LATEST

    LDC EXAM PREPARATION    ||         SI / BDO EXAM PREPARATION 2020    ||        PREVIOUS QUESTIONS 2020 DEGREE LEVEL     ||        PREVIOUS QUESTIONS LDC     PSC EXAM PROGRAMME 2020     ||        TODAY'S EXAM RESULTS 2020    ||        FINAL ANSWER KEY    ||    FREE STUDY MATERIALS (LDC)     ||    FREE STUDY MATERIALS (DEGREE LEVEL)     ||    CURRENT AFFAIRS-MALAYALAM 2020     ||    CURRENT AFFAIRS-ENGLISH 2020

Tuesday, 28 July 2020

Global pressure belts

Global pressure belts

Pressure
If the pressure in a region is more than that of its surroundings, then we say that it is high pressure there and if it is less, we say that it is low pressure.
Global pressure belts
Generally, the earth experiences the same atmospheric pressure between certain
latitudes. These latitudinal zones are called global pressure belts.

Differences in the amount of solar radiation experienced over different parts of the earth cause the formation of different pressure belts. 
Following are the different pressure belts of the earth.

1. Equatorial low-pressure belt
2. Subtropical high-pressure belt (Northern Hemisphere)
3. Subpolar low-pressure belt (Northern Hemisphere)
4. Polar high-pressure belt (Northern Hemisphere)
5. Subtropical high-pressure belt (Southern Hemisphere)
6. Subpolar low-pressure belt (Southern Hemisphere)
7. Polar high-pressure belt (Southern Hemisphere)
Equatorial low-pressure belt
This pressure belt extends up to about 5° to 10° on either side of the equator. Here the high temperature is experienced throughout the year. Haven't you understood that as the temperature rises pressure decreases? It means that as a result of the higher temperature here the air expands and rises vertically. This is the reason for the formation of low pressure in this region. This low-pressure region characterised by a low horizontal movement of air is called doldrums. 
This pressure belt is also known as 'doldrum', meaning 'the zone with no winds'. The region was a nightmare for the ancient mariners.
Subtropical high-pressure belts
Subtropical high-pressure belts extend approximately over 30° north and south
latitudes. High-pressure belts develop over here as the hot air that rises up from the equatorial regions gets deflected due to the Coriolis effect and concentrates in these regions.
Horse latitude
Superior breeds of horses were once a major export from Europe to America and Cargo ships were used to carry them across. As the winds are feeble in the subtropical regions, it was difficult for these ships to sail smoothly. In order to make the ship lighter to facilitate easy voyage, they used to throw many of these horses into the sea. Thus the zone acquired the name ‘horse latitude’.
Subpolar low-pressure belts
Subpolar low-pressure belts extend approximately over 60° north and south
latitudes. These are regions where low temperature is experienced. As a result of the strong Coriolis effect in this region winds blowing from the polar regions are deflected away. Hence this exists as a low-pressure region.
Polar high-pressure belts
Since the temperature received in this region is the lowest, the air would be cooler. Cold air exerts a high pressure here. Along with this, the air deflected from the subtropical belt is concentrated here. This is the reason why polar regions have developed into high-pressure belts.
<ഈ ബ്ലോഗിലെ മുഴുവന്‍ പോസ്റ്റുകളും ഒരുമിച്ച് കാണുക>
PSC Solved Question Papers ---> Click here 
PSC TODAY's EXAM RESULTS ---> Click here
PSC EXAM PROGRAMME -> Click here
CURRENT AFFAIRS QUESTIONS -> Click here
PSC Degree Level Questions & Answers - Click here
PSC LDC/LGS Questions & Answers - Click here
PSC RANK LISTS / SHORTLISTS -> Click here
PDF BOOKS - Click here
TEACHING APTITUDE TEST (K-TET, C-TET,, etc.) ---> Click here
* SCERT KERALA TEXTBOOKS FOR CLASS II, IV, VI, VIII, IX, X, XII – FREE DOWNLOAD ---> Click here
* NCERT & CBSE TEXTBOOKS FOR ALL CLASSES – FREE DOWNLOAD ---> Click here
* NCERT & CBSE TEXTBOOKS SOLUTIONS FOR ALL CLASSES ---> Click here
Loading...

No comments:

Post a comment