Harmattan: Difference between revisions
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==Effects== |
==Effects== |
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In some countries in West Africa, the heavy amount of dust in the air can severely limit visibility and block the sun for several days,<ref>{{cite web |url= http://www.temoust.org/spip.php?article3206|title=Tuareg unrest |date=2007-09-07|accessdate=2007-10-08 |work=BBC, via Temoust |archiveurl = http://web.archive.org/web/20071230031550/http://www.temoust.org/spip.php?article3206 <!-- Bot retrieved archive --> |archivedate = 2007-12-30}}</ref> comparable to a heavy [[fog]]. It can even break the |
In some countries in West Africa, the heavy amount of dust in the air can severely limit visibility and block the sun for several days,<ref>{{cite web |url= http://www.temoust.org/spip.php?article3206|title=Tuareg unrest |date=2007-09-07|accessdate=2007-10-08 |work=BBC, via Temoust |archiveurl = http://web.archive.org/web/20071230031550/http://www.temoust.org/spip.php?article3206 <!-- Bot retrieved archive --> |archivedate = 2007-12-30}}</ref> comparable to a heavy [[fog]]. It can even break the trunks of the pine trees, growing in that region, through their dryness. The effect caused by the dust and sand stirred by these winds is known as the Harmattan haze, which costs airlines millions of dollars in cancelled and diverted flights each year,<ref>[http://allafrica.com/stories/201301150511.html This Day: Nigerian Civil Aviation warns pilots, airlines of Harmattan haze]</ref><ref name=Re>{{cite web |url=http://af.reuters.com/article/topNews/idAFJOE81706Z20120208 |title=Giant dust cloud chokes west Africa |author=Valdmanis, Richard |date=2012-02-08 |publisher=Reuters |accessdate=2012-02-09}}</ref> and risks public health by increasing meningitis cases.<ref name=Re/> The interaction of the Harmattan with [[monsoon]] winds can cause [[tornado]]es.<ref name=eb/> Humidity drops to as low as 15 percent and can result in spontaneous nosebleeds for some. The wind can cause severe crop damage.<ref>{{cite news | url=http://www.ft.com/cms/s/0/b681e5f0-42b7-11e1-b756-00144feab49a.html#axzz1kkb8Prrr | title=Saharan wind stirs cocoa market | work=Financial Times | date=January 19, 2012 | accessdate=January 28, 2012 | author=Terazono, Emiko and Blas, Javier}}</ref> |
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==See also== |
==See also== |
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Revision as of 02:20, 6 April 2014
The Harmattan is a dry and dusty West African trade wind. This northeasterly wind blows from the Sahara into the Gulf of Guinea between the end of November and the middle of March (winter). The temperatures can be as low as 3 degrees Celsius.[1] The name comes from or is related to an Akan cognate.[2]
On its passage over the desert it picks up fine dust particles (between 0.5 and 10 micrometres).
Effects
In some countries in West Africa, the heavy amount of dust in the air can severely limit visibility and block the sun for several days,[3] comparable to a heavy fog. It can even break the trunks of the pine trees, growing in that region, through their dryness. The effect caused by the dust and sand stirred by these winds is known as the Harmattan haze, which costs airlines millions of dollars in cancelled and diverted flights each year,[4][5] and risks public health by increasing meningitis cases.[5] The interaction of the Harmattan with monsoon winds can cause tornadoes.[1] Humidity drops to as low as 15 percent and can result in spontaneous nosebleeds for some. The wind can cause severe crop damage.[6]
See also
References
- ^ a b "Harmattan". Encyclopædia Britannica. Chicago: Encyclopædia Britannica, Inc. 2007.
- ^ "Harmattan". Merriam-Webster.com. Merriam-Webster, Inc harmattan. 2012.
{{cite encyclopedia}}: External link in|publisher= - ^ "Tuareg unrest". BBC, via Temoust. 2007-09-07. Archived from the original on 2007-12-30. Retrieved 2007-10-08.
- ^ This Day: Nigerian Civil Aviation warns pilots, airlines of Harmattan haze
- ^ a b Valdmanis, Richard (2012-02-08). "Giant dust cloud chokes west Africa". Reuters. Retrieved 2012-02-09.
- ^ Terazono, Emiko and Blas, Javier (January 19, 2012). "Saharan wind stirs cocoa market". Financial Times. Retrieved January 28, 2012.
{{cite news}}: CS1 maint: multiple names: authors list (link)
- Ikekeonwu, Clara (2007). The phonetics of Nigerian languages. Munich: Lincom Europa. p. 62.
External links
- Chisholm, Hugh, ed. (1911). . Encyclopædia Britannica (11th ed.). Cambridge University Press.
- http://www.africawild.net/wild-facts/harmattan-the-west-african-winter
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