digplanet beta 1: Athena
Share digplanet:

Agriculture

Applied sciences

Arts

Belief

Business

Chronology

Culture

Education

Environment

Geography

Health

History

Humanities

Language

Law

Life

Mathematics

Nature

People

Politics

Science

Society

Technology

Dust Plumes off Western Africa.

Mineral dust is a term used to indicate atmospheric aerosols originated from the suspension of minerals constituting the soil, being composed of various oxides and carbonates. Human activities lead to 30% of the dust load in the atmosphere. The Sahara is the major source of mineral dust, which subsequently spreads across the Mediterranean (where is the origin of rain dust) and Caribbean seas into northern South America, Central America, North America, and Europe. Additionally, it plays a significant role in the nutrient inflow to the Amazon rainforest.[1] The Gobi Desert is another source of dust in the atmosphere, which affects eastern Asia and western North America.

Characteristics[edit]

Mineral dust is mainly constituted of the oxides (SiO2, Al2O3, FeO, Fe2O3, CaO, and others) and carbonates (CaCO3, MgCO3) that constitute the Earth's crust.

Global mineral dust emissions are estimated at 1000-5000 millions of tons per year,[2] of which the largest part is attributed to deserts. Although this aerosol class is usually considered of natural origin, it is estimated that about a quarter of mineral dust emissions could be ascribed to human activities through desertification and land use changes.[3]

Large dust concentrations may cause problems to people having respiratory problems. Another effect of dust clouds is more colorful sunsets.

Saharan dust[edit]

The Sahara is the major source on Earth of mineral dust (60-200 millions of tons per year). Saharan dust can be lifted by convection over hot desert areas, and can thus reach very high altitudes; from there it can be transported worldwide by winds, covering distances of thousands of kilometers. The dust combined with the hot dry air of the Sahara Desert often forms an atmospheric layer called the Saharan Air Layer which has significant effects on tropical weather, especially as it interferes with the development of hurricanes.

There is a large variability in the dust transport across the Atlantic into the Caribbean and Florida from year to year. Due to the trade winds, very large concentrations of mineral dust can be found in the tropical Atlantic, reaching the Caribbean; moreover episodic transport to the Mediterranean region as well as Northern Europe is observed. Saharan plumes can form iberulites (a particular tropospheric aggregation of aerosols) when these plumes travel through North Africa and the eastern North Atlantic Ocean, and often reach the circum-Mediterranean areas of Western Europe. In the Mediterranean region, Saharan dust is important as it represents the major source of nutrients for phytoplankton and other aquatic organisms. Saharan dust carries the fungus Aspergillus sydowii and others.[4] Aspergillus borne by Saharan dust falls into the Caribbean Sea and possibly infects coral reefs with Sea Fan disease (aspergillosis). It also has been linked to increased incidence of pediatric asthma attacks in the Caribbean. Since 1970, dust outbreaks have worsened due to periods of drought in Africa.[5] Dust events have been linked to a decline in the health of coral reefs across the Caribbean and Florida, primarily since the 1970s.[6]

Effect on hurricane frequency[edit]

According to a NASA article,[7] NASA satellites have shown that "the chilling effect of dust was responsible for one-third of the drop in North Atlantic sea surface temperatures between June 2005 and 2006, possibly contributing to the difference in hurricane activity between the two seasons." There were only 5 hurricanes in 2006 and compared with 15 in 2005.

It is known that one of the major factors that create hurricanes is warm water temperatures on the surface of the ocean. Evidence shows that dust from the Sahara desert caused surface temperatures to be cooler in 2006 than in 2005.

Asian dust[edit]

Main article: Asian dust
Aizuwakamatsu, Japan shrouded in Asian Dust on April 2nd, 2007.
Aizuwakamatsu, Japan with clear skies.

In Eastern Asia, mineral dust events originated in springtime in the Gobi Desert (Southern Mongolia and Northern China) gives rise to the phenomenon called Asian dust. The aerosols are carried eastward by prevailing winds, and pass over China, Korea, and Japan. Sometimes, significant concentrations of dust can be carried as far as the Western United States.[8] Areas affected by Asian dust experience decreased visibility and health problems, such as sore throat and respiratory difficulties. The effects of Asian dust, however, are not strictly negative, as it is thought that its deposition enrichs the soil with important trace minerals.

