What are katabatic and Anabatic winds?

Anabatic Winds are upslope winds driven by warmer surface temperatures on a mountain slope than the surrounding air column. Katabatic winds are downslope winds created when the mountain surface is colder than the surrounding air and creates a down slope wind.

What do you mean by Anabatic wind?

anabatic wind, also called upslope wind, local air current that blows up a hill or mountain slope facing the Sun. During the day, the Sun heats such a slope (and the air over it) faster than it does the adjacent atmosphere over a valley or a plain at the same altitude.

What are katabatic winds caused by?

Also known as fall winds, katabatic winds are usually caused by gravity pulling higher density air downslope to lower density air.

Where are katabatic winds?


Katabatic winds are most commonly found blowing out from the large and elevated ice sheets of Antarctica and Greenland. The buildup of high density cold air over the ice sheets and the elevation of the ice sheets brings into play enormous gravitational energy.

What are the two types of katabatic winds?

Warm, dry katabatic winds occur on the lee side of a mountain range situated in the path of a depression. Examples for these descending, adiabatically warmed katabatic winds are the Foehn winds. Cold and usually dry katabatic winds, like the Bora, result from the downslope gravity flow of cold, dense air.

What are upslope winds?

A wind directed up a slope, often used to describe winds produced by processes larger in scale than the slope.

How are Anabatic winds formed or created?

Anabatic winds are mainly created by ultraviolet solar radiation heating up the lower regions of an orographic area (i.e. valley walls). Due to its limited heat capacity, the surface heats the air immediately above it by conduction. As the air warms, its volume increases, and hence density and pressure decreases.

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What is katabatic wind class 11?

Katabatic wind: During the night, the slopes get cooled and the dense air descends into the valley as the mountain wind. The cool air, of the high plateaus and ice fields draining into the valley is called katabatic wind.

What force generates winds?

Three forces are the cause behind the generation of the wind — pressure gradient force, friction force, and Coriolis force.

What are katabatic winds quizlet?

Katabatic winds are. downslope winds that are much stronger than mountain breezes. A chinook wind can be enhanced when. clouds form on the mountains’s windward side (left side)

Are katabatic winds seasonal?

[10] Seasonal and spatial variations of katabatic winds are significant and persistent features of the MCM climate [Bromley, 1985; Clow et al., 1988], as well as most of the Antarctic continent.

Where are katabatic winds strongest?

Antarctic Katabatic Winds (2005)

Simply put, katabatic wind is cold dense air that pours down the ice slope to the sea, becoming denser and picking up speed as it goes. Antarctica produces the strongest and most enduring katabatic winds as it is the highest and coldest continent.

What are the 4 local winds?

The main types of local winds are sea breezes and land breezes, Anabatic and katabatic winds, and Foehn winds.

What are the 3 examples of local winds?

Below are some of the most common types of local winds.

  • Land and Sea-Breezes. Sea and land breezes occur due to the differing temperatures between the land and the sea. …
  • Monsoons. …
  • Mountain and Valley Breezes. …
  • Katabatic Wind. …
  • Chinook Winds. …
  • Santa Ana Winds. …
  • Desert Winds. …
  • The Chinook Wind.
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What is a hot wind called?

Sirocco. A sirocco is a hot desert wind that blows northward from the Sahara toward the Mediterranean coast of Europe. More broadly, it is used for any kind of hot, oppressive wind.

Is Loo a local wind?

The Loo is a strong, dry and hot afternoon wind from the west in the summer, blowing over the western Indo-Gangetic Plain region of North India and Pakistan.

Is monsoon A wind?

A monsoon is a seasonal change in the direction of the prevailing, or strongest, winds of a region. Monsoons cause wet and dry seasons throughout much of the tropics. Monsoons are most often associated with the Indian Ocean. Monsoons always blow from cold to warm regions.

Is Chinook a local wind?

Detailed Solution. Chinook is the warm and dry local wind blowing on the leeward side or eastern side of Rockies (Prairies). Chinook is more common in winter and early spring from Colorado to British Columbia in Canada. The winds after descending through eastern slopes of the Rockies have warmed adiabatically.

Which type of wind is monsoon?

A monsoon is a seasonal wind system that shifts its direction from summer to winter as the temperature differential changes between land and sea. Monsoons often bring torrential summerrains, such as on the Indian subcontinent where the summer monsoon delivers three-quarters of the country’s annual precipitation.

What causes monsoon winds?

The primary cause of monsoons is the difference between annual temperature trends over land and sea. The apparent position of the Sun with reference to the Earth oscillates from the Tropic of Cancer to the Tropic of Capricorn. Thus the low pressure region created by solar heating also changes latitude.

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What is the 2 types of monsoon?

The Monsoon winds are classified into southwest monsoon and Northeast Monsoon on the basis of the direction from where they blow.

Why are monsoons called periodic winds?

monsoon winds are called periodical winds because it blows seasonally.

What is periodic winds in geography?

Certain winds reverse their direction periodically with season and are called periodic winds. These winds blow at regular intervals or in regular cycles. They are winds that result from localised differences in pressure and temperature.

What are periodic winds give two examples?

Secondary Winds or Periodic Winds

  • These winds change their direction with change in season.
  • Monsoons are the best example of large-scale modification of the planetary wind system.
  • Other examples of periodic winds include land and sea breeze, mountain and valley breeze, cyclones and anticyclones, and air masses.

What is variable wind?

Variable Wind Same as Variable Wind Direction; a condition when. (1) the wind direction fluctuates by 60° or more during the 2-minute evaluation period and the wind speed is greater than 6 knots; or. (2) the direction is variable and the wind speed is less than 6 knots.

What does 9900 mean for winds aloft?

A winds aloft forecast of 2722, for example, would indicate 22 knots of wind from 270 degrees. 9900 means no specific direction (variable) and less than 5 knots (light). ( Pilot’s Handbook of Aeronautical Knowledge, page 12-14)

What are the examples of variable winds?

Two main variable winds are cyclones and anti cyclones.