L08-Patterns-of-Radiation

L08-Patterns-of-Radiation - Natural Environments: The...

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Outline Further Reading: Chapter 04 of the text book - geographic patterns of energy balance - net radiation - meridional (latitudinal) transport Natural Environments: The Atmosphere GE 101 – Spring 2011 Boston University Myneni Lecture 08:Patterns of Radiation Feb-07-11 (1 of 12)
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Introduction Natural Environments: The Atmosphere GE 101 – Spring 2011 Boston University Myneni Lecture 08:Patterns of Radiation Feb-07-11 (2 of 12) Previously, we discussed the energy balance on a global scale and found that there are complex interactions between subsystems but that overall there is no net gain or loss of energy within any subsystem Has important implications: Global energy balance is the primary control on global climate The natural Greenhouse effect (i.e. absorption and re-emission of longwave radiation by the atmosphere) is the key to temperature control of the entire system The concept of thermal equilibrium suggest that the system establishes an energy balance by adjusting the temperature of the system If incoming energy is greater than outgoing energy, then the temperature increases, increasing the outgoing radiation This is the key to understanding the global warming debate : if humans add CO2, the Greenhouse effect increases, more re-radiated energy reaches the surface, hence incoming radiation increases, thus the temperature increases, increasing outgoing radiation until the system is balanced again
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Geographic Patters in the Radiation Balance Insolation(Incident solar radiation) Albedo(Reflected solar radiation divided by incident solar radiation) Reflected(Shortwave Radiation) Absorbed(Net Incoming) Shortwave Radiation Longwave(radiation) Net Radiation
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Insolation Natural Environments: The Atmosphere GE 101 – Spring 2011 Boston University Myneni Lecture 08:Patterns of Radiation Feb-07-11 (3 of 12) Today , we shall look at the geographic patterns in the radiation balance Insolation Albedo and Reflected Shortwave Radiation
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L08-Patterns-of-Radiation - Natural Environments: The...

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