aiRthermoConstants {aiRthermo} | R Documentation |

##
Thermodynamical Constansts

### Description

Frecuently used constants in atmospheric thermodynamics and in this package.

### Usage

data(aiRthermoConstants)

### Format

*aiRthermoConstants* is a vector that includes the constants used by many of the functions in package.

### 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}*).

The values of the 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

#Define the Rd
data(aiRthermoConstants)
Rd <- aiRthermoConstants['Rd']
#Define gravity
data(aiRthermoConstants)
g <- aiRthermoConstants['g']

[Package

*aiRthermo* version 1.2.1

Index]