epygram.profiles — Functions on vertical profiles

This module contains functions to:

• to convert vertical coordinates systems from the one to another;
• compute air specific gas constant R according to specific humidity and hydrometeors.
• to plot vertical profiles.

Conversion

epygram.profiles.hybridP2fluxpressure(A, B, Psurf)

Computes the pressure at flux levels defined by hybrid-pressure coefficients. Coefficients are assumed to define flux levels.

• A = table of A coefficients
• B = table of B coefficients
• Psurf = surface pressure in Pa.

A and B must not contain the first coefficient (A=B=0.)

Returns a table of pressure.

epygram.profiles.hybridP2masspressure(A, B, Psurf, vertical_mean)

Computes the pressure at mass levels defined by hybrid-pressure coefficients. Coefficients are assumed to define flux levels.

• A = table of A coefficients
• B = table of B coefficients
• Psurf = surface pressure in Pa.
• vertical_mean = kind of vertical averaging

A and B must not contain the first coefficient (A=B=0.)

Returns a table of pressure.

epygram.profiles.hybridH2fluxheight(A, B, Zsurf, conv2height=False)

Computes the altitude at flux levels defined by hybrid-height coefficients. Coefficients are assumed to define flux levels.

• A = table of A coefficients
• B = table of B coefficients
• Zsurf = surface altitude in m.
• conv2height True to compute height instead of altitude

A and B must include the underground level

Returns a table of altitudes.

epygram.profiles.hybridH2massheight(A, B, Zsurf, conv2height=False)

Computes the altitude at mass levels defined by hybrid-height coefficients. Coefficients are assumed to define flux levels.

• A = table of A coefficients
• B = table of B coefficients
• Zsurf = surface altitude in m.
• conv2height True to compute height instead of altitude

A and B must include the underground level

Returns a table of altitudes.

epygram.profiles.flux2masspressures(pi_tilde, vertical_mean, Ptop=0.0)

Converts pressures at flux levels to mass levels.

epygram.profiles.mass2fluxpressures(pi, vertical_mean, Ptop=0.0)

Converts pressures at mass levels to flux levels.

epygram.profiles.flux2massheights(H_tilde)

Converts altitudes at flux levels to mass levels.

epygram.profiles.mass2fluxheights(H)

Converts altitudes at mass levels to flux levels.

epygram.profiles.pressure2altitude(R, T, vertical_mean, pi=None, pi_tilde=None, Pdep=None, Phi_surf=None)

Converts a pressure profile to mass-levels altitude (= height above ground if Phi_surf == 0).

The pressure can be given at mass levels (pi) or flux levels (pi_tilde), or both (assuming they are consistent), with unit: Pa.

• R = table of R = specific gas constant (J/kg/K)
• T = table of Temperature (K)
• vertical_mean = kind of vertical averaging
• Pdep = table of Pressure departure: P-Pi, where P is the hydrostatic pressure and Pi the Non-Hydrostatic pressure (Pa).
  0. if Hydrostatic (default)
• Phi_surf = surface geopotential (J/kg)

epygram.profiles.hybridP2altitude(A, B, R, T, Psurf, vertical_mean, Pdep=None, Phi_surf=None, Ptop=0.0)

Computes the altitude of mass levels defined by hybrid-pressure coefficients. (= height above ground if Phi_surf == 0).

• A = table of A coefficients
• B = table of B coefficients
• Psurf = surface pressure in Pa.
• R = table of R = specific gas constant (J/kg/K)
• T = table of Temperature (K)
• vertical_mean = kind of vertical averaging
• Pdep = table of Pressure departure: P-Pi, where P is the hydrostatic pressure and Pi the Non-Hydrostatic pressure (Pa).
  0. if Hydrostatic (default)
• Phi_surf = surface geopotential (J/kg)

A and B must not contain the first coefficient (A=B=0.)