Monitoring of statospheric depletion of ozone layer.

Project Information

Grant agreement ID: ENV4970386

Project closed

Start date 1 December 1997

End date 30 November 1999

Funded under

• Specific programme of research and technological development in the field of environment and climate, 1994-1998

Total cost

No data

EU contribution

No data

Coordinated by

ACRI SA - MECANIQUE APPLIQUEE ET SCIENCES DE L'ENVIRONNEMENT
France

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Exploitable results

Dedicated server of external ozone data useful for validation purposes

SSummary The result is an operational basic data set which can be used as reference ozone profiles by the MSDOL community. The data set is easily accessible via a World Wide Web (WWW) server as hypermedia technology allowing a wide area information transfer within the MSDOL group. Based on this technology, an MSDOL site has been developed in order to provide the necessary information about the available products, data specification, and data transfer procedures. The website also gives access to the profile database and to the other products, with the adequate data selection tools. In order to respect copyright duties, a password is required for the download of specific products.

A coupled dynamic chemistry transport model and assimilation system

Summary: The first result of the project is a system able to assimilate spaceborne stratospheric ozone data into a DCTM model. Its exploitation is especially linked to research topics on stratospheric ozone trends and dynamics. Further this system could be distributed to external users for similar activities under license conditions. As stratospheric ozone measurements (from any sources) are sparse in time and space, the assimilation technique allows to refine the analysis by performing an optimal interpolation in the four dimensions. This is the major innovative feature of the present result. The system is today operational and as such has been also derived as an executable tool (see result 2). Expected benefit and use rank from the validation campaign optimization for new spaceborne sensors to the improvement of DCTM code by analysis of systematic discrepancies (especially in chemistry modeling and tropo/mesospheric boundary conditions) and long term monitoring. The system will be a development platform for data from other potential instruments in close co-operation with the other MSDOL members and extended partnership.

An operational software tool for GOMOS data assimilation

Summary: The executable tool (derived from result 1) is currently used on three different platforms: SUN, DEC ALPHA, and PC under LINUX. On a SUN ULTRA SPARC bi-processor 300 Mhz, one day of simulation is performed in about one hour of real time. Disk space occupation is 0.11 Mb per variable saved per time step. ACRI/SA/FMI are committed to exploit the tool. The platform will be Debian Linux, running in a PC with the kernel 2.2.12 or later for FMI, DEC ALPHA for SA and SUN for ACRI. After GOMOS has been launched, the tool will be used for assimilation of the GOMOS data. The assimilated data will be used both in the validation work and in the scientific research. This activity will be performed in the frame of the project OZVAL (part of the core validation programme of ENISAT Atmosphere Chemistry Mission). The tool will also be used by the UFOS project funded by DC13 (Ten-Telecom programme). UFOS is a pilot experiment involving WMO and WHO which will contribute to assess the effects on human health of increasing UV reaching the Earth's surface as a consequence of depletion of the stratospheric ozone layer. The production of high level products will be derived from a systematic exploitation of ENVISAT chemistry data assimilated in the tool. The system will be a development platform for data from other potential instruments in close co-operation with the other MSDOL members and extended partnership.