Namespace met_utilities_mod¶

Namespace List > met_utilities_mod

Public Functions¶

Public Functions Documentation¶

function arrhenius_rate¶

Calculate Arrhenius rate constant.

real( fp ) function, public met_utilities_mod::arrhenius_rate (
    real( fp ), intent(in) a,
    real( fp ), intent(in) ea,
    real( fp ), intent(in) t
) 

Parameters:

• A Pre-exponential factor [units vary]
• Ea Activation energy [J/mol]
• T Temperature [K]

Returns:

Rate constant [units of A] SeinfeldPandis2016

function brunt_vaisala_frequency¶

Calculate Brunt–Väisälä frequency squared (N^2)

real( fp ) function, public met_utilities_mod::brunt_vaisala_frequency (
    real( fp ), intent(in) t0,
    real( fp ), intent(in) dtdz
) 

Parameters:

• T0 Reference temperature [K]
• dTdz Vertical temperature gradient [K/m]

Returns:

Brunt–Väisälä frequency squared [1/s^2] WallaceHobbs2006

function bulk_richardson_number¶

Calculate the bulk Richardson number.

real( fp ) function, public met_utilities_mod::bulk_richardson_number (
    real( fp ), intent(in) t0,
    real( fp ), intent(in) tz,
    real( fp ), intent(in) u,
    real( fp ), intent(in) z
) 

Parameters:

• T0 Surface temperature [K]
• Tz Temperature at height z [K]
• u Wind speed at height z [m/s]
• z Height above ground [m]

Returns:

Bulk Richardson number (dimensionless)

function cunningham_correction_factor¶

Calculate Cunningham correction factor.

real( fp ) function, public met_utilities_mod::cunningham_correction_factor (
    real( fp ), intent(in) dp,
    real( fp ), intent(in) lambda
) 

Parameters:

• dp Particle diameter [m]
• lambda Mean free path of air [m]

Returns:

Cunningham correction factor (dimensionless)

function dew_point¶

Calculate dew point temperature.

real( fp ) function, public met_utilities_mod::dew_point (
    real( fp ), intent(in) t,
    real( fp ), intent(in) rh
) 

Parameters:

• T Temperature [K]
• rh Relative humidity [0-1]

Returns:

Dew point temperature [K] Bolton1980

function dry_adiabatic_lapse_rate¶

Calculate dry adiabatic lapse rate.

real( fp ) function, public met_utilities_mod::dry_adiabatic_lapse_rate () 

Returns:

Dry adiabatic lapse rate [K/m]

function friction_velocity¶

Calculate friction velocity (u*)

real( fp ) function, public met_utilities_mod::friction_velocity (
    real( fp ), intent(in) tau,
    real( fp ), intent(in) rho
) 

Parameters:

• tau Surface shear stress [N/m^2]
• rho Air density [kg/m^3]

Returns:

Friction velocity [m/s]

function henrys_law_constant¶

Calculate Henry's Law constant (temperature dependent)

real( fp ) function, public met_utilities_mod::henrys_law_constant (
    real( fp ), intent(in) h0,
    real( fp ), intent(in) dh,
    real( fp ), intent(in) t,
    real( fp ), intent(in) t0
) 

Parameters:

• H0 Reference Henry's constant [mol/(m^3*Pa)]
• dH Enthalpy of solution [J/mol]
• T Temperature [K]
• T0 Reference temperature [K]

Returns:

Henry's Law constant at T [mol/(m^3*Pa)] Sander2015

function latent_heat_vaporization¶

Calculate latent heat of vaporization (temperature dependent)

real( fp ) function, public met_utilities_mod::latent_heat_vaporization (
    real( fp ), intent(in) t
) 

Parameters:

• T Temperature [K]

Returns:

Latent heat of vaporization [J/kg]

function mean_free_path_air¶

Calculate the mean free path of air molecules.

real( fp ) function, public met_utilities_mod::mean_free_path_air (
    real( fp ), intent(in) t,
    real( fp ), intent(in) p
) 

Parameters:

