq, just before nightfall on April 27, 2005.
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A dust storm or sand storm is a meteorological phenomenon common in arid and semi-arid regions. Dust storms arise when a gust front or other strong wind blows loose sand and dirt from a dry surface. Particles are transported by saltation and suspension, a process that moves soil from one place and deposits it in another. The Sahara and drylands around the Arabian peninsula are the main terrestrial sources of airborne dust. Also with some contributions from Iran, Pakistan and India into the Arabian Sea, and China's significant storms deposit dust in the Pacific. It has been argued that recently, poor management of the Earth's drylands, such as neglecting the fallow system, are increasing dust storms size and frequency from desert margins and changing both the local and global climate, and also impacting local economies.[1] The term sandstorm is used most often in the context of desert sandstorms, especially in the Sahara, or places where sand is a more prevalent soil type than dirt or rock, when, in addition to fine particles obscuring visibility, a considerable amount of larger sand particles are blown closer to the surface. The term dust storm is more likely to be used when finer particles are blown long distances, especially when the dust storm affects urban areas.

Causes

Animation showing the global movement of dust from an Asian dust storm.

As the force of wind passing over loosely held particles increases, particles of sand first start to vibrate, then to saltate ("leap"). As they repeatedly strike the ground, they loosen and break off smaller particles of dust which then begin to travel in suspension. At wind speeds above that which causes the smallest to suspend, there will be a population of dust grains moving by a range of mechanisms: suspension, saltation and creep.[1]

A recent study finds that the initial saltation of sand particles induces a static electric field by friction. Saltating sand acquires a negative charge relative to the ground which in turn loosens more sand particles which then begin saltating. This process has been found to double the number of particles predicted by previous theories.[2] Particles become loosely held mainly due to drought or arid conditions, and varied wind causes. Gust fronts may be produced by the outflow of rain-cooled air from an intense thunderstorm. Or, the wind gusts may be produced by a dry cold front, that is, a cold front that is moving into a dry air mass and is producing no precipitation—the type of dust storm which was common during the Dust Bowl years in the U.S. Following the passage of a dry cold front, convective instability resulting from cooler air riding over heated ground can maintain the dust storm initiated at the front. In desert areas, dust and sand storms are most commonly caused by either thunderstorm outflows, or by strong pressure gradients which cause an increase in wind velocity over a wide area. The vertical extent of the dust or sand that is raised is largely determined by the stability of the atmosphere above the ground as well as by the weight of the particulates. In some cases, dust and sand may be confined to a relatively shallow layer by a low-lying temperature inversion. In other instances, dust (but not sand) may be lifted as high as 20,000 feet (6,100 m) high.

Drought and wind contribute to the emergence of dust storms, as do poor farming and grazing practices by exposing the dust and sand to the wind.

One poor farming practice which contributes to dust storms is dryland farming. Particularly poor dryland farming techniques are intensive tillage or not having established crops or cover crops when storms strike at particularly vulnerable times prior to revegetation.[3] In a semi-arid climate, these practices increase susceptibility to dust storms. However, soil conservation practices may be implemented to control wind erosion.

Physical and environmental effects

A convoy endure a dust storm in Iraq during the invasion of 2003.

A sandstorm can transport large volumes of sand unexpectedly. Dust storms can carry large amounts of dust, with the leading edge being composed of wall of thick dust as much as 1.6 km (0.99 mi) high. Dust and sand storms which come off the Sahara Desert are locally known as a simoom or simoon (sîmūm, sîmūn). The haboob (həbūb) is a sandstorm prevalent in the region of Sudan around Khartoum, with occurrences being most common in the summer.

The Sahara desert is a key source of dust storms, particularly the Bodélé Depression[4] and an area covering the confluence of Mauritania, Mali, and Algeria.[5]

Saharan dust storms have increased approximately 10-fold during the half-century since the 1950s, causing topsoil loss in Niger, Chad, northern Nigeria, and Burkina Faso. In Mauritania there were just two dust storms a year in the early 1960s, but there are about 80 a year today, according to Andrew Goudie, a professor of geography at Oxford University.[6][7] Levels of Saharan dust coming off the east coast of Africa in June (2007) were five times those observed in June 2006, and were the highest observed since at least 1999, which may have cooled Atlantic waters enough to slightly reduce hurricane activity in late 2007.[8][9][10]

