Chemical data assimilation

Principal Investigator

Dr. Hamse Mussa
Centre for Atmospheric Science
Department of Chemistry
University of Cambridge
Lensfield Road
Cambridge CB2 1EW

david.lary@atm.ch.cam.ac.uk

Project description

Development is needed for the ECMWF chemical parameterisation of ozone photochemistry. The work done at Cambridge can facilitate this. We propose to use a complete chemical scheme at low resolution instead of a poor chemical parameterisation at high resolution.
We envisage building an independent chemical analysis module to work alongside the current analysis system. Inputs to this module would be T, p, PV & O3 and it would return the suitable O3 chemical tendency. The optimum combination of resolution and chemical scheme complexity needs to be determined.
Possible applications are numerous, including:
1) Improvement of O3 in future re-analysis.
2) Better description of O3 sources and sinks in forecasts. This is of particular relevance in stratospheric warmings and the onset of the ozone hole.
3) The production of long term