Page History

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The page will be updated as required. It was last changed on 1 March 12 May 2021.

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.

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The planned timetable for the implementation of the cycle 47r2 is as follows:

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

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Atmospheric composition content of the new cycle

Assimilation

• Update to TROPOMI SO2 assimilationNone

Observations

• No other changes compared to the observations used in 47r1.
  

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• Reduced volcanic outgassing of SO2 from certain volcanoes based on recent observations.
• Implemented cap on anthropogenic primary organic matter (OM) emissions to reduce excesses in highly polluted regions.
• Increased numerical precision in prescribed emission fields to remove artefacts.

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• Numerical improvements to the aerosol and chemistry schemes to accommodate running the forecasts in single precision as noted above.

Impact of the new cycle

A comprehensive evaluation report of the 47r2 e-suite has been prepared documenting all the changes and their impact on the forecasts. The changes of this upgrade were evaluated with independent observations for Q1 and Q3 of 2020:

• strong improvements for PM2.5 over China and India in both bias and RMSE because of reduced PM2.5 (the overall bias is now slightly negative) 
• nearly neutral impact for PM2.5 and PM10 elsewhere. Where biases were increased, the RMSE was often improved
• small reduction in tropospheric and surface ozone, which is an improvement 
• neutral results for CO 

Technical details of the new cycle

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