Constructing an inversion ensemble

After performing an inversion, you can use the IMI to create a low-cost ensemble of sensitivity inversions with different inversion parameters. This is because the Jacobian matrix computed in the first inversion can easily be reused.

See the Common configurations page for instructions on how to re-configure the IMI to use a pre-computed Jacobian. Then modify the values of PriorError, ObsError, and/or Gamma in the configuration file and re-run the inversion.

Note

Make sure to archive the final results of the original inversion (inversion_result.nc and gridded_posterior.nc) before running the sensitivity inversion. Those files will be overwritten.

If you want to run a sensitivity inversion with updated prior emission inventories, the pre-computed Jacobian needs to be scaled according to the differences between the original and updated inventories. Instructions for this to come.