L06-Radiation-and-Temperature

L06-Radiation-and-Temperature - Natural Environments: The...

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Outline Further Reading: Chapter 04 of the text book - s temperature - insolation and climatic regimes - composition/evolution of the atmosphere Natural Environments: The Atmosphere GE 101 – Spring 2011 Boston University Myneni Lecture 06: Radiation and Temperature Feb-02-11 (1 of 15)
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Introduction Natural Environments: The Atmosphere GE 101 – Spring 2011 Boston University Myneni Lecture 06: Radiation and Temperature Feb-02-11 (2 of 15) Last time we discussed radiation and distinguished between solar (or shortwave) and terrestrial (or longwave) radiation In addition, we discussed how temperature affects the amount and wavelength of radiation Today we want to look at how radiation can affect the temperature of a body In particular, we want to: Discuss how radiation from the sun determines the temperature of the earth s surface based upon a very simple model for the global earth system Look at how solar radiation varies with latitude and time of year We are also going to use this lecture to introduce some basic concepts used in atmospheric sciences to describe the composition and state of the atmosphere
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Thermal Equilibrium Natural Environments: The Atmosphere GE 101 – Spring 2011 Boston University Myneni Lecture 06: Radiation and Temperature Feb-02-11 (3 of 15) Amount of energy absorbed equals the amount of energy released (or radiated away) If the input of energy exceeds the output, energy is added to the system and it will heat up If the input of energy is less than the output, energy is removed from the system and it will cool down Hence, thermal equilibrium implies that there is no net heating of the system Now, let us apply this concept to our climate system!
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Global Radiative Energy Balance Natural Environments: The Atmosphere GE 101 – Spring 2011 Boston University Myneni Lecture 06: Radiation and Temperature Feb-02-11 (4 of 15) The flux arriving at the top of the atmosphere is constant This constant input of energy goes to heating the earth Heating of the earth raises the temperature
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L06-Radiation-and-Temperature - Natural Environments: The...

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