Results 1 to 5 of 5

Thread: Earth's geothermal budget

  1. #1
    Join Date
    May 2004
    Posts
    1,455

    Earth's geothermal budget

    How much of the Earth's heat outflow is generated by:
    1) Radioactive decay
    2) Solar and lunar tides
    3) Shrinkage of the Earth's radius
    4) Migration of dense matter into the core
    5) Anything I haven't thought of?

  2. #2
    Join Date
    Apr 2011
    Location
    Norfolk UK and some of me is in Northern France
    Posts
    7,062
    Well you left out stored solar heat. Lord Kelvin famously calculated an age of a few thousand years from assumptions that ignored in particular radioactive decay.
    sicut vis videre esto
    When we realize that patterns don't exist in the universe, they are a template that we hold to the universe to make sense of it, it all makes a lot more sense.
    Originally Posted by Ken G

  3. #3
    Join Date
    Dec 2007
    Location
    Atlanta
    Posts
    5,899
    As mentioned in the other thread you started related to this subject, residual heat from formation accounts for about half.

  4. #4
    Join Date
    May 2005
    Posts
    7,704
    Quote Originally Posted by Tom Mazanec View Post
    How much of the Earth's heat outflow is generated by:
    1) Radioactive decay
    2) Solar and lunar tides
    3) Shrinkage of the Earth's radius
    4) Migration of dense matter into the core
    5) Anything I haven't thought of?
    6) growth of the inner core by cooling
    7) sunshine/cooling of crust
    8) volcanic activity
    9)

  5. #5
    Join Date
    Sep 2003
    Location
    The beautiful north coast (Ohio)
    Posts
    46,415
    First hit on Google of "Earth's geothermal budget"
    https://en.wikipedia.org/wiki/Earth's_internal_heat_budget
    The flow of heat from Earth's interior to the surface is estimated at 47 terawatts (TW)[1] and comes from two main sources in roughly equal amounts: the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, and the primordial heat left over from the formation of the Earth.[2]

    Earth's internal heat powers most geological processes[3] and drives plate tectonics.[2] Despite its geological significance, this heat energy coming from Earth's interior is actually only 0.03% of Earth's total energy budget at the surface, which is dominated by 173,000 TW of incoming solar radiation.[4] The insolation that eventually, after reflection, reaches the surface penetrates only several tens of centimeters on the daily cycle and only several tens of meters on the annual cycle. This renders solar radiation irrelevant for internal processes.[5]
    At night the stars put on a show for free (Carole King)

    All moderation in purple - The rules

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •