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Climate Principles and Heat Transport: Understanding Earth's Illumination

Learn how the earth's climate is influenced by the distribution of heat received from the sun, resulting in convective heat transport from the equator to the poles through air and oceans. Understand the relationship between atmospheric CO2 concentration changes and climate sensitivity parameters, and explore the fundamental principles behind climate modeling.

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Climate Principles and Heat Transport: Understanding Earth's Illumination

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  1. Some climate principles

  2. Illumination of the earth by the sun:1. More heat received at the equator than at the poles2. Solid earth receives more heat by radiation than it radiates backRESULT: CONVECTIVE HEAT TRANSPORT FROM EQUATOR TO POLES THROUGH AIR AND OCEANS

  3. To go from atmospheric CO2 concentration change to climate change, we need to know the climate sensitivity parameter, l. The common approach is: DTs = lDForDF/DTs = 1/l where DF is the ‘radiative forcing’ caused by the increased CO2 concentration. The value of DF can be calculated from the increase in CO2 concentration using the deBeers law. DTs is the change in the surface temperature of the earth We can solve for l by taking the first derivative of Boltzman’s Law F = t sTs4 or dF/dTs = 4F/Ts leading to a l value of 0.3 K/Wm-2. This approach is the most fundamental response function and uses zero climate feedbacks! Most climate modellers use 0.5 K/Wm-2, incorporating various positive and negative feedbacks.

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