MUSICA IASI / TROPOMI RemoTeC fused CH4 data set (version 4.1)

This version 4.1 MUSICA IASI / RemoTeC TROPOMI fused methane data set contains total (ground – top of atmosphere, variable <xch4>), tropospheric (ground – 50% ground pressure, variable <troxch4>), and UTS (upper tropospheric/ stratospheric, 50% ground pressure – top of atmosphere, variable <utsxch4>) column-averaged dry-air mole fractions of methane (CH4). The data are obtained by combining the level 2 CH4 profiles and XCH4 total columns (generated from the IASI TIR spectra and the TROPOMI NIR/SWIR spectra, respectively).

The level 2 CH4 profiles were generated by the MUSICA processor (version 3.2 and 3.3, Schneider et al., 2022, doi.org/10.5194/essd-14-709-2022) and the level 2 XCH4 total columns by the RemoTeC processor (internal SRON version 19/0446, Lorente et al. 2022, doi.org/10.5194/amt-16-1597-2023). The combination is realized by means of a Kalman filter that uses the MUSICA IASI data as the background and the TROPOMI data as the new observation.