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## Saturation Vapor Pressure

The article discusses the calculation of saturation vapor pressure (e_sat^T) and its derivative (de_sat^T/dT) as a function of temperature (T). The calculations are based on eighth-order polynomial fits from Flatau et al. (1992).

The equations for e_sat^T and de_sat^T/dT are provided, along with the corresponding coefficient tables for water and ice. The valid temperature ranges are:

- Ice: -75°C ≤ T < 0°C
- Water: 0°C ≤ T ≤ 100°C

The article also presents the equations for calculating the saturated water vapor specific humidity (q_sat^T) and its derivative (dq_sat^T/dT) using the saturation vapor pressure and its derivative.

The key points are the mathematical formulas and the tabulated coefficients used to compute the saturation vapor pressure and related humidity parameters as functions of temperature.