Arden Buck equation

The Arden Buck equations are a group of empirical correlations that relate the saturation vapor pressure to temperature for moist air. The curve fits have been optimized for more accuracy than the Goff–Gratch equation in the range −80 to 50 °C (−112 to 122 °F).^[1]

A set of several equations were developed, each of which is applicable in a different situation.

Formula

The equations suggested by Buck (1996) (which are modifications of the equations in Buck (1981)) are:

P_{\mathrm {s} }\left(T\right)=0.61121\exp \left(\left(18.678-{\frac {T}{234.5}}\right)\left({\frac {T}{257.14+T}}\right)\right)

, over liquid water,

T

> 0 °C

P_{\mathrm {s} }\left(T\right)=0.61115\exp \left(\left(23.036-{\frac {T}{333.7}}\right)\left({\frac {T}{279.82+T}}\right)\right)

, over ice,

T

< 0 °C

where:

$P s (T)$ is the saturation vapor pressure in kPa
$exp(x)$ is the exponential function
$T$ is the air temperature in degrees Celsius

Notes

↑ Buck 1981

References

Buck, A. L. (1981), "New equations for computing vapor pressure and enhancement factor", J. Appl. Meteorol., 20: 1527&ndash, 1532
Buck (1996), Buck Research CR-1A User's Manual, Appendix 1. (PDF)

External links

Web Page listing various vapor pressure equations (for below 0 °C)

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[Buck_1981-1] Buck 1981

Arden Buck equation

Formula

See also

Notes

References

External links