Atmosphere: Molecular absorption

Molecular absorption databases tabulate the volume absorption coefficient of a gas mixture against the spectral coordinates, the volume fraction of the mixture components, air pressure and air temperature. Eradiate’s built-in molecular absorption datasets are managed by the data store (see Data guide introduction for details).

Format (monochromatic)

• Format xarray.Dataset (in-memory), NetCDF (storage)

• Dimensions

  • w: radiation wavelength

  • p: air pressure

  • t: air temperature

  • x_M, where M is the molecule formula, e.g. x_H2O: gas mixture mole fractions

• Coordinates (all dimension coordinates; when relevant, units are required and specified in the units metadata field)

  • w float [length]

  • p float [pressure]

  • t float [temperature]

  • x_M float [dimensionless]

• Data variables (when relevant, units are required and specified in the units metadata field)

  • sigma_a (w, p, t, x_M): volume absorption coefficient [length^-1]

Format (CKD)

• Format xarray.Dataset (in-memory), NetCDF (storage)

• Dimensions

  • w: bin central wavelength

  • wbv: bin bound (lower or upper)

  • g: cumulative probability of the absorption coefficient distribution

  • ng: number of quadrature points

  • p: air pressure

  • t: air temperature

  • x_M, where M is the molecule formula, e.g. x_H2O: gas mixture mole fractions

• Coordinates (all dimension coordinates; when relevant, units are required and specified in the units metadata field)

  • w float [length]

  • wbv str

  • g float [dimensionless]

  • ng int [dimensionless]

  • p float [pressure]

  • t float [temperature]

  • x_M float [dimensionless]

• Data variables (when relevant, units are required and specified in the units metadata field)

  • sigma_a (w, p, t, x_M): volume absorption coefficient [length^-1]

  • wbounds (w, wbv): bin bound values [length]

  • error (w, ng): relative error on transmittance when using the quadrature, optional [dimensionless]

Database index

gecko (mono)

Data store path

spectra/absorption/mono/gecko

Spectral sampling: 0.01 cm⁻¹ in [250, 300] + [600, 3125] nm, 0.1 cm⁻¹ in [300, 600] nm

komodo (mono)

Data store path

spectra/absorption/mono/komodo

Spectral sampling: 1 cm⁻¹

monotropa (CKD)

Data store path

spectra/absorption/ckd/monotropa

Spectral bin size: 100 cm⁻¹

mycena (CKD)

Data store path

spectra/absorption/ckd/mycena

Spectral bin size: 10 nm

panellus (CKD)

Data store path

spectra/absorption/ckd/panellus

Spectral bin size: 1 nm