Double-check cmflq (total_water_flux_due_to_shallow_convection) standard name

[jimmielin]

This issue arose during the review for Hack shallow convection CCPPization #195

@nusbaume wrote about the cmflq standard name:

Is this actually "total" water, or just water vapor and cloud liquid water? Technically cloud ice would be included in total_water but I don't think anything is actually done with ice within the hack scheme outside of the general constituent tendencies.

@jimmielin wrote:

I am not too sure about this. Some parts of the code explicitly state cloud liquid water, so maybe "total water" is intentional, but you are also correct that nothing is done with cloud ice except from convective transport. The units for cmflq are also W m-2 which is unusual so I am not sure if we want to revise the standard name.

Current definition

[ cmflq ]
  standard_name = total_water_flux_due_to_shallow_convection
  units = W m-2
  type = real | kind = kind_phys
  dimensions = (horizontal_loop_extent, vertical_interface_dimension)
  intent = out

defined as

        ! The following variables have units of w/m**2
        cmfsl (i,k+1) = cmfsl (i,k+1) + fslkp*adjfac
        cmfsl (i,k  ) = cmfsl (i,k  ) + fslkm*adjfac
        cmflq (i,k+1) = cmflq (i,k+1) + hlat*fqlkp*adjfac
        cmflq (i,k  ) = cmflq (i,k  ) + hlat*fqlkm*adjfac

Tagging @nusbaume and @adamrher for future discussion.

Thanks!

[adamrher]

We had a similar issue with clubb's "total water" as clubb also neglects ice from its definition. We decided to be explicit on the definition in creating these standard names, e.g., pbuf_RTM (line 237 in CCPP standard name spreadsheet) is sum_of_water_vapor_and_cloud_liquid_mixing_ratio_wrt_dry_air.

We could similarly call cmflq sum_of_water_vapor_and_cloud_liquid_flux_due_to_shallow_convection.