NHIST simulations

[adagj]

I suggest we gather some results from our historical test simulations here. The relevant issues (so far) are #196 , #197 , #313
I have compared to NorESM2-LM in the figure below. In general, we have colder surface temperature, much higher cloud fraction - especially high clouds. The ocean response is warmer, fresher, and the circulation weaker. I'm a bit worried about the oscillations in the Drake Passage transport.
And are we running the current nhist #313 without volcanic forcing?

@gold2718 @DirkOlivie @kjetilaas @oyvindseland @matsbn

[DirkOlivie]

Hi @adagj , yes we are running with volcanic forcing (CMIP6). I checked the atm_in, it contains :

&prescribed_volcaero_nl
 prescribed_volcaero_datapath           = '/cluster/shared/noresm/inputdata/atm/cam/volc'
 prescribed_volcaero_file               = 'CMIP_CAM6_radiation_v3_reformatted.nc'
/

I can check the timeseries of total AOD in the output - volcanoes should be visible in there.

[adagj]

Thanks for checking @DirkOlivie

[matsbn]

Thanks, @adagj! Looking at time series of Drake passage transport in piControl simulations, there seems to be more variability in NorESM3-dev compared to NorESM2 (I guess we should ignore the beta01 simulations in this respect, since we had the erratic SO oscillations still present at that time). Although the beta09 NHIST variability seems to be on the high side compared to piControl, I'm not very worried, but we should continue to monitor it.

[adagj]

Updated figures

@kjetilaas

[adagj]

Here is the ADF diagnostics for the years 1979 - 2004 compared to ERA

Pretty cold land and high latitudes...

@kjetilaas

[kjetilaas]

Thanks for all of this, @adagj! Indeed, the polar regions are very cold. And some of the land regions. I will run the land diagnostics and ping you when it's ready.

[kjetilaas]

Nice to see that the surface air temperature anomaly looks so good, though :)

[kjetilaas]

The files are now finally copied over to NIRD and land diagnostics are here: https://ns9560k.web.sigma2.no/datalake/diagnostics/noresm/kjetisaa/NorESM_Key_Simulations/nhist.ne16pg3_tn14.nhist_cmip7.constLU.20260118/
@adagj

[tjiputra]

The ERA5 has a warm bias 5-10C over Arctic sea-ice compared to observations:
https://www.nature.com/articles/s41467-019-11975-3

[adagj]

Yes, good point @tjiputra . But that is for winter-time clear-sky ice surface temperature. If you look at DJF temperature anomaly - it is up to - 17C in noresm3

[adagj]

ADF comparison to ERA5 years 1979 - 2012