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Simultaneous assimilation of ENVISAT/MIPAS and ODIN/SMR ozone profile into a chemistry transport model

Sebastien Massart(2) and Daniel Cariolle(1)

(1) CERFACS, 47 avenue Gaspard Coriolis, 31057 TOULOUSE cedex 01, France
(2) CERFACS, 42 avenue Gaspard Coriolis, 31057 TOULOUSE cedex 01, France


Because of its role both in troposphere and in stratosphere, ozone is one of the most important trace species in the atmosphere. In the context of an increasing number of space-based remote sensing instruments, data assimilation is the most appropriate way to combine the information provided by the observations and the numerical models.

We have developed a 3D-Fgat assimilation algorithm to analyse the ozone profiles from satellites using the Météo-France chemistry transport model Mocage. This algorithm is successfully used with the March 2003 GOME measurements and the July to November 2003 MIPAS measurements. We further plan to assimilate SMR ozone profiles during the same period than MIPAS ones. The comparison of the two analysed ozone fields from respectively the assimilation of MIPAS and the assimilation of SMR will give precious informations on the bias between the two datasets and their respective errors. This information will be used to implement the simultaneous assimilation of the measurements from both instruments.

The paper will describe the methodology used to assimilate simultaneous satellite ozone data supplied by several instruments. Results from the assimilation of MIPAS and SMR ozone profiles will illustrate this methodology.


Workshop presentation

Full paper

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry