Heat Budget of the Earth

By meenakshi|Updated : December 21st, 2022

The heat budget of the Earth is an ideal balance of the head radiation absorbed by the earth and the heat radiation emanating from the earth's atmosphere. It is calculated by the heat balance equation and is expressed as gram calories of heat per centimetre square of the lake surface. In this article, let us take a look at the heat budget of the earth and its significance.

What is Heat Budget of the Earth?

The heat budget of the atmosphere is the amount of heat that is required to raise the temperature of the water lakes to a maximum level in the summers. The heat budget of the atmosphere is a combination of the-

  • 34% of radiations from the outgoing long-wave terrestrial, 
  • 48% of the solar radiation, and 
  • 14% of the radiations emerging from the shortwaves that enter the solar radiations.

About 30% of all solar energy that reaches Earth is reflected back into space by Earth's atmosphere, clouds, and surface. The other 23% of energy is absorbed by water vapour, clouds, and dust in the atmosphere, which is converted into heat.

Solar radiation is assimilated by ocean and land, and the Earth's surface gets heated with this energy. The atmosphere receives energy absorbed by the Earth through three processes: radiation, conduction, and latent heat.

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FAQs on Heat Budget of the Earth

  • Heat budget is the equilibrium between the isolating radiations and the terrestrial radiations. In simpler words, the heat budget is an ideal balance of the head radiations absorbed by the earth and the heat radiation escaping from the earth’s atmosphere.

  • The heat balance and the heat budget can be the same only if the amount of heat received (isolation) is equal to the amount of heat lost (terrestrial radiation). If the balance is disturbed, the earth will either get cooler or warmer as time passes. Hence, the heat budget is only the loss and gain of heat on earth.

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