Lecture 4&5 - Earth's Energy Balance The hydrologic...

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Earth’s Energy Balance The hydrologic cycle is fueled by energy from the sun. Planetary geometry creates areas of energy surpluses and deficits which drive all active meteorological processes. Earth and the atmosphere are the media through which the energy transport occurs Water transport and phase changes [i.e. liquid (oceans) vapor (humidity) liquid (precipitation)] play a major role energy transport
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Earth’s Energy Balance reflected from particulates in air, clouds and the earth’s surface - 30 % longwave radiation emanated - 70 % longwave radiation from clouds, vapor, etc. back radiation from earth - 20% earth heat entering atmosphere - 0.002 % (geothermal) absorbed by earth - 51% absorbed by atmosphere (water vapor, dust, clouds) - 19 %
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Earth’s Energy Balance Short-wave energy from the sun moves through the atmosphere to the earth more easily than longwave energy can move from earth through the atmosphere. This keeps the planet warm Planetary geometry creates areas of energy surpluses and deficits. Incoming solar radiation is uneven because the earth is a sphere which rotates on a tilted axis. Outgoing radiation is more uniform because the temperature of earth’s atmosphere does not vary all that much from the equator to the poles (~ 30 ° C). Energy gradients drive global energy transport processes such as wind and ocean currents.
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Earth’s Energy Balance Net radiation balance is positive for latitudes below 35 ° (receive more radiation than is emitted), and negative for latitudes above 35 ° . Therefore there is a net poleward transport of energy to maintain a
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Lecture 4&5 - Earth's Energy Balance The hydrologic...

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