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Absorption Module Methods & Types ​

Downloading HITRAN Data ​

Use artifact("CO2"), artifact("H2O"), and related artifact names to resolve packaged HITRAN .par files. See HITRAN Data Management and the Library for the canonical artifact helpers.

Reading HITRAN Files ​

Use read_hitran to select molecule/isotopologue records and spectral windows from HITRAN .par files.

Defining Models with Cross-Section Parameters ​

Use make_hitran_model for line-by-line cross sections and make_interpolation_model for lookup-table interpolation workflows.

Computing Absorption Cross-Sections ​

Use absorption_cross_section(model, ν, pressure, temperature) to evaluate the selected line-shape or interpolation model on a wavenumber grid.

Types ​

Hitran Data Structure Type ​

vSmartMOM.Absorption.HitranTable Type
julia
struct HitranTable{FT}

A struct, which provides all HITRAN line parameters needed to compute absorption cross sections

See https://hitran.org/docs/definitions-and-units/ for details

Fields

  • mol: The molecular species identification (ID) number

  • iso: The isotopologue ID number

  • νᵢ: The wavenumber of the spectral line transition (cm-1) in vacuum

  • Sᵢ: The spectral line intensity (cm−1/(molecule·cm−2)) at Tref=296K

  • Aᵢ: The Einstein-A coefficient (s-1) of a transition

  • γ_air: The air-broadened half width at half maximum (HWHM) (cm−1/atm) at Tref=296K and reference pressure pref=1atm

  • γ_self: The self-broadened half width at half maximum (HWHM) (cm−1/atm) at Tref=296K and reference pressure pref=1atm

  • E″: The lower-state energy of the transition (cm-1)

  • n_air: The coefficient of the temperature dependence of the air-broadened half width

  • δ_air: The pressure shift (cm−1/atm) at Tref=296K and pref=1atm of the line position with respect to the vacuum transition wavenumber νij

  • global_upper_quanta: The electronic and vibrational quantum numbers and labels for the upper state of a transition

  • global_lower_quanta: The electronic and vibrational quantum numbers and labels for the lower state of a transition

  • local_upper_quanta: Rotational, hyperfine and other quantum numbers and labels for the upper state of a transition

  • local_lower_quanta: Rotational, hyperfine and other quantum numbers and labels for the lower state of a transition

  • ierr: Ordered list of indices corresponding to uncertainty estimates of transition parameters

  • iref: Ordered list of reference identifiers for transition parameters

  • line_mixing_flag: A flag indicating the presence of additional data and code relating to line-mixing

  • g′: The upper state degeneracy

  • g″: The lower state degeneracy

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Broadening Function Types ​

The primary broadening models are Doppler, Lorentz, and Voigt. The canonical docstrings are grouped in the Library.

Complex Error Function Types ​

vSmartMOM.Absorption.HumlicekErrorFunction Type

Humlicek only formulation for Complex Error Function

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vSmartMOM.Absorption.HumlicekWeidemann32VoigtErrorFunction Type

Mix of Humlicek and Weidemann (N=32) Error Function, suggested for Voigt function

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vSmartMOM.Absorption.HumlicekWeidemann32SDErrorFunction Type

Mix of Humlicek and Weidemann (N=32) Error Function, suggested for Speed Dependent Voigt function

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vSmartMOM.Absorption.CPF12ErrorFunction Type

Humlicek with a single rational approximation.

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vSmartMOM.Absorption.ErfcHumliErrorFunctionVoigt Type

Mix of Humplicek and erfc Special Function for Voigt

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vSmartMOM.Absorption.ErfcHumliErrorFunctionSD Type

Mix of Humplicek and erfc Special Function for Voigt

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vSmartMOM.Absorption.ErfcErrorFunction Type

erfc Special Function for Voigt

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Cross-Section Model Types ​

vSmartMOM.Absorption.HitranModel Type
julia
struct HitranModel{FT}

A struct which provides all model parameters needed for cross-section calculations using HITRAN data

Fields

  • hitran: Struct with hitran data

  • broadening: Broadening function (Doppler/Lorentz/Voigt)

  • wing_cutoff: Wing cutoff [cm-1]

  • vmr: VMR of gas itself [0-1]

  • CEF: Complex Error Function to Use

  • architecture: Computer Architecture on which Model is run

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vSmartMOM.Absorption.InterpolationModel Type
julia
struct InterpolationModel{FT}

A struct which provides all model parameters needed for cross-section calculations using an Interpolator

Fields

  • itp: The interpolator

  • mol: The molecular species identification (ID) number

  • iso: The isotopologue ID number

  • ν_grid: Wavelength grids

  • p_grid: Wavelength grids

  • t_grid: Wavelength grids

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