Dust storms have also been shown to increase the spread of disease across the globe. Virus spores in the ground are blown into the atmosphere by the storms with the minute particles then acting like urban smog or acid rain.[11]

Prolonged and unprotected exposure of the respiratory system in a dust storm can also cause silicosis which, if left untreated, will lead to asphyxiation; silicosis is an incurable condition that also may lead to lung cancer.There is also the danger of keratoconjunctivitis sicca ("dry eyes") which, in severe cases without immediate and proper treatment, can lead to blindness.[12]

Economic impact

Dust storms cause soil loss from the dry lands, and worse, they preferentially remove organic matter and the nutrient-rich lightest particles, thereby reducing agricultural productivity. Also the abrasive effect of the storm damages young crop plants. Dust storms also reduced visibility affecting aircraft and road transportation. In addition dust storms also create problems due to complications of breathing in dust.[13]

Dust can also have beneficial effects where it deposits: Central and South American rain forests get most of their mineral nutrients from the Sahara; iron-poor ocean regions get iron; and dust in Hawaii increases plantain growth. In northern China as well as the mid-western U.S., ancient dust storm deposits known as loess are highly fertile soils, but they are also a significant source of contemporary dust storms when soil-securing vegetation is disturbed.[14]

Extraterrestrial dust storms

2001 Hellas Basin dust storm

Dust storms are not limited to Earth and have been known to form on other planets such as Mars.[15] These dust storms are much larger and more powerful than dust storm here on Earth with wind speeds topping 100 miles per hour (160 km/h).[16] Martian dust storms are formed when solar heating warms the Martian atmosphere and causes the air to move, lifting dust off the ground. The chance for storms is increased when there are great temperature variations like those seen at the equator during the Martian summer.[17]

See also

References

  1. ↑ 1.0 1.1 Victor R. Squires. "Physics, Mechanics and Processes of Dust and Sandstorms". Adelaide University, Australia. Retrieved 2007-07-29. 
  2. ↑ Electric Sand Findings, University of Michigan Jan. 6, 2008
  3. ↑ "Dust Storms Chapter". Emergency Management Plan. State of Oregon. 
  4. ↑ The Bodélé depression: a single spot in the Sahara that provides most of the mineral dust to the Amazon forest. Ilan Koren et al. 2006 Environ. Res. Lett. 1 014005 (5pp) doi:10.1088/1748-9326/1/1/014005
  5. ↑ Saharan Dust: Sources and Trajectories N. J. Middleton, A. S. Goudie Transactions of the Institute of British Geographers, New Series, Vol. 26, No. 2 (2001), pp. 165-181
  6. ↑ ENVIRONMENT: Around the Globe, Farmers Losing Ground Analysis by Lester R. Brown (Jun 27, 2007)
  7. ↑ http://www.earth-policy.org/Books/Seg/PB2ch05_ss3.htm LOSING SOIL Lester R. Brown
  8. ↑ http://www.sciam.com/article.cfm?alias=scientists-examine-africa&chanId=sa003&modsrc=reuters Scientists examine African dust link to hurricanes ScientificAmerican.com August 10, 2007
  9. ↑ Storm Report: Dry air inhibits storms Saharan winds limit formation in warm Gulf Jim Bradshaw, 5 July 2007
  10. ↑ NASA: Saharan Dust Has Chilling Effect on North Atlantic
  11. ↑ Vidal, John (27 September 2009). "Dust storms spread deadly diseases worldwide". London: guardian.co.uk. Retrieved May 1, 2010. 
  12. ↑ "textservice". Globe News. Retrieved 2013-11-20. 
  13. ↑ "Dust Between Tigris and Euphrates Rivers, Iraq". Earth Snapshot. March 3, 2012. Retrieved 2013-11-20. 
  14. ↑ "the Dust Bowl". Mishe Vanatta. Retrieved 2013-11-20. 
  15. ↑ "Discovery Monitoring and Predicting Extraterrestrial Weather". National Science foundation. Retrieved 2013-11-21. 
  16. ↑ "Spacecraft Monitoring Martian Dust Storm". National Air And Space Administration. Retrieved 2013-11-21. 
  17. ↑ "THEMIS keeps an eye on Mars for dust". THEMIS. Retrieved 2013-11-21. 

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