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Title Assimilation of IASI satellite CO fields into a global chemistry transport model for validation against aircraft measurements
Type Publication
Abstract:

This work evaluates the IASI CO product against independent in-situ aircraft data from the MOZAIC program and the POLARCAT aircraft campaign. The validation is carried out by analysing the impact of assimilation of eight months of IASI CO columns retrieved for the period of May to December 2008 into the global chemistry transport model LMDz-INCA. A modelling system based on a sub-optimal Kalman filter was developed and a specific treatment that takes into account the representativeness of observations at the scale of the model grid is applied to the IASI CO columns and associated errors before their assimilation in the model. Comparisons of the assimilated CO profiles with in situ CO measurements indicate that the assimilation leads to a considerable improvement of the model simulations in the middle troposphere as compared with a control run with no assimilation. Model biases in the simulation of background values are reduced and improvement in the simulation of very high concentrations is observed. The improvement is due to the transport by the model of the information present in the IASI CO retrievals. Our analysis also shows the impact of assimilation of CO on the representation of transport into the Arctic region during the POLARCAT summer campaign. A considerable increase in CO mixing ratios over the Asian source region was observed when assimilation was used leading to much higher values of CO during the cross-pole transport episode. These higher values are in good agreement with data from the POLARCAT flights that sampled this plume.

Available from https://www.atmos-chem-phys.net/12/4493/2012/
Author
ANCELLET Gerard
CAMMAS Jean-Pierre
LAW Kathy
NEDELEC Phillipe
PARIS Jean-Daniel
SCHLAGER Hans georg
To see the full list of authors, please check the document.
Reference
Journal Atmospheric Chemistry and Physics
Volume 12
Pages 4493-4512
Year 2012
Times cited 6
Institute country France
Type of science
  • Atmospheric dynamics (includes thermodynamics)
  • Gas chemistry
Field of science
  • Troposphere
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