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Q.

What are anticyclones? How are they caused?

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Asked by always fresh, 28 Jan '10 12:01 pm
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Answers (2)

 
1.

An anticyclone (that is, opposite to a cyclone) is a weather phenomenon defined by the National Weather Service's glossary as "A large-scale circulation of winds around a central region of high atmospheric pressure, clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere". Effects of surface-based anticyclones include clearing skies as well as cooler, drier air. Fog can also form overnight within a region of higher pressure. Mid-tropospheric systems, such as the subtropical ridge, deflect tropical cyclones around their periphery and cause a temperature inversion inhibiting free convection near their center, building up surface-based haze under their base. Anticyclones aloft can form within warm core lows, such as tropical cyclones, due to descending cool air from the backside of upper troughs, such as polar highs, or from large scale sinking, such as the subtropical ridge. Anticyclonic flow spirals in a clockwise direction in the Northern Hemisphere and counte ...more
Answered by anupama kumar, 28 Jan '10 12:09 pm

 
  
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An anticyclone is opposite to a cyclone, in which winds move into a low-pressure area. In an anticyclone, winds move out from a high-pressure area with wind direction clockwise in the northern hemisphere, anti-clockwise in the southern hemisphere.
Such a high pressure area is usually spread over a large area, created by descending warm air devoid of moisture. The absence of moisture makes the dry air denser than an equal quantity of air with moisture. When it displaces the heavier nitrogen and oxygen, it causes an anti-cyclone.
source: http://timesofindia.indiatimes.com/home/sunday-toi/open-space/Wha t-are-anticyclones-How-are-they-caused/articleshow/5493723.cms
Answered by Somebodysomewhere, 28 Jan '10 12:08 pm

 
  
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