Impact of scene-specific enhancement spectra on matched filter greenhouse gas retrievals from imaging spectroscopy

Matched filter (MF) techniques have been widely used for retrieval of greenhouse gas enhancements (enh.) from imaging spectroscopy datasets. While multiple algorithmic and refinements proposed, the target spectrum concentration enh. estimation has remained largely unaltered since introduction quantitative MF retrievals. The magnitude retrieved methane carbon dioxide enh., thereby integrated mass (IME) estimated flux point-source emitters, is heavily dependent on this spectrum. Current standard use molecular absorption coefficients to create unit spectra does not account by background concentrations gases, solar sensor geometry, or atmospheric water vapor absorption. We introduce geometric parameters into generation scene-specific (SS) provide that are compatible with all techniques. For plumes, IME resulting standard, generic varied -22 +28.7% compared SS spectra. Due differences in spectral shape between spectra, plume were linked surface characteristics addition parameters. producing -76.1 -48.1% Fluxes calculated these would vary same %s, assuming equivalent wind conditions. Methane most sensitive changes zenith angle ground elevation. can improve confidence retrievals estimates across collections scenes diverse