AnyAdiabaticDown {aiRthermo} | R Documentation |
Calculation of the state of an air parcel subject to an adiabatic downwards evolution, taking into account the initial conditions of the parcel (Pstart, Tstart, wstart, wcstart).
AnyAdiabaticDown(Pstart, Tstart, wstart, wcstart, Pend, deltaP)
Pstart |
Initial pressure value (Pa). |
Tstart |
Initial temperature value (K). |
wstart |
Initial mixing ratio value (kg/kg). |
wcstart |
Initial mixing ratio value for the condensates (kg/kg). |
Pend |
Final pressure value (Pa). |
deltaP |
Pressure step used for the calculation. It must be a positive value (Pa). |
In this case, we start from a parcel at pressure pstart (Pa), temperature tstart (K) and mixing ratio wstart (kg/kg), with potentially some condensates wcstart (kg/kg). The latent heat (L) used during the evolution depends on the Temperature (T). It is computed as described by latent_heat_H2O
. As the parcel goes down it could evaporate the condensates or, if no condensates are available anymore, it will go down according to a dry adiabatic evolution by means of a dry adiabatic process until the level Pend. At this point, it will have a temperature Tend, mixing ratio (vapour) Wend and Wcend (may be still some condensates could be left) using steps of pressure dP (always positive).
This function returns a list including the following values:
Tend |
Temperature at the end (K). |
Wend |
Mixing ratio of water vapour at the end (kg/kg). |
Wcend |
Mixing ratio of condensed water at the end (kg/kg). |
AnyAdiabaticDown(50000,227,8.5e-5,0.005,101325,5) AnyAdiabaticDown(70000,237,4e-4,0.005,101325,5)