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pressure = antatm(elevation)

This function converts elevation $ z$ in meters to atmospheric pressure $ p$ in hPa using the pressure-elevation relationship:

$\displaystyle p(z) = 989.1 \exp{ \left[ \frac{-z}{7588} \right] }$ (25)

The pressure-elevation relationship is derived from:

Radok, U., Allison, I., and Wendler, G., 1996. Atmospheric pressure over the interior of Antarctica. Antarctic Science 8, pp. 209-217.

For further discussion see:

Stone, J., 2000. Air pressure and cosmogenic isotope production. Journal of Geophysical Research 106, pp. 23,753-23,759.