Data assimilation of atmospheric CO 2 at ECMWF in the context of the GEMS project. Richard Engelen ECMWF. Thanks to Soumia Serrar and Fr é d é ric Chevallier. Global and regional Earth-System (atmosphere) Monitoring using Satellite and in-situ data (GEMS).
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Thanks to Soumia Serrar and Frédéric Chevallier
T. Hollingsworth1, O. Boucher2, H. Eskes3,
C. Granier4, V.H. Peuch5, P. Rayner6,
M. Schultz7, A. Simmons11 ECMWF; 2 UK Met Office; 3 KNMI, NL;
4 Service d'Aéronomie CNRS, 5 Meteo-France;
6 Laboratoire des Sciences du Climat et de l‘Environnement;
7 Forschungszentrum Jülich, Germany
Greenhouse Gases (GHG)
Global Reactive Gases (GRG)
Regional Air Quality (RAQ)
Production (PRO) & Validation (VAL)
Carbon fluxes from the terrestrial biosphere on August 10, 2003 (heat wave in Europe and drought in the USA) as simulated by the model ORCHIDEE
4D-Var atmospheric data assimilation
(12 hour assimilation window)
4D-Var flux inversion
(1 year inversion window)
Fluxes used in the model
Monthly mean CO2 column-mean mixing ratios, after 8 months of assimilating AIRS radiances, show small but significant changes to a simulation with free-running CO2.
After validation these differences will be used to estimate modifications in the prior surface flux fields.
The AIRS radiances are also able to adjust the shape and amplitude of a CO2 plume resulting from extensive biomass burning over Africa.
The GEMS monitoring system will have the capability to follow these plumes in near-real time in terms of CO2, CO, and aerosol concentrations, constrained by various satellite observations.
Comparisons with flight data over Hawaii (courtesy of Pieter Tans, NOAA/ESRL, shows a clear improvent of the analysis over the free-running model.
The top plot shows a best-case individual comparison (11 May 2003).
The bottom plot shows an average over all available flight profiles between 1 January and 30 October 2003.
Blue: free-running model
Blue: free-running model
11 May 2003
9 October 2003
There is a summer trend in atmospheric CO2 that is not corrected by the AIRS observations at the moment.
Blue: without fire emissions
Red: with fire emissions