Aerosol effects in OpenIFS 43r3?

Joakim_Kjellsson
Wed, 09 Feb 2022 10:21:15 +0000
OpenIFS

Good morning

I've been digging into understanding how aerosols are treated in OpenIFS 43r3v1. Some output from my NODE file is at the end of this post.

My questions boil down to:

1) Is there any treatment of aerosol indirect effects, i.e. aerosol-cloud interactions? I only see direct impacts on SW and LW forcing.

2) Aerosols are just a monthly climatology. Can I somehow use time-varying aerosol forcing for e.g. AMIP simulations of 1979-2014? Something like MACC SPv2 would be fantastic. Can I use something for pre-industrial conditions, when there was definitely sea salt and dust, but very little anthropogenic emissions?

So far, my AMIP simulations for 1979-2014 show some cooling of global-mean surface temperature around 1991-1993, which would be consistent with the Pinatubo eruption. But I have a feeling that this is a result of the observed SSTs and not any aerosol effect. Does that make sense?

Many thanks
Joakim

From my NODE file:

General settings:
Data files expected in "ifsdata/"
Clear-sky calculations are ON (do_clear=T)
Saving intermediate radiative properties OFF (do_save_radiative_properties=F)
Saving spectral flux profiles OFF (do_save_spectral_flux=F)
Saving surface shortwave spectral fluxes ON (do_surface_sw_spectral_flux=T)
Gas model is RRTMG-IFS (i_gas_model=1)
Aerosols are ON (use_aerosols=T)
Longwave derivative calculation is ON (do_lw_derivatives=T)

Reading NetCDF file ifsdata//aerosol_ifs_rrtm_43R3.nc
Reading mass_ext_sw_hydrophobic(14,14)
Reading ssa_sw_hydrophobic(14,14)
Reading asymmetry_sw_hydrophobic(14,14)
Reading mass_ext_lw_hydrophobic(16,14)
Reading ssa_lw_hydrophobic(16,14)
Reading asymmetry_lw_hydrophobic(16,14)
Reading mass_ext_sw_hydrophilic(14,12,5)
Reading ssa_sw_hydrophilic(14,12,5)
Reading asymmetry_sw_hydrophilic(14,12,5)
Reading mass_ext_lw_hydrophilic(16,12,5)
Reading ssa_lw_hydrophilic(16,12,5)
Reading asymmetry_lw_hydrophilic(16,12,5)
Reading relative_humidity1(12)
Closing NetCDF file ifsdata//aerosol_ifs_rrtm_43R3.nc
Aerosol mapping:
1 maps on to hydrophilic type 1: Sea salt, bin 1, 0.03-0.5 micron, OPAC
2 maps on to hydrophilic type 2: Sea salt, bin 2, 0.50-5.0 micron, OPAC
3 maps on to hydrophilic type 3: Sea salt, bin 3, 5.0-20.0 micron, OPAC
4 maps on to hydrophobic type 7: Desert dust, bin 1, 0.03-0.55 micron, Woodward 2001, Table 2
5 maps on to hydrophobic type 8: Desert dust, bin 2, 0.55-0.90 micron, Woodward 2001, Table 2
6 maps on to hydrophobic type 9: Desert dust, bin 3, 0.90-20.0 micron, Woodward 2001, Table 2
7 maps on to hydrophilic type 4: Hydrophilic organic matter, OPAC
8 maps on to hydrophobic type 10: Hydrophobic organic matter, OPAC (hydrophilic at RH 20-30%)
9 maps on to hydrophobic type 11: Black carbon, Olivier Boucher
10 maps on to hydrophobic type 11: Black carbon, Olivier Boucher
11 maps on to hydrophilic type 5: Ammonium sulfate, GACP
12 maps on to hydrophobic type 14: Stratospheric sulfate (hydrophilic ammonium sulfate at RH 20-30%)
Reading NetCDF file ifsdata//mcica_gamma.nc
Reading fsd(81)
Reading x(1000,81)
Closing NetCDF file ifsdata//mcica_gamma.nc
Tropospheric bacground uses aerosol type 8
Stratospheric bacground uses aerosol type 12

8 posts - 6 participants