A tale of heat and climate in NorESM3-dev beta simulations #346
Replies: 11 comments 13 replies
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A quick comparison between our current version and b01. Here is the latitudinal temperature profile (only ne16/LM): Beta_01 (#195) temperature over land: And Beta_11 (#338) temp over land: A couple of quick observations:
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The impact of ocean albedo schemes. Since Beta01, we started using Taylor albedo over ocean. I tested a simulation (#339) with
in user_nl_cpl
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We are very much lower on |
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I have been looking closer at the history of our simulations vs lat. temp profile: This figure is a bit messy, but if you look closer there are a few interesting things to take from this:
I think we should investigate further what happened between b01 and b02. But maybe we could also test with lower dust_emis_fact? Would that be reasonable, @DirkOlivie? |
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What happened between b01 and b02:
From ChangeLog file: |
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Thanks @TomasTorsvik ! I think it is very clear from the log: |
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This is adding to the comment #344 (comment) with a completed 30 year simulation, exploring the impact of reverting back to the BLOM configuration as of summer 2025 in otherwise a recent ne16 configuration. Important to note is the BLOM configuration tested keeps the changes that we believe avoided the unrealistic Southern Ocean variability present in beta01 simulations. I will come back to that in later comments. Years 11-30 has generally much colder surface temperature than #332
Even colder when comparing years 11-30 to the ne16 beta01 spinup (#191):
I guess the conclusions in #344 (comment) still holds. |
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SH storm-track activity for the baseline run with ocean_albedo_scheme=0 (#339) compared to the run with ocn_surface_flux_scheme = 0 & add_gusts = .true. (#340): SH storm-track activity for the baseline run (#339) compared to the run with ocn_surface_flux_scheme = 0 & add_gusts = .false. (#341): SH storm-track activity for the baseline run (#339) compared to the run with ocn_surface_flux_scheme = 2 (#342): Summary of area-mean RMSE (values shown in left titles subplots above), red cells indicate that the RMSE values are larger compared to the baseline and blue that they are smaller: |
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NH storm-track activity for the baseline run with ocean_albedo_scheme=0 (#339) compared to the run with ocn_surface_flux_scheme = 0 & add_gusts = .true. (#340): NH storm-track activity for the baseline run (#339) compared to the run with ocn_surface_flux_scheme = 0 & add_gusts = .false. (#341): NH storm-track activity for the baseline run (#339) compared to the run with ocn_surface_flux_scheme = 2 (#342): Summary of area-mean RMSE (values shown in left titles subplots above), red cells indicate that the RMSE values are larger compared to the baseline and blue that they are smaller: |
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Trying to understand the impact of BLOM changes going from beta01 and later beta releases, I did some additional 30 year long simulations:
Comparing surface temperature for years 11-30 of #351 with beta01 (#191), shows much colder Southern Ocean and a slightly colder global mean temperature. Some warming in NH is seen. The impact of the BLOM changes to avoid the unrealistic Southern Ocean (SO) variability gives a large and interannually stable winter sea-ice extent in SO, explaining parts of the cooling seen going from beta01 to later versions, but far from all. Comparing surface temperature for years 11-30 of #352 with beta01 (#191), shows some of the same as above, but the warming of NH and cooling of SH is enhanced. When comparing years 11-30 of #352 with years 521-550 of the recent beta10 simulation #332, one gets an impression of the impact of using identical recent BLOM setup, but beta01 and beta10 for other components. Here the SST difference over open ocean is modest, while beta01 is much warmer over land and in the Arctic. It should be mentioned that short simulations #344, #351 and #352 start from CLM, BLOM, iHAMOCC and CICE initial conditions. This is consistent when comparing to beta01 (#191), while #332 has gone through a long spinup period. |
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I have transferred 30 years of data for #347 and 10 years of #348 to /nird/datalake/NS9560K/noresm3/cases/ if someone has the time to dig into CAM beta01. I also prolonged the #340 , to see the impact on sea ice. Diagnostics here: ADF and noresm |
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The current version of NorESM3dev is rather cold, especially over land and at high latitudes. That has not always been the case, e.g. in beta01 the surface climate was much warmer. We want to pin down the model development causing the cooling. To do so we will
Table on beta changes, parameter updates, links to experiments
(Contact @TomasTorsvik if you need access to edit)
Please contribute with results in this discussion
@DirkOlivie @kjetilaas @matsbn @TomasTorsvik @oyvindseland @MichaelSchulzMETNO
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