FWmaHIST_MAM4_nudged_f19.carma_trop_strat.may11_2023.1990_1995 mixfix cases

[tilmes]

Different model runs were performed to test differences in the mie code as discussed in https://github.com/NCAR/CARMA_dev/discussions/29 Model simulations are tested for FWmaHIST nudged cases 1990-1993 (or longer)

• Pengfei's code Original CARMA code, from Toon and Ackerman, supports core/shell: old_miess = FWmaCARMAnudged.f19_f19_mg17.carma_trop_strat.1990_1995.old_miess.cam.h0.1990-1995.nc
• As old code but ref.Index calculation assumes only dst in core (by mistake): new_miess = FWmaCARMAnudged.f19_f19_mg17.carma_trop_strat.1990_1995.new_miess.cam.h0.1990-1995.nc
• bmies Homogeneous sphere, from Bohren and Huffman= FWmaCARMAnudged.f19_f19_mg17.carma_trop_strat.1990_1995.bmies.cam.h0.1990-1995.nc
• new_miess_fix: Ref.Index calculation assumes fraction of dust and BC in core (before equal parts of dust and bc were assumed): =FWmaCARMAnudged.f19_f19_mg17.carma_trop_strat.1990_1995.new_miess.fix.cam.h0.1990-1995.nc
• new_miess_mixfix =FWmaCARMAnudged.f19_f19_mg17.carma_trop_strat.1990_1995.new_miess.mixfix.cam.h0.1990-1995.nc
• sulfate and water in the pure sulfate and in the shell : new_miess_mixfix2 = FWmaCARMAnudged.f19_f19_mg17.carma_trop_strat.1990_1995.new_miess.mixfix2.cam.h0.1990-1995.nc
• new_miess_mixfix3 =FWmaCARMAnudged.f19_f19_mg17.carma_trop_strat.1990_1995.new_miess.mixfix3.cam.h0.1990-1995.nc
• mam = FWmaHIST_MAM4_nudged_f19.carma_trop_strat.may11_2023.1990_1995.region.5TgS.rad.cam.h0.1990-1995.nc

[tilmes]

@cbardeen Here are some results of the runs I did: mixfix causes a reduction in extinction in polar latitudes, mixfix2 is changing this back. Extinction comparisons 1990 (background conditions)

Relative differences between different schemes:

Extinction comparisons 1991

Comparisons to MAM (new mixfix2 and mixfix3 look good over Mt Pinatubo (currently till the end of 1991)

Total AOD for SOA, POM, BC closer to MAM when using mixfix2 or mixfix3:

[tilmes]

@cbardeen some interesting changes: Mixfix2 does get rid of a peak AODSO4dn at the start of Mt Pinatobu. AOD SOA, BC, POM are now more similar to MAM, is seems more realistic. Absorption has not changed much with mixfix2 and mixfix3.

[tilmes]

here are some more plots, including 1992:

[tilmes]

@cbardeen here are the CAMcem runs in comparison to ATom, it helped a little bit, but indeed not much if using a log-scale for the comparison, the updated mixfix3 is shown in orange