Energy Input and Output on Earth

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Concept 5 - Matter and Energy

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Key Questions

  • These are approximations but from NASA,
    340 #W#/#m^2# is received by Earth 100 #W#/#m^2# is reflected by the clouds and ground collectively so about 240 #W#/#m^2# is absorbed into either the ground or the atmosphere.

    The Earth emits around 400 #W#/#m^2#, to which 340 #W#/#m^2# is reflected back through greenhouse gases, the rest escaped through radiation. The clouds emit around 30 #W#/#m^2#, the atmosphere emits around 170 #W#/#m^2# and there is an atmospheric window which emits 40 #W#/#m^2#.

    These figures were generated using average over a ten year period.

    Hope this is useful.

  • Answer:

    I expect you mean absorbed energy from outside sources on one hand and internal generated energy on the other

    Explanation:

    The vast quantity of energy absorbed by the Earth from outside sources comes from the Sun in the form of light and radiating heath.
    Obviously, any star that you see in the sky also contributes to the total. If the light reaches you, so does that minuscule quantity of energy.

    There are also all sorts of "cosmic rays" bombarding our planet. Some you can see if you live or visit high latitude countries in the form of "borealis" or Northern lights. Some, as neutrinos, are invisible to the most powerful telescopes.

    As for the output of energy, the globe we live on is still alive because of its ability of generating heath. The magma inside the Earth is scorching hot and flowing. This is mostly from radioactive minerals buried deep in the core of the Earth. This heath comes to the surface through volcanoes and other tectonic manifestations and, whatever energy is not exhausted in earthquakes and eruptions, is radiated out to the atmosphere.

    I hope I got your question right.

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