New Approximate Equations for the Saturation Pressure of Water Vapor and for Humidity Parameters Used in Meteorology

摘要

Approximate equations for the saturation pressure of water vapor in the pure as a function of temperature, for the corresponding inverse functions, and for some real-gas correction factors, based on the Goff-Gratch formulation were developed because the Groff-Gratch formulation of the thermodynamic properties of moist air, used by the World Meteorological Organization (WMO) as a basis for the calculation of humidity parameters, is often too complicated for direct applications. These amplified equations are used to establish methods for calculating the most important humidity parameters, e.g. dew-point temperature, relative humidity, mixing ratio etc. These methods, consisting for the most part of simple formulae, are tailored for meteorological applications, without assuming perfect gases.