Description of upgrade

The CAMS IFS cycle 46R1 is based on ECMWF's  IFS cycle 46R1 . IFS Cycle 46r1 is an upgrade with many scientific contributions, including changes in the use of observations and in modelling. The new cycle also includes an upgrade of the vertical resolution from 60 model levels to 137 model levels

The page will be updated as required. It was last changed on 20.06.2019.

For a record of changes made to this page please refer to Document versions .

Further information and advice regarding the upgrade can be obtained from the Copernicus User Support.




Timetable for implementation

The planned timetable for the implementation of the cycle 46r1 is as follows:

DateEvent
08-05-2019Announcement of expected implementation date
09-07-2019 (TBC)

Implementation

The timetable represents current expectations and may change in light of actual progress made.

Current Status

IFS cycle 46r1 is going through its final testing phase.

Meteorological content of the new cycle

The meteorological changes can be found on the ECMWF  IFS CY46R1 page .

Atmospheric composition content of the new cycle

Assimilation

Observations

Emissions

Other model changes

Impact of the new cycle

The new cycle is being validated by the CAMS Validation team and the results will be presented in a validation report

Technical details of the new cycle

Changes to GRIB encoding


paramIdshortNamenameunitsGRIB editionComponentsTest data available

Model levels

210247aermr16Nitrate fine mode aerosol mass mixing ratiokg kg-12CAMS aerosol modelyes
210248aermr17Nitrate coarse mode aerosol mass mixing ratiokg kg-12CAMS aerosol modelyes

210249

aermr18Ammonium aerosol mass mixing ratiokg kg-12CAMS aerosol modelyes
Pressure levels
210247aermr16Nitrate fine mode aerosol mass mixing ratiokg kg-11CAMS aerosol modelyes
210248aermr17Nitrate coarse mode aerosol mass mixing ratiokg kg-11CAMS aerosol modelyes
210249aermr18Ammonium aerosol mass mixing ratiokg kg-11CAMS aerosol modelyes

Surface level

210250niaod550Nitrate aerosol optical depth at 550 nmdimensionless1CAMS aerosol modelyes
210251amaod550Ammonium aerosol optical depth at 550 nmdimensionless1CAMS aerosol modelyes


New model output parameters

Discontinued model parameters

The "SO2 aerosol precursor" (aermr12/210012 and related diagnostics 215168–215175) have been discontinued, as the aerosol scheme now uses the same SO2 tracer as the chemistry (so2/210122).

Similarly, the sulfate tracer in the chemistry scheme (so4/217020 and related diagnostic tcso4/218020) is no longer used, as the chemistry now uses the same sulfate tracer as the aerosol (aermr11/210011).

Old grib nameOld grib short nameOld grib parameter ID
New grib nameNew grib short nameNew grib parameter ID
SO2 precursor mixing ratioaermr12210012
Sulphur dioxideso2210122
Sulfateso4217020
Sulphate Aerosol Mixing Ratioaermr11210011


Software

ecCodes

ecCodes version 2.12.1 provides full support for the new CAMS model output parameters introduced in IFS Cycle 46r1.

Availability of test data from the cycle 46r1 test suites

The CAMS operational FTP server (ECPDS) currently serves one day of test data (17 March 2019) in the directory "/DATA/CAMS_GLOBAL_TEST" and "/DATA/CAMS_EUROPE_BC_TEST" for global and regional boundary condition data, respectively. More details can be found  here .

Document versions


DateReason for update
11.04.2019

Initial version

30.04.2019

Listing of all changes and their expected impact.
20.06.2019Decision on expected implementation date