Atmospheric Circulation and Weather Systems
Karnataka Board · Class 11 · Geography
Summary of Atmospheric Circulation and Weather Systems for Karnataka Board Class 11 Geography. Key concepts, important points, and chapter overview.
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Overview
This chapter explores how uneven heating of Earth's surface creates pressure differences that drive atmospheric circulation and weather patterns. Air expands when heated and compresses when cooled, leading to pressure variations that cause air movement from high to low pressure areas. This horizonta
Key Concepts
The weight of air column from
The weight of air column from mean sea level to the top of atmosphere, measured in millibars. At sea level, average atmospheric pressure is 1,013.2 mb
Three main forces control horizontal wind
Three main forces control horizontal wind movement: (1) Pressure Gradient Force - drives air from high to low pressure; (2) Coriolis Force - deflects
Earth has distinct pressure zones
Earth has distinct pressure zones: Equatorial Low (0°), Subtropical Highs (30°N and S), Subpolar Lows (60°N and S), and Polar Highs (90°N and S). Thes
Three
Three-cell circulation model: (1) Hadley Cell - warm air rises at equator, moves poleward, sinks at 30°; (2) Ferrel Cell - air rises at 60°, sinks at
Large bodies of air with uniform
Large bodies of air with uniform temperature and humidity characteristics acquired from source regions. Five types: Maritime Tropical (mT), Continenta
Learning Objectives
- Understand the relationship between temperature differences and atmospheric pressure variations
- Explain the forces that control atmospheric circulation including pressure gradient, Coriolis, and friction forces
- Describe the pattern of global wind systems and general atmospheric circulation
- Analyze the formation and characteristics of different air masses
- Understand the formation and behavior of weather fronts and their effects
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- 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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