b.e30_beta04.BLT1850.ne30_t232_wgx3.121

[cecilehannay]

Purpose:
Same as 120 (#25) but 1) reverting to the opacity scheme back (for MOM) to what it was before beta04; 2) changing KPP_CVt2 = 1.6 -> 1.0, and 3) USE_BODNER23 = True -> False.

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Description:
Same as 120 (#25) except:

• user_nl_mom

MIN_SALINITY = 1.e-06
MAXTRUNC = 1000
GUST_CONST = 0.00004
CEMP_NL = 2.0

KPP%
KPP_CVt2 = 1.0
%KPP

OPACITY_SCHEME = "MANIZZA_05"
PEN_SW_NBANDS = 3

• SourceMods/src.mom

/glade/campaign/cesm/cesmdata/cseg/runs/cesm2_0/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/SourceMods/src.mom/cvmix_kpp.F90 

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Case directory:

• Locally (if still available):
  /glade/campaign/cesm/cesmdata/cseg/runs/cesm2_0/b.e30_beta04.BLT1850.ne30_t232_wgx3.121

• On github:
  https://github.com/NCAR/cesm_dev/tree/b.e30_beta04.BLT1850.ne30_t232_wgx3.121

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Sandbox:

• Locally (if still available): /glade/work/hannay/cesm_tags/cesm3_0_beta04

• On github: https://github.com/ESCOMP/cesm/tree/cesm3_0_beta04

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Diagnostics:

• Diags (if available):
  https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/

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Output:

• Raw output on derecho (if still available): /glade/derecho/scratch/hannay/archive/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/
• CAM Climos: /glade/campaign/cgd/amp/amwg/climo/b.e30_beta04.BLT1850.ne30_t232_wgx3.121

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Contacts:
@cecilehannay @dlawrenncar @adamrher @PeterHjortLauritzen @JulioTBacmeister @slevis-lmwg @wwieder @olyson @gustavo-marques

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Extra details:

[jedwards4b]

Note that in the initial comment the SourceMods directory is incorrect. It should be:
/glade/campaign/cesm/cesmdata/cseg/runs/cesm2_0/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/SourceMods/src.mom/cvmix_kpp.F90

I have mirrored this case in /glade/derecho/scratch/jedwards/b.e30.BLT1850.ne30_t232_wgx3.121 using a new software stack:

Currently Loaded Modules:
  1) cesmdev/1.0   (H,S)   3) craype/2.7.31    5) mkl/2025.0.1          7) cmake/3.26.6         9) cray-mpich/8.1.29  11) netcdf-mpi/4.9.2        13) parallelio/2.6.3
  2) ncarenv/24.12 (S)     4) intel/2025.0.3   6) ncarcompilers/1.0.0   8) libfabric/1.15.2.0  10) hdf5-mpi/1.12.3    12) parallel-netcdf/1.14.0  14) esmf/8.7.0

The most significant change in this stack is from the deprecated intel ifort compiler to it's replacement ifx. Since we do not currently have an ECT test for CESM3, I would like someone to compare outputs between this run and the one in my directory.

[gustavo-marques]

We resolved the significant biases in mixed layer depths in tropical regions. We are getting similar results to what we had in #112.

The following plots are averages between years 10 and 15.

Winter

Summer

[cecilehannay]

This run completed 20 years. The ocean looks promising and Gustavo would like to extend the run further.

Before extending, I want to make sure there are no showstopper. I added the ADF for review at: https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/atm/
In the ADF, RESTOM appears sufficiently balanced to extend the run.
Please have a look at the run and share your thoughts.

[gustavo-marques]

Here are the ocean diagnostics:
https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/ocn/

There are no showstoppers in the ocean.

[olyson]

Here are the land diagnostics:

https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/lnd/b.e30_beta04.BLT1850.ne30_t232_wgx3.121_11_20-b.e30_beta04.BLT1850.ne30_t232_wgx3.120_11_20/setsIndex.html

I don't see any showstoppers, but I will let @wwieder and @slevis-lmwg weigh in also.
Some beneficial increases in TLAI across the tropics. In particular, the Amazon has increases in TLAI, photosynthesis, and latent heat flux, with cooler temperatures. Increases in precipitation in the dry season.

[dlawrenncar]

Seems like we should extend this run. Promising.

…

On Sat, Dec 28, 2024 at 4:06 PM Keith Oleson ***@***.***> wrote: Here are the land diagnostics: https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/lnd/b.e30_beta04.BLT1850.ne30_t232_wgx3.121_11_20-b.e30_beta04.BLT1850.ne30_t232_wgx3.120_11_20/setsIndex.html I don't see any showstoppers, but I will let @wwieder <https://github.com/wwieder> and @slevis-lmwg <https://github.com/slevis-lmwg> weigh in also. Some beneficial increases in TLAI <https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/lnd/b.e30_beta04.BLT1850.ne30_t232_wgx3.121_11_20-b.e30_beta04.BLT1850.ne30_t232_wgx3.120_11_20/set2/set2_ANN_TLAI.gif> across the tropics. In particular, the Amazon <https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/lnd/b.e30_beta04.BLT1850.ne30_t232_wgx3.121_11_20-b.e30_beta04.BLT1850.ne30_t232_wgx3.120_11_20/set3/set3_landf_Amazonia.gif> has increases in TLAI, photosynthesis, and latent heat flux, with cooler temperatures. Increases in precipitation in the dry season. — Reply to this email directly, view it on GitHub <#32 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFABYVCVJZF6IPV5IZGDRDL2H4VIRAVCNFSM6AAAAABUFJJVW2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDKNRUGU2TENJYGY> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[adamrher]

Here's a spaghetti plot and SST bias maps. 121 looks a lot more like 112. The SST bias plots show that the warm SSTs along the coastal upwelling regions have come down considerably in 121 (relative to 115,118). @gustavo-marques is this entirely due to reverting the opacity scheme back to MANIZZA_05? Was the opacity scheme responsible for the problematic mixing depths near the equator during summer (in runs 114-120)?

The equatorial pacific SSTs in 121 are not quite as cool as 112 (I expected they wouldn't be b/c we relaxed c8=4.95->4.5), although they are still quite a bit cooler than CESM2. I'm under the impression there are more MOM6 changes in the pipeline, in particular a potentially important bug fix?

[jedwards4b]

The mirrored run in /glade/derecho/scratch/jedwards/b.e30.BLT1850.ne30_t232_wgx3.121 is out to year 14.

[gustavo-marques]

@adamrher: runs 115-120 have Bodner23 turned on, and this option accounts for ~ 20-30 m in the MLD biases near the Equator. Similarly but less intense, reverting the opacity scheme (from Ohlman to Manizza) accounts for ~ 10 m in the MLD biases. Another difference from previous runs, including #114, is in KPP_CVt2 (a parameter for Stokes MOST convection entrainment), which changed from 1.6 (114) to 1.0 (121). This was not documented in the initial run description and is now fixed.

[adamrher]

Got it, thanks Gustavo. So Bodner23 is turned off in 121? If so, can you also add that to the run description?

[gustavo-marques]

Yes, it is. I just added that to the description. Thanks for catching that!

[dlawrenncar]

To be clear, I think we should extend this simulation.

…

On Mon, Dec 30, 2024 at 1:08 PM Gustavo Marques ***@***.***> wrote: Yes, it is. I just added that to the description. Thanks for catching that! — Reply to this email directly, view it on GitHub <#32 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFABYVCGIVW6YMDQWJV32A32IGR5JAVCNFSM6AAAAABUFJJVW2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDKNRVHA3TIMRVGM> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[adamrher]

It's running, and is currently in year 31.

[dabail10]

Here are the sea ice diagnostics. So far, 121 is more like 112. Still too high extent in SH winter, but better in summer.

https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/ice/b.e30_beta04.BLT1850.ne30_t232_wgx3.121-b.e30_alpha03d.BLT1850.ne30_t232_wgx3.112/ice/Hemis_seaice_visual_compare_obs_lens.html

[jedwards4b]

I now have 20 years in the ifx mirror run in /glade/derecho/scratch/jedwards/archive/b.e30.BLT1850.ne30_t232_wgx3.121. Can you run a comparison of diagnostics and note any differences of concern? Thanks

[adamrher]

@jedwards4b your ifx run looks fine to me, consistent with it being another realization of the 121 configuration.

[dabail10]

The seaice is a little different, however with this many years this is probably within variability.

https://webext.cgd.ucar.edu/BLT1850/b.e30.BLT1850.ne30_t232_wgx3.121/ice/b.e30.BLT1850.ne30_t232_wgx3.121-b.e30_beta04.BLT1850.ne30_t232_wgx3.121/ice/Hemis_seaice_visual_compare_obs_lens.html

[olyson]

Land diagnostics for the ifx mirror run are here
I don't really see any systematic differences between the two runs, looks like variability. @wwieder @slevis-lmwg

[dabail10]

I've updated the sea ice diagnostics through year 54 of the 121 run. We are concerned that the extent in both hemispheres is larger than 112.

https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/ice/b.e30_beta04.BLT1850.ne30_t232_wgx3.121-b.e30_alpha03d.BLT1850.ne30_t232_wgx3.112/ice/Hemis_seaice_visual_compare_obs_lens.html

[wwieder]

Sorry, getting caught up after time off. Seems like there are two issues here results from 121 + the 121ifx case? I'd agree with @olyson's assessment of land diagnostics that:

• Amazon biases are moving in the right direction (cooler and slightly wetter), although I'll note low LAI biases are still persistent and something we're working on with a new parameter file (based on run 120).
• ifx case seems similar to 121

[gustavo-marques]

Same for the ocean: ifx case similar to 121.
https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.121/ocn/121_vs_121b/intro.html