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Building_Radiative_Balance

Building_Radiative_Balance. Richard B. Rood rbrood@umich.edu January 21, 2008. But the Earth’s surface temperature is observed to be, on average, about 15 C (~59 F). The sun-earth system (What is the balance at the surface of Earth?). SUN.

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Building_Radiative_Balance

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  1. Building_Radiative_Balance Richard B. Rood rbrood@umich.edu January 21, 2008

  2. But the Earth’s surface temperature is observed to be, on average, about 15 C (~59 F). The sun-earth system(What is the balance at the surface of Earth?) SUN Based on conservation of energy: If the Earth did NOT have an atmosphere, then, the temperature at the surface of the Earth would be about -18 C ( ~ 0 F). Welcome Back Radiative Balance. This is conservation of energy, which is present in electromagnetic radiation. Earth

  3. Energy is coming from the sun. Two things can happen at the surface. In can be: Reflected Or Absorbed Building the Radiative Balance What happens to the energy coming from the Sun? Top of Atmosphere / Edge of Space

  4. Reflect or Absorb Building the Radiative Balance What happens to the energy coming from the Sun? Top of Atmosphere / Edge of Space We also have the atmosphere. Like the surface, the atmosphere can:

  5. Reflect a lot Absorb some Building the Radiative Balance What happens to the energy coming from the Sun? Top of Atmosphere / Edge of Space In the atmosphere, there are clouds which :

  6. Building the Radiative Balance What happens to the energy coming from the Sun? RS Top of Atmosphere / Edge of Space For convenience “hide” the sunbeam and reflected solar over in “RS”

  7. Building the Radiative Balance What happens to the energy coming from the Sun? RS Top of Atmosphere / Edge of Space Consider only the energy that has been absorbed. What happens to it?

  8. Building the Radiative Balance Conversion to terrestrial thermal energy. RS Top of Atmosphere / Edge of Space 1)It is converted from solar radiative energy to terrestrial thermal energy. (Like a transfer between accounts)

  9. Building the Radiative Balance Redistribution by atmosphere, ocean, etc. RS Top of Atmosphere / Edge of Space 2)It is redistributed by the atmosphere, ocean, land, ice, life. (Another transfer between accounts)

  10. It takes heat to • Turn ice to water • And water to “steam;” • that is, vapor RADIATIVE ENERGY (infrared) PHASE TRANSITION OF WATER (LATENT HEAT) WARM AIR (THERMALS) Building the Radiative Balance Terrestrial energy is converted/partitioned into three sorts RS Top of Atmosphere / Edge of Space 3) Terrestrial energy ends up in three reservoirs (Yet another transfer ) CLOUD ATMOSPHERE SURFACE

  11. Building the Radiative Balance Which is transmitted from surface to atmosphere RS Top of Atmosphere / Edge of Space 3) Terrestrial energy ends up in three reservoirs CLOUD CLOUD ATMOSPHERE (LATENT HEAT) (THERMALS) (infrared) SURFACE

  12. 1) Some goes straight to space 4) Some is absorbed by clouds and atmosphere and re-emitted upwards 2) Some is absorbed by atmosphere and re-emitted downwards 3) Some is absorbed by clouds and re-emitted downwards Building the Radiative Balance And then the infrared radiation gets complicated RS Top of Atmosphere / Edge of Space CLOUD CLOUD ATMOSPHERE (LATENT HEAT) (THERMALS) (infrared) SURFACE

  13. Put it all together and this what you have got.The radiative balance

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