Atmospheric Circulation and Weather Systems — Revision Notes
CBSE · Class 11 · Geography
Atmospheric Circulation and Weather Systems revision notes for CBSE Class 11 Geography: 4 topics in quick points.
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Key Topics to Revise
Atmospheric Pressure and Its Variation
- Atmospheric pressure is the weight of a column of air from mean sea level to the top of the atmosphere per unit area.
- It is expressed in millibar.
- The average atmospheric pressure at sea level is 1,013.2 mb.
Forces Affecting Wind
- Wind is air in motion.
- Near the Earth's surface, wind is affected by pressure gradient force, frictional force, Coriolis force, and gravitational force acting downward.
- Pressure gradient force is produced by differences in atmospheric pressure.
Global Pressure Belts and General Circulation
- Near the equator, sea-level pressure is low and the area is called the equatorial low.
- Along 30° N and 30° S are the subtropical highs.
- Along 60° N and 60° S are the sub polar lows.
Air Masses and Fronts
- An air mass is a large body of air with little horizontal variation in temperature and moisture.
- It acquires the characteristics of the source region over which it forms.
- There are five major source regions for air masses.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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