Add soil increments to deterministic member about global-workflow

[ClaraDraper-NOAA]

@aerorahul @WalterKolczynski-NOAA Do either of you know why we're calculating the ensemble mean increment using a purpose-designed executable, rather than using the option in the EnKF to output the ensemble mean increment? (asking, as I need to add calculation of the ensemble mean increment for the soil analysis, and am wondering if I can just use the EnKF output option).

[ClaraDraper-NOAA]

@aerorahul @WalterKolczynski-NOAA Do either of you know why we're calculating the ensemble mean increment using a purpose-designed executable, rather than using the option in the EnKF to output the ensemble mean increment? (asking, as I need to add calculation of the ensemble mean increment for the soil analysis, and am wondering if I can just use the EnKF output option).

I figured it out. The code to write out increments from within the enkf requires the background (for conversion to Tv, and things like that). The background mean file is not available. Also it's non-linear, so using the mean background to write out the mean increment wouldn't give the same answer as calculating the mean of the ensemble output increments.