export_constants: Export the constants

Description

This function exports to R the constants frecuently used in the C part of aiRthermo for consistency.

Usage

export_constants()

Arguments

Details

The constants stored in the vector are (in SI units): the gas constant for dry air \(R_d\) and for water vapour \(R_v\) (\(\frac{J}{Kkg}\)), the temperature \(T_0\) corresponding to 0 degree Celsius, \(es_0\) used to calculate the saturated vapour pressure (Pa), 1000 hPa in Pa (P1000), the specific heat of dry air for constant pressure \(c_p\) (\(\frac{J}{Kkg}\)) and for constant volume \(c_v\) (\(\frac{J}{Kkg}\)), acceleration due to gravity at sea level g (\(\frac{m}{s^2}\)), our definition of a missing value MISSING_VALUE (-99999999) and epsilon \(\varepsilon\) (\(\frac{R_d}{R_v}\)).

Constants are taken from Bohren & Albrecht (1998), and they are also consistent with those used in Petty (2008), Erukhimova & North (2009) and Davies-Jones (2009).

References

Bohren, C.F., & Albrecht, B. A. (1998). Atmospheric thermodynamics. Atmospheric thermodynamics. Publisher: New York; Oxford: Oxford University Press, 1998. ISBN: 0195099044.

Petty, G.W. (2008). A First Course in Atmospheric Thermodynamics, Sundog Publishing, Madison.

North, G. R. , Erukhimova,T. L. (2009). Atmospheric Thermodynamics, Cambridge University Press, New York.

Davies-Jones, R. (2009). On formulas for equivalent potential temperature, Monthly Weather Review, 137,3137-3148. doi:10.1175/2009MWR2774.1.

Examples

Run this code

# NOT RUN {
aiRthermoConstants<-export_constants()
# }