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Assimilation
- No updates
Observations
- IASI SO2 data with altitude information assimilated into volcanic SO2 tracer
- Passive monitoring of OMPS SNPP limb profiler O3 data
- Passive monitoring of NOAA-21 OMPS nadir-profiler O3 data
- Passive monitoring of GEMS O3 and NO2 data
Change in passively monitored TROPOMI HCHO data to include negative values when creating averaged observations
Emissions
- CAMS-GLOB-ANT 5.3 (based on EDGAR 5, used in 48r1) has been replaced by CAMS-GLOB_ANT 6.1 (based on EDGAR 6 and 7)
- CAMS-GLOB-BIO 3.1 climatology (as in 48r1 )
- CAMS-GLOB-Soils 2.4 (was "old" POET-based soil NOx)
- CAMS-GLOV-VOLC-CLIM (2005-2021) (was old climatology based on Carn et al., 2017)
- GFAS emissions fix to reduce NOx emissions in boreal regions and NH3 in tropical peat fire regions, to correct for outdated emission factors
Model changes
Aerosol developments:
- EQSAM4Clim module activated for gas-phase aerosol partitioning
- computation of aerosols, cloud and precipitation pH
- use of online cloud pH in aqueous chemistry, of online precipitation pH in wet deposition of relevant chemical species
- use of a temperature dependent activation function to determine the fraction of hydrophilic aerosol subjected to wet deposition in mixed clouds
- coupled stratospheric sulphate aerosol formation with BASCOE gas-phase chemistry.
- revised carbonaceous aerosol (OM and BC) aging scheme (from hydrophobic to hydrophilic)
- new aerosol optical properties to account for hydrophilic and aspherical dust
- use of convective gusts in the dust emission scheme
- assumed size distribution consistent with optics - revised PM2.5 formulae to reflect this
- implementation of the Gong 03 sea-salt aerosol emission scheme to replace Monahan 1986 (applied on the whitecap fraction computed with the Albert 16 scheme)
- updates of dust source function
Reactive gases developments:
- Updates to photolysis quantum yields and cross sections for selected trace gases in troposphere
- Tuning of ozone depletion modeling in the stratosphere
- dry deposition scheme to use IFS stomatal resistance
- De-activation of dry deposition of CO
- Lopez-lightning emission parameterisation for Lightning Nox emissions
Impact of the new cycle
A comprehensive evaluation report of the 49r1 e-suite, documenting all the changes and their impact on the forecasts will be provided ahead of the actual implementation. Initial testing results show improved aerosol forecasts.
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