ICDC7, Boulder 25 - 30 September 2005 Estimation of atmospheric CO 2 from AIRS infrared satellite radiances in the ECMWF data assimilation system Richard.

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ICDC7, Boulder September 2005 Estimation of atmospheric CO 2 from AIRS infrared satellite radiances in the ECMWF data assimilation system Richard Engelen European Centre for Medium-Range Weather Forecasts

ICDC7, Boulder September 2005 Why do we need satellite data? Red ‘x’ indicates mean flux across 15 models Blue circles indicate mean a posteriori uncertainty (‘within’ model error) Red error bars indicate model spread (‘between’ model error) ‘Within’ model uncertainty larger than ‘between’ model uncertainty for most regions From Gurney et al. (2002) Current inversion system is data limited!

ICDC7, Boulder September 2005 What observations do we have? Radiance = F ( T, CO 2, H 2 O, O 3, CO, CH 4, N 2 O ) Atmospheric Infrared Sounder (AIRS)

ICDC7, Boulder September 2005 Why do we do this at a weather forecast centre Data Assimilation Various sources of atmospheric observations are used to estimate atmospheric state in consistent way. Attribution of random and systematic errors is complicated. Spatial and temporal interpolation of information is done with atmospheric transport model. Data Assimilation Various sources of atmospheric observations are used to estimate atmospheric state in consistent way. Attribution of random and systematic errors is complicated. Spatial and temporal interpolation of information is done with atmospheric transport model. Stand-alone Retrieval Only observations from single satellite platform are used to estimate atmospheric state. Attribution of random and systematic error less complicated. Individual retrievals need to be gridded and averaged to produce 3-dimensional fields. Stand-alone Retrieval Only observations from single satellite platform are used to estimate atmospheric state. Attribution of random and systematic error less complicated. Individual retrievals need to be gridded and averaged to produce 3-dimensional fields.

ICDC7, Boulder September D-Var Data Assimilation 4-dimensional variational data assimilation is in principle a least- squares fit in 4 dimensions between the predicted state of the atmosphere and the observations. The adjustment to the predicted state is made at time T o, which ensures that the analysis state (4-dimensional) is a model trajectory.

ICDC7, Boulder September D-Var Data Assimilation 4-dimensional variational data assimilation is in principle a least- squares fit in 4 dimensions between the predicted state of the atmosphere and the observations. The adjustment to the predicted state is made at time T o, which ensures that the analysis state (4-dimensional) is a model trajectory. X0X0

ICDC7, Boulder September D-Var Data Assimilation 4-dimensional variational data assimilation is in principle a least- squares fit in 4 dimensions between the predicted state of the atmosphere and the observations. The adjustment to the predicted state is made at time T o, which ensures that the analysis state (4-dimensional) is a model trajectory. CO 2 is added to the state vector as a tropospheric column amount for each AIRS observation. X0X0

ICDC7, Boulder September 2005 CO 2 column estimates Mar 2003 Mar 2004 Sep 2003 Mar 2003

ICDC7, Boulder September 2005 Comparison with in-situ observations Japanese flight data kindly provided by H. Matsueda, MRI/JMA

ICDC7, Boulder September 2005 Can we learn from current satellite observations? TM3 SimulationsLMDz Simulations AIRS Estimates Tiwari et al., submitted to JGR, 2005; see also his poster

ICDC7, Boulder September 2005 Can we learn from current satellite observations? TM3 SimulationsLMDz Simulations AIRS Estimates Tiwari et al., submitted to JGR, 2005; see also his poster

ICDC7, Boulder September 2005 Next steps CO 2, CH 4, CO, and N 2 O are being implemented in the full 4D-Var assimilation system. Data from AIRS, IASI, CrIS, Sciamachy, OCO, and GOSAT can then be used in a consistent way to estimate the atmospheric concentrations of these gases. In-situ data will initially be used for validation, but could also be used in reanalysis mode. Aim is to provide consistent atmospheric distributions that are accurate enough to improve models and inverse flux estimates. No plans (yet) to directly estimate fluxes within the 4D-Var, because of assimilation time window restrictions.

ICDC7, Boulder September 2005 Using climatological fluxes (CASA, Takahashi, and Andres) we have made a 2 year run to test the system at resolution T159 (~ 1.125˚). CO 2 in ECMWF forecast model

ICDC7, Boulder September 2005 Using climatological fluxes (CASA, Takahashi, and Andres) we have made a 2 year run to test the system. CO 2 in ECMWF forecast model

ICDC7, Boulder September 2005 Conclusions First relatively simple implementation of CO 2 variable in operational data assimilation system proved successful Work in progress to build a full 4D-Var greenhouse gas data assimilation system that can combine observations from various satellite sensors to estimate atmospheric CO 2 These 4D atmospheric fields will then hopefully contribute to a better quantification and understanding of the carbon surface fluxes.