f.e21.FWscHIST.ne30_L48_BL10_cam6_3_035.tphysac_reorder_zm2_revert_parcelT.001.hf2

[cecilehannay]

Description: Same as f.e21.FWscHIST.ne30_L48_BL10_cam6_3_035.tphysac_reorder.001.hf2

The namelist uses _zmconv_parcelpbl = .false. and then we revert the parcelT in the code _zmconv.F90 instead of using _zmconv_parcelpbl = .true.

Case directory: Locally (if still available): /glade/p/cesmdata/cseg/runs/cesm2_0/f.e21.FWscHIST.ne30_L48_BL10_cam6_3_035.tphysac_reorder_zm2_revert_parcelT.001.hf2

On github https://github.com/NCAR/amwg_dev/tree/f.e21.FWscHIST.ne30_L48_BL10_cam6_3_035.tphysac_reorder_zm2_revert_parcelT.001.hf2

Sandbox: Locally (if still available): /glade/work/hannay/cesm_tags/cam6_3_035.tphysac

On github https://github.com/NCAR/amwg_dev/tree/cam6_3_035.tphysac/ hash: 148296dc

Diagnostics: AMWG diags (if available) https://webext.cgd.ucar.edu/FWscHIST/f.e21.FWscHIST.ne30_L48_BL10_cam6_3_035.tphysac_reorder_zm2_revert_parcelT.001.hf2/atm/

Contacts: @swrneale @cecilehannay

[adamrher]

is this supposed to be identical to L58+zm1? Or is it supposed to reproduce zm2 in the "cam6_3_019" runs? (In that version of zm2, the parcel properties are taken as the state at 0.5*PBL level, I believe).

[cecilehannay]

@swrneale: could you answer Adam's question?

[swrneale]

This was meant to revert the ZM initial parcel temperature calculation (back to T(mz(i))) rather than from MSE to see if it was the sole explainer of the large increase in humidity we saw in #28 (I think). It will not have the bug fixes from PR490, but that should only matter over steep orography anyway. The holidays have fuzzed my Brain so I hope I have this right! Rich

[adamrher]

That is my understanding as well, that we wanted to figure out why the "035" code base is more moist than the "019" code. I had thought that reverting the trapezoidal rule back via https://github.com/NCAR/amwg_dev/issues/28 would explain the differences, but it does not. So we opined that it was the difference between ZM2 in "019" compared to ZM2 in "035".

The expt in this thread seems to just turn off the parcel mods altogether, and so it is a ZM1 run. It doesn't shed light on the differences between the ZM2 in "019" compared to "035". It would be useful to replicate the ZM2 mods from "019", in "035". However, I'm happy with not pursuing this further; the "019" mods never made it to the trunk; the "035" solution is the vetted ZM2 solution.

[swrneale]

It was not the intention to turn off the parcel mods code, my mistake in communicating to @cecilehannay if that was the case. It was to just back off the parcel calculation bit of the zm2 mods to the 019 configuration.