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Atmospheric composition content of the new cycle

Assimilation

• • No changesNew model-error covariance matrices for aerosol and chemistry at 137 levels.

Observations

• • Assimilation of PMAp aerosol optical depth (AOD) from METOP-A and METOP-B over land and ocean. The Polar Multi-Sensor Aerosol Product (PMAp) is a combined aerosol product based on measurements by the GOME-2, AVHRR and IASI instruments. PMAp data over land and PMAp data from METOP-B are introduced in this cycle. The impact of PMAp on the analysis and subsequent forecast is low, but at the same time important to increase resilience against potential failures of the two MODIS instruments.

Model

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Updated optical properties for aerosol. This has a small impact on the optical depth of organic matter and of sea-salt: both are less extinctive per unit mass.

• • TBC

Model

• • New nitrate and ammonium aerosol species, coupled to the gas-phase nitrogen chemistry. See new model parameters below
    

  • Sulfur species (SO2 and SO4) coupled between chemistry and aerosol schemes. See discontinued parameters below.

  • Updates to chemical reaction rates.

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. 

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New model output parameters

TBC

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).

Software

ecCodes

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

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