Opened 7 years ago
Last modified 7 years ago
#479 new enhancement
Specify units for forward model gradients in ROPP FM UG
| Reported by: | Ian Culverwell | Owned by: | Ian Culverwell |
|---|---|---|---|
| Priority: | minor | Milestone: | Whenever |
| Component: | ropp_fm | Version: | 8.0 |
| Keywords: | Gradient | Cc: |
Description
Joe Nielsen (DMI) points out that the forward model gradient fields, generated when ropp_fm_bg2ro_1d is run without the -f option, are calculated in 'ropp_fm' units (eg N-unit/K, N-unit/(kg/kg), N-unit/Pa, rather than 'ropp_io' units (eg N-unit/K, N-unit/(g/kg), N-unit/hPa). With the log p/q option, or with (eg) Met Office background files, the units would be different again. And the unit conversion routines in ropp_utils couldn't cope with units literally given as 'N-unit/K, N-unit/(kg/kg), N-unit/Pa', for example. So we have to live with dN/dx having a unit in the output file of 'N-unit'.
The ROPP FM documentation doesn't spell this out, and probably should. Secs 4.8.6, 4.9.6 and E.3 would be good places to note it.
We could also say something in the header of ropp_fm_bg2ro_1d.f90, or in its help menu (activated by calling 'ropp_fm_bg2ro_1d -h'.)