An American study[citation needed] analyzing the composition of Asian dust events reaching Colorado associates them to the presence of carbon monoxide, possibly incorporated in the air mass as it passes over industrialized regions in Asia. Although dust storms in the Gobi desert have occurred from time to time throughout history, they became a pronounced problem in the second half of the 20th century due to intensified agricultural pressure and desertification.

See also[edit]

References[edit]

  1. ^ Koren, I.; Kaufman, Y. J.; Washington, R.; Todd, M. C.; Rudich, Y.; Martins, J. V.; Rosenfeld, D. (2006). "The Bodélé depression: a single spot in the Sahara that provides most of the mineral dust to the Amazon forest". Environmental Research Letters 1: 014005. Bibcode:2006ERL.....1a4005K. doi:10.1088/1748-9326/1/1/014005.  edit
  2. ^ Huneeus, N.; Schulz, M.; Balkanski, Y.; Griesfeller, J.; Prospero, J.; Kinne, S.; Bauer, S.; Boucher, O.; Chin, M.; Dentener, F.; Diehl, T.; Easter, R.; Fillmore, D.; Ghan, S.; Ginoux, P.; Grini, A.; Horowitz, L.; Koch, D.; Krol, M. C.; Landing, W.; Liu, X.; Mahowald, N.; Miller, R.; Morcrette, J. -J.; Myhre, G.; Penner, J.; Perlwitz, J.; Stier, P.; Takemura, T.; Zender, C. S. (2011). "Global dust model intercomparison in Aero Com phase I". Atmospheric Chemistry and Physics 11 (15): 7781. doi:10.5194/acp-11-7781-2011.  edit
  3. ^ Ginoux, P.; Prospero, J. M.; Gill, T. E.; Hsu, N. C.; Zhao, M. (2012). "Global-scale attribution of anthropogenic and natural dust sources and their emission rates based on MODIS Deep Blue aerosol products". Reviews of Geophysics 50 (3). doi:10.1029/2012RG000388.  edit
  4. ^ Schlesinger, P.; Mamane, Y.; Grishkan, I. (2006). "Transport of microorganisms to Israel during Saharan dust events". Aerobiologia 22 (4): 259. doi:10.1007/s10453-006-9038-7.  edit "On a spring clear day, the persisting airborne fungi were Alternaria alternata, Geotrichum candidum, Penicillium chrysogenum, and P. glabrum. However, during two dust events the fungal population was dominated by Alternaria alternata, Aspergillus fumigatus, A. niger, A. thomii, Cladosporium cladosporioides, Penicillium chrysogenum, and P. griseoroseum. This study suggests that Saharan and other desert dust events in the East Mediterranean have a significant effect on the airborne microbial populations, which might impact on health, agriculture, and ecology."
  5. ^ Usinfo.state.gov. Study Says African Dust Affects Climate in U.S., Caribbean. Retrieved on 2007-06-10.
  6. ^ U. S. Geological Survey. Coral Mortality and African Dust. Retrieved on 2007-06-10.
  7. ^ Sharan Dust has chilling effect on North Atlantic
  8. ^ University of Utah Department of Meteorology. Dr. Kevin Perry is quoted in BALTIMORE SUN article, "Blowing in the Wind". Retrieved on 2007-06-10.
  • Kubilay and Saydam, "Trace elements in atmospheric particulates over the Eastern Mediterranean: concentration, sources, and temporal variability", Atmospheric Environment 29, 2289-2300 (1995).
  • Morales, "The airborne transport of Saharan dust: a review", Climate Change 9, 219-241 (1986).
  • Loyë-Pilot et al., "Influence of Saharan dust on the rain acidity and atmospheric input to the Mediterranean", Nature 321, 427-428 (1986).
  • Sokolik and Toon, "Direct radiative forcing by anthropogenic airborne mineral aerosols", Nature 381, 681-683 (1996).
  • Tegen and Fung, "Contribution to the atmospheric mineral aerosol load from land surface modification", Journal of Geophysical Research 100, 18707-18726 (1995).

External links[edit]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Mineral_dust — Please support Wikipedia.
This page uses Creative Commons Licensed content from Wikipedia. A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia.
114715 videos foundNext > 

Rock Dust 50 lbs with Free Shipping - Lowest Price I Have Found!

John from http://www.growingyourgreens.com/ shares the LOWEST price he has ever found for 2 kinds of Rock Dust which includes FREE SHIPPING. In this episode,...

Iron solubility in mineral dust and aerosol generated from soil samples

Defensa del Trabajo Fin de Título de Máster de Vanesa del Pilar Jerez Sarmiento; tutora María Dolores Gelado Caballero. Acto celebrado en la Sala de grado de...

Grow Larger Vegetables with Rock Dust - Benefits and How to Apply

John from http://www.growingyourgreens.com is visited by Don Weaver, who wrote the book on rock dust and soil remineralization. In this eposide, learn about ...

Portable Farms Mineral Rock Dust With Phyllis Davis

Vermiculture Worm Bin Mineral Dust for Gizzards

Worms need Rock dust. They use it for their Gizzards (ie chickens have gizzards). Worms have no teeth, so the rocks in the gizzards help break down food part...

Azomite

I purchased a bag of rock dust online, this bag from a company called Azomite. What is rock dust? Rockdust, also known as rock powders, rock minerals, soil r...

Rock Dust

www.binnsoilnutrients.com There is a vital key to healthy abundant food in the simple act of adding rock dust from a volcanic rock to the soil we grow our fo...

Rock Dust Organic Remineralisation

www.binnsoilnutrients.com There is a vital key to healthy abundant food in the simple act of adding rock dust from a volcanic rock to the soil we grow our fo...

Mineral Dust

Mineral Dust Noah23 Composer: Tree Vortex Writer: Noah23 Auto-generated by YouTube.

Angul WAG7 Mineral Freight Dust Trail

WAG7 59 wagon Freight with some kinda mineral / coal leaves a smoky dust trail at Balarambati The reason why WAP4 Mumbai Howrah Mail was whining about - http...

114715 videos foundNext > 

5 news items

 
Lab Manager Laboratory News
Mon, 17 Nov 2014 22:22:30 -0800

Halevy and Head showed that in an atmosphere already as dusty as that of Mars, the sulfuric acid mostly forms thin coatings around particles of mineral dust and volcanic ash, subduing the added cooling. The net effect, according to the model the ...

Great Lakes Echo

Great Lakes Echo
Tue, 04 Nov 2014 21:15:00 -0800

Sending this remote sensing instrument to the space station will fill the impending data gap currently filled by another satellite that will soon be retired. CATS will measure clouds and air pollution such as, mineral dust, smoke and other particulates ...

The Conversation UK

The Conversation UK
Mon, 03 Nov 2014 12:15:00 -0800

... University of Leeds to work on a NERC-funded project where he combined the knowledge in geochemistry with atmospheric sciences and global aerosol modeling to understand the atmospheric processing of iron and phosphorous in mineral dust.
 
Vernon Morning Star
Wed, 22 Oct 2014 05:32:48 -0700

Mineral dust from land all over the earth is the No. 1 source of particulates in the Earth's atmosphere and are estimated at 100 to 500 million tons per year. Some particulates occur naturally, originating from volcanoes, dust storms, deserts, forest ...
 
uniprotokolle (Pressemitteilung)
Fri, 24 Oct 2014 03:07:30 -0700

Die von TROPOS initiierte und koordinierte DFG-Forschergruppe SAMUM (Saharan Mineral Dust Experiment) führte eines der weltweit größten Feldexperimente dieser Art durch und legte den Grundstein für eine Reihe weiterer erfolgreicher Kooperationen.
Loading

Oops, we seem to be having trouble contacting Twitter

Support Wikipedia

A portion of the proceeds from advertising on Digplanet goes to supporting Wikipedia. Please add your support for Wikipedia!

Searchlight Group

Digplanet also receives support from Searchlight Group. Visit Searchlight