Add config_dt for 60km to 3.75km oQU grids

[gdicker1]

This is an attempt to use the namelist files to select the config_dt for mpas-si instead of doing it in an user_nl_mpassi file or by shell commands.

Important context for these values: EarthWorksOrg/EarthWorks#45 (comment)

[gdicker1]

@dazlich, I'm not certain of these values but thought they would be a good "first stab" at the settings. Let me know what you think!

[dazlich]

Are these the values that have been used with QPC6? I think QPC6 jets may not be quite so strong as we will get in an F-case or fully-coupled. We may need have different sets for different cases. I know my 30km F simulations require shorter than 450s - I've been using 240s, not sure we can get away with 300s.

[dazlich]

Let's find out what Brian Dobbins is using for the 3.75km DYAMOND case and work up from there.

[dazlich]

oops, these are for the ice (and ocean presumably, too). I should've looked more closely.

These should be 2*mpas_dt, which should also be the coupling interval/cam physics timestep. Do we have defaults set for mpas_dt?

[dazlich]

Just heard from Brian Dobbins about what he is doing - In QPC6 at 3.75km he is using mpas_dt = 20s and a coupling frequency of 60s - this matches config_dt=60. which you suggested. The coarser resolutions match up with reasonable mpas_dt*3. So it looks good to me.

Will you be doing the same for the mpas-ocean?

[gdicker1]

Just heard from Brian Dobbins about what he is doing - In QPC6 at 3.75km he is using mpas_dt = 20s and a coupling frequency of 60s - this matches config_dt=60. which you suggested. The coarser resolutions match up with reasonable mpas_dt*3. So it looks good to me.

Thanks for checking on this, I'm glad the first stab was right!

Will you be doing the same for the mpas-ocean?

It looks like we already have some in namelist_defaults_mpaso.xml L37-45. Do you think those are appropriate?

[dazlich]

Except for QU120, the defaults need to be changed for the ocean and set identical to the ones in seaice. On May 16, 2024, at 8:47 AM, G. Dylan Dickerson ***@***.***> wrote: ** Caution: EXTERNAL Sender ** Just heard from Brian Dobbins about what he is doing - In QPC6 at 3.75km he is using mpas_dt = 20s and a coupling frequency of 60s - this matches config_dt=60. which you suggested. The coarser resolutions match up with reasonable mpas_dt*3. So it looks good to me. Thanks for checking on this, I'm glad the first stab was right! Will you be doing the same for the mpas-ocean? It looks like we already have some in namelist_defaults_mpaso.xml L37-45<https://github.com/EarthWorksOrg/mpas-ocean/blob/b7d350ab51fad1b9a1bc6466176df6f23352f38f/bld/namelist_files/namelist_defaults_mpaso.xml#L37-L45>. Do you think those are appropriate? — Reply to this email directly, view it on GitHub<#11 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ADS3XWGNWZZFWUXXFPXCYJTZCTBHHAVCNFSM6AAAAABHYVC6W6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMJVGQ2TENBRG4>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[gdicker1]

Except for QU120, the defaults need to be changed for the ocean and set identical to the ones in seaice.

Understood, I'll get this PR merged and open a similar one in EWOrg/MPAS-O. I plan to include these as part of EWOrg/EW #45

[dazlich]

Great! On May 16, 2024, at 9:35 AM, G. Dylan Dickerson ***@***.***> wrote: ** Caution: EXTERNAL Sender ** Except for QU120, the defaults need to be changed for the ocean and set identical to the ones in seaice. Understood, I'll get this PR merged and open a similar one in EWOrg/MPAS-O. I plan to include these as part of EWOrg/EW #45<EarthWorksOrg/EarthWorks#45> — Reply to this email directly, view it on GitHub<#11 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ADS3XWCH2LXSUFNWEB4U5QLZCTG4JAVCNFSM6AAAAABHYVC6W6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCMJVGU3TCOJYGI>. You are receiving this because you were mentioned.Message ID: ***@***.***>