• T Temperature [K]
• p Pressure [Pa]

Returns:

Mean free path [m] SeinfeldPandis2016

function mixing_ratio¶

Calculate mixing ratio from specific humidity.

real( fp ) function, public met_utilities_mod::mixing_ratio (
    real( fp ), intent(in) q
) 

Parameters:

• q Specific humidity [kg/kg]

Returns:

Mixing ratio [kg/kg]

function monin_obukhov_length¶

Calculate the Monin-Obukhov length.

real( fp ) function, public met_utilities_mod::monin_obukhov_length (
    real( fp ), intent(in) ustar,
    real( fp ), intent(in) t0,
    real( fp ), intent(in) h,
    real( fp ), intent(in) rho
) 

Parameters:

• ustar Friction velocity [m/s]
• T0 Surface temperature [K]
• H Sensible heat flux [W/m^2]
• rho Air density [kg/m^3]

Returns:

Monin-Obukhov length [m]

function nuclear_decay¶

Calculate nuclear decay (first-order)

real( fp ) function, public met_utilities_mod::nuclear_decay (
    real( fp ), intent(in) n0,
    real( fp ), intent(in) lambda,
    real( fp ), intent(in) t
) 

Parameters:

• N0 Initial quantity
• lambda Decay constant [1/s]
• t Time [s]

Returns:

Remaining quantity after time t

function photolysis_rate_scaling¶

Scale photolysis rate for solar zenith angle.

real( fp ) function, public met_utilities_mod::photolysis_rate_scaling (
    real( fp ), intent(in) j0,
    real( fp ), intent(in) sza
) 

Parameters:

• J0 Base photolysis rate [1/s]
• sza Solar zenith angle [degrees]

Returns:

Scaled photolysis rate [1/s]

function potential_temperature¶

Calculate potential temperature (theta)

real( fp ) function, public met_utilities_mod::potential_temperature (
    real( fp ), intent(in) t,
    real( fp ), intent(in) p,
    real( fp ), intent(in) p0
) 

Parameters:

• T Temperature [K]
• p Pressure [Pa]
• p0 Surface pressure [Pa]

Returns:

Potential temperature [K] WallaceHobbs2006

function ppm_to_ugm3¶

Convert ppm to ug/m3.

real( fp ) function, public met_utilities_mod::ppm_to_ugm3 (
    real( fp ), intent(in) ppm,
    real( fp ), intent(in) m,
    real( fp ), intent(in) t,
    real( fp ), intent(in) p
) 

Parameters:

• ppm Concentration [ppm]
• M Molar mass [g/mol]
• T Temperature [K]
• p Pressure [Pa]

Returns:

Concentration [ug/m3]

function psi_h_businger¶

Businger-Dyer stability correction for heat.

real( fp ) function, public met_utilities_mod::psi_h_businger (
    real( fp ), intent(in) zeta
) 

Parameters:

• zeta z/L (dimensionless stability parameter)

Returns:

Psi_h (stability correction for heat)

function psi_m_businger¶

Businger-Dyer stability correction for momentum.

real( fp ) function, public met_utilities_mod::psi_m_businger (
    real( fp ), intent(in) zeta
) 

Parameters:

• zeta z/L (dimensionless stability parameter)

Returns:

Psi_m (stability correction for momentum)

function psychrometric_constant¶

Calculate the psychrometric constant.

real( fp ) function, public met_utilities_mod::psychrometric_constant (
    real( fp ), intent(in) p,
    real( fp ), intent(in) lv
) 

Parameters:

• p Pressure [Pa]
• Lv Latent heat of vaporization [J/kg]

Returns:

Psychrometric constant [Pa/K]

function relative_humidity¶

Calculate relative humidity.

real( fp ) function, public met_utilities_mod::relative_humidity (
    real( fp ), intent(in) t,
    real( fp ), intent(in) qv,
    real( fp ), intent(in) p
) 

Parameters:

• T Temperature [K]
• qv Water vapor mixing ratio [kg/kg]
• p Pressure [Pa]

Returns:

Relative humidity [0-1] WallaceHobbs2006

function saturation_mixing_ratio¶

Calculate saturation mixing ratio.

real( fp ) function, public met_utilities_mod::saturation_mixing_ratio (
    real( fp ), intent(in) p,
    real( fp ), intent(in) t
) 

Parameters:

• p Pressure [Pa]
• T Temperature [K]

Returns:

Saturation mixing ratio [kg/kg]

function saturation_vapor_pressure¶

Calculate saturation vapor pressure (Clausius-Clapeyron)

real( fp ) function, public met_utilities_mod::saturation_vapor_pressure (
    real( fp ), intent(in) t
) 

Parameters:

• T Temperature [K]

Returns:

Saturation vapor pressure [Pa] Bolton1980

function specific_humidity¶

Calculate specific humidity from mixing ratio.

real( fp ) function, public met_utilities_mod::specific_humidity (
    real( fp ), intent(in) r
) 

Parameters:

• r Mixing ratio [kg/kg]

Returns:

Specific humidity [kg/kg]

function stability_classification¶

Classify atmospheric stability based on Monin-Obukhov length.

integer function, public met_utilities_mod::stability_classification (
    real( fp ), intent(in) l
) 

Parameters:

• L Monin-Obukhov length [m]

Returns:

Stability class: -1 (unstable), 0 (neutral), 1 (stable)

function stokes_number¶

Calculate Stokes number from base state variables.

real( fp ) function, public met_utilities_mod::stokes_number (
    real( fp ), intent(in) rho_p,
    real( fp ), intent(in) d_p,
    real( fp ), intent(in) u,
    real( fp ), intent(in) mu,
    real( fp ), intent(in) l
) 

Parameters:

• rho_p Particle density [kg/m^3]
• d_p Particle diameter [m]
• U Characteristic velocity [m/s]
• mu Dynamic viscosity [kg/m/s]
• L Characteristic length scale [m]

Returns:

Stokes number (dimensionless)

function stokes_settling_velocity¶

Calculate Stokes settling velocity for a particle.

real( fp ) function, public met_utilities_mod::stokes_settling_velocity (
    real( fp ), intent(in) dp,
    real( fp ), intent(in) rho_p,
    real( fp ), intent(in) rho_a,
    real( fp ), intent(in) mu,
    real( fp ), intent(in) cc
) 

Parameters:

• dp Particle diameter [m]
• rho_p Particle density [kg/m3]
• rho_a Air density [kg/m3]
• mu Air dynamic viscosity [kg/m/s]
• Cc Cunningham correction factor

Returns:

Settling velocity [m/s]

function ugm3_to_ppm¶

Convert ug/m3 to ppm.

real( fp ) function, public met_utilities_mod::ugm3_to_ppm (
    real( fp ), intent(in) ugm3,
    real( fp ), intent(in) m,
    real( fp ), intent(in) t,
    real( fp ), intent(in) p
) 

Parameters:

• ugm3 Concentration [ug/m3]
• M Molar mass [g/mol]
• T Temperature [K]
• p Pressure [Pa]

Returns:

Concentration [ppm]

function virtual_temperature¶

Calculate virtual temperature.

real( fp ) function, public met_utilities_mod::virtual_temperature (
    real( fp ), intent(in) t,
    real( fp ), intent(in) qv
) 

Parameters:

• T Temperature [K]
• qv Water vapor mixing ratio [kg/kg]

Returns:

Virtual temperature [K] WallaceHobbs2006

function wind_profile_loglaw¶

Calculate wind speed at height z using the log-law.

real( fp ) function, public met_utilities_mod::wind_profile_loglaw (
    real( fp ), intent(in) ustar,
    real( fp ), intent(in) z,
    real( fp ), intent(in) z0
) 

Parameters:

• ustar Friction velocity [m/s]
• z Height above ground [m]
• z0 Surface roughness length [m]

Returns:

Wind speed at height z [m/s]

The documentation for this class was generated from the following file src/core/met_utilities_mod.F90