File : D4.12
Author : Jacob van Peet (VUA)
VUA has characterized S5P TROPOMI retrieved column averaged mixing ratio of methane (XCH4) for use in inversions. A key part of this characterization is to use the measurements in an inversion using the TM5 atmospheric transport model and 4DVAR data assimilation. In addition to an inversion using the TROPOMI operational product, an inversion with a bias correction applied to the measurements has been performed. The TROPOMI XCH4 measurements were also compared to independent TCCON measurements.
Figure 1 : Inversion-derived CH4 emission adjustments. Top left: prior emissions. The other panels show the difference between prior and posterior emission. Top right: inversion with surface measurements only, bottom left: inversion with TROPOMI measurements only, bottom right: inversion with bias correction applied to TROPOMI measurements
