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Saturday, 1 August 2020

Global Winds - Permanent winds

Permanent winds
Different types of winds blow on the earth's surface. They can be classified in the following manner:
• Planetary winds or permanent winds
• Periodic winds or seasonal winds
• Local winds
• Variable winds


Planetary winds or permanent winds
The winds developed between the global pressure belts can be generally called as planetary winds or permanent winds
The winds blowing approximately in the same direction between specific pressure belts permanently are called permanent winds. 
The different planetary winds are listed below. 
• Trade winds
• Westerlies
• Polar easterlies
Trade winds
Trade winds are winds blowing from the subtropical high-pressure belts to the equatorial low-pressure belts. These winds blow as the northeast winds in the northern hemisphere and the south-east winds in the southern hemisphere. The equatorial low-pressure zone where the trade winds from both the hemispheres converge is known as the Inter-Tropical Convergence Zone (ITCZ). 
These are winds which blow in the same direction with the same velocity throughout the year, especially in the oceanic regions.  
Trade winds which carry water vapour from the oceans cause rainfall in the eastern coasts of the continents. As it moves towards the west it loses water vapour and hence doesn't cause rainfall in the western coasts of the continents. 
Subtropical deserts are situated in the western parts of continents. During ancient times these winds helped travellers who sailed the seas for business in sailboats. Since they are steady winds blowing in the same direction they got the name Trade winds.
On the hands of wind…
In the past, the trade winds that blew in a constant direction throughout the year were a blessing to those transporting goods in ships and other vessels.
The name 'trade wind' might have evolved since it helped ocean trade quite a lot. The term 'traden' in German means 'winds that maintain constant direction'. 

Westerly winds
The winds blowing from the subtropical high-pressure belts towards the subpolar low-pressure belts are called the westerly winds. In the northern hemisphere, the westerly winds blow from the southwestern direction to the northeastern direction. But in the southern hemisphere, they blow from the northwestern direction to the southeastern direction.
Since they blow from the western direction, they are called the westerly winds.
In the southern hemisphere as we go southwards the westerly winds blow strongly.  This is due to the absence of big continents and the pressure of vast oceans.
The ancient mariners had given different names to the rough westerlies in the Southern Hemisphere, such as 'Roaring Forties' (along 40° latitudes), 'Furious Fifties' (along 50° latitudes) and 'Shrieking Sixties' (60° latitudes).

Polar winds
These are winds blowing from the polar high-pressure belts to the subpolar low-pressure belts. The polar winds are colder and stronger. These winds are also called easterly winds. These winds blow from the East in both the hemispheres due to the Coriolis Force. Hence these are known as polar
easterlies. These winds play a significant role in determining the climate of North America, the eastern European countries, and Russia.
📌Related Topics
👉 Atmospheric pressure and winds
👉 Weather and climate
👉 Global pressure belts
👉 Variations in atmospheric pressure
👉 The atmosphere 
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