from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An atmospheric area about 80 kilometers (50 miles) above the earth's surface, forming the upper boundary of the mesosphere.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. In the atmosphere, the boundary between the mesosphere and the ionosphere. It is the atmospheric boundary where the temperature reaches its minimum value.


Sorry, no etymologies found.


  • At the top of the mesosphere is another transition zone known as the mesopause.

    Atmosphere layers

  • What is the volume of air in a 5×5 degree grid (say 0-5 lat 0-5 long) that goes up ~80 km (guessing the below stops around the mesopause boundry and doesn’t count all the way the full 10,000)

    Water Vapor Feedback « Climate Audit


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