f.e30_alpha04a.FMTHIST.ne30_L93.002

[cecilehannay]

Purpose:

testing new dust scheme

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Description:

Same as #604 except:

dust_emis_method = 'Leung_2023'
interpolate_nlat = 192, 192, 192, 192, 192, 192, 192, 192, 192, 192
interpolate_nlon = 288, 288, 288, 288, 288, 288, 288, 288, 288, 288

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Case directory:

• Locally (if still available): /glade/campaign/cesm/cesmdata/cseg/runs/cesm2_0/f.e30_alpha04a.FMTHIST.ne30_L93.002

• On github: https://github.com/NCAR/amwg_dev/tree/f.e30_alpha04a.FMTHIST.ne30_L93.002

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  Sandbox:

• Locally (if still available): /glade/work/hannay/cesm_tags/cesm3_0_alpha04a

• On github: https://github.com/ESCOMP/CAM/tree/cesm3_0_alpha04a

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  Diagnostics:

• ADF diags (if available) https://webext.cgd.ucar.edu/FMTHIST/f.e30_alpha04a.FMTHIST.ne30_L93.002/atm/

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  Output:

• Raw output on derecho (if still available) /glade/derecho/scratch/hannay/archive/f.e30_alpha04a.FMTHIST.ne30_L93.002/

• CAM Climos: /glade/campaign/cgd/amp/amwg/climo/f.e30_alpha04a.FMTHIST.ne30_L93.002

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  Contacts: @cecilehannay @tilmes @adamrher @PeterHjortLauritzen

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  Extra details:

[cecilehannay]

From @adamrher:

WE have a run 10 year FMTHIST runs using the cesm3_0_alpha04a tag. One run with the Zender scheme (f.e30_alpha04a.FMTHIST.ne30_L93.001) and one with the Leung_2023 scheme (f.e30_alpha04a.FMTHIST.ne30_L93.002). Attached are some plots of the TOA radiation. There is an increase in LWCF of +1.143 W/m2, primarily due to the stronger longwave forcing over the NH storm track regions, most notably the region from eastern Asia to the north Pacific. The SWCF is -0.474 W/m2 cooler, and I think this is mainly occurring in the same region where the LWCF is increasing.

FSNTC decreases globally (290.09 W/m2 -> 289.323 W/m2), FLNTC decreases (263.254 W/m2 -> 262.965 W/m2). This means we are absorbing less SW (-0.767 W/m2), and emitting less LW to space (-0.289 W/m2).

All of these changes add up to a larger RESTOM (0.422 W/m2 -> 0.683 W/m2). While the LWCF changes are welcome, RESTOM being more positive is not ideal from a tuning perspective. I'd like to reconsider the sea salt emission factor to try and further reduce FSNTC -- we really need a way to back off clubb_c8 and thin out the low clouds.

temp_SWCF.pdf temp_RESTOM.pdf temp_LWCF.pdf