The Atmospheric Lapse Rate and Molar Density

By Andy May, Michael Connolly and Ronan Connolly

In this post, we will discuss the tropopause, atmospheric molar density and the lapse rate (the change in atmospheric temperature with altitude). The key points are:

  1. A change in the molar density versus pressure best-fit line is a change in the equation-of-state.
  2. The NOAA and WMO definitions of the tropopause are different and somewhat clumsy.
  3. Molar density plots are a better and more robust way to pick the tropopause.

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