Complex transform#
Complex transforms: physics-based and observation-operator-specific transforms.
These transforms implement non-trivial physical or chemical mappings that sit
beyond the system infrastructure transforms (system/) and the basic
algebraic transforms (basic/).
Transform summary#
conc2ratioConverts individual isotopologue concentrations to isotopic ratios (e.g. δ¹³C, δD) expressed in per-mil (‰). Forward: concentrations → ratios. Adjoint: propagates ratio sensitivities back to individual isotopologue concentration sensitivities.
ratio2concThe inverse of
conc2ratio: converts isotopic ratios (in ‰) and a total concentration back to individual isotopologue concentrations. Handles an arbitrary number of isotopologues via a binary-tree expansion.moist2dryConverts moist-air mixing ratios to dry-air number concentrations (molecules cm⁻³) using the specific humidity field and the species molar mass.
isotopesLegacy two-isotopologue version of the
conc2ratio/ratio2concpair. Handles forward, adjoint, and obs-vector conversion (native2obsvect/obsvect2native) for a single isotopic signature.satellitesApplies satellite averaging kernels and vertical interpolation to convert gridded model concentrations to satellite-equivalent column or level observations. Supports a wide range of retrieval formulae (OMI, TROPOMI, MOPITT, GOSAT, IASI, OCO-2, …).
diagmetReplicates the historical CHIMERE
diagmet.f90script: processes raw ECMWF meteorological fields to produce the derived fields required by CHIMERE (altitudes, air density, boundary-layer height, turbulent diffusivity, convective fluxes, etc.). The adjoint is a no-op.
Available Complex transform#
The following transform of sub-type complex are implemented in pyCIF so far: