Solar Radiation, Heat Balance and Temperature
Madhya Pradesh Board · Class 11 · Geography
Quick revision notes for Solar Radiation, Heat Balance and Temperature — Madhya Pradesh Board Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
1. Solar Radiation and Insolation
- Incoming solar radiation received by the earth is called insolation.
- The earth receives almost all its energy from the sun.
- On an average, the earth receives 1.94 calories per sq. cm per minute at the top of its atmosphere.
2. Heating and Cooling of the Atmosphere
- The earth heated by insolation transmits heat to the atmospheric layers near the surface in long wave form.
- Conduction heats the air in contact with the land and the lower layers in contact with that air.
- Convection is the vertical heating of the atmosphere as heated air rises in currents.
3. Heat Budget of the Earth
- The earth as a whole does not accumulate or lose heat; it maintains its temperature.
- This balance is called the heat budget or heat balance of the earth.
- If 100 units of insolation are received at the top of the atmosphere, 35 units are reflected back to space before reaching the surface.
4. Temperature and Its Distribution
- Heat and temperature are not the same: heat is the molecular movement of particles, while temperature is the measurement of how hot or cold a place is.
- Temperature of air at any place is influenced by latitude, altitude, distance from the sea, air-mass circulation, warm and cold ocean currents, and local aspects.
- Places near sea level are warmer than places at higher elevations because the atmosphere is heated from below.
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