Implementation of IFS cycle 47r1

Description of upgrade

The CAMS IFS cycle 47R1 is based on ECMWF's  IFS cycle 47R1 . This is an upgrade with many scientific contributions, including changes in the use of observations and in modelling.

The page will be updated as required. It was last changed on 23rd September 2020.

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 47r1 is as follows:

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

Current Status

IFS cycle 47r1 is going through its final preparation phase.

Meteorological content of the new cycle

The meteorological changes can be found on the ECMWF  IFS CY47R1 page .

Atmospheric composition content of the new cycle

Assimilation

• No changes compared to 46R1

Observations

• Activation of TROPOMI volcanic SO2 data. No other changes compared to the observations used in 46R1.
  

Emissions

• Updated emissions inventories: CAMS_GLOB_ANT v4.2 (anthropogenic) and volcanic outgassing (based on Carn et al., 2017).
• Updated to GFASv1.4 biomass-burning emissions.
• Excluded agricultural waste burning from CAMS_GLOB_ANT, avoiding double-counting with GFAS.
• Improved diurnal cycle (CO, NO, SO2, NH3) and vertical profile for anthropogenic emissions (SO2, all over sea).

Other model changes

• Hybrid Linear Ozone (HLO) scheme (a Cariolle-type linear parameterisation of stratospheric ozone chemistry using the multi-year mean of the CAMS reanalysis as mean state) .
• New sea-salt emission scheme based on Albert et al. (2016), providing better agreement with measured sea-salt size distribution.
• Updated dust source function, reducing excess dust in the Sahara, Middle East and other regions, and restoring missing dust over Australia.
• Revised coefficients in UV processor, based on ATLAS3 spectrum.

Impact of the new cycle

A comprehensive evaluation report of the 47r1 e-suite has been prepared documenting all the changes and their impact on the forecasts. Noteworthy improvements w.r.t to the current o-suite cycle 46r1 are: 

• strongly reduced stratospheric ozone bias (10-20 hPa range) because of the HLO ozone scheme
• strongly reduced positive SO2 surface bias, especially during night time, in Europe and North-America because of the introduction of injection heights for SO2 emissions
• increased fine and ultra fine mode sea-salt and reduced corse mode sea-salt because of the new sea-salt emissions scheme
• increased surface PM2.5 leading to improvements over Europe
• reduced positive dust biases in desert-affected regions, which also reduce overestimation of PM10

Technical details of the new cycle

New and discontinued parameters

There are no new or discontinued parameters in the disseminated data compared to 46r1.

Software

Availability of test data from the cycle 47r1 test suites

The CAMS operational FTP server (ECPDS) currently serves the most recent 3 days of test data 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) are provided as individual files in the 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 October 2019 onwards directly on MARS or through our WebAPI. More details can be found here: https://confluence.ecmwf.int/display/COPSRV/Accessing+CAMS+47r1+test+data.

Document versions