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changes.mady.by.user Richard Engelen

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changes.mady.by.user Martin Suttie

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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

    No updates

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  • CAMS-GLOB-ANT 5.3 (based on EDGAR 5, used in 48r1) has been replaced by CAMS-GLOB_ANT 6.1 (based on EDGAR 6 and 7)

Model changes

  • CAMS-GLOB-BIO 3.1 climatology (as in 48r1 )  
  • CAMS-GLOB-Soils 2.4  (was "old" POET-based soil NOx)
  • CAMS-GLOB-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  • GFAS emissions fix to reduce NOx emissions in boreal regions and NH3 in tropical peat fire regions, to correct for outdated emission factors  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  
  • Improvements to the aerosol removal processes (wet deposition) and aerosol ageing in the atmosphere
  • Modelling of the formation of (secondary) aerosol from precursor gases with more detail (EQSAM4Clim module has been activated)

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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The GRIB model identifiers (generating process identification number) for cycle 49r1 will be changed as follows:

GRIB 1

Section 1

Octets

GRIB 2

Section 4

Octets

ecCodes key 

Component

Model identifier

48r1

49r1

6

 14  

generatingProcessIdentifier

Atmospheric model

154

158

6

 14  

generatingProcessIdentifier

Ocean wave model

119

 106

For all parameters in GRIB 2 the Master Tables Version Number will be changed as follows:

GRIB 2

Section 1

Octets

ecCodes key 

Master Tables Version Number

48r1

49r1

 10 

tablesVersion

30

32

Software

To handle the data of Cycle 49r1 we recommend to use the ECMWF software packages 

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Note
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The CAMS operational FTP server (ECPDS) will serve the most recent 3 days of test data, once the e-suite is running in near-real-time, in the directories "/DATA/CAMS_GLOBAL_TEST" and "/DATA/CAMS_EUROPE_BC_TEST" for global and regional boundary condition data, respectively.

In addition, surface level fields (model level 137) will be provided as individual files in the "/DATA/CAMS_GLOBAL_ADDITIONAL_TEST" directory. 

Users wanting to access the output from the current test system for a longer period can access the data from 1 September 2022 June 2023 onwards directly on MARS or through the Atmosphere Data Store. More details can be found here: Accessing CAMS 49r1 test data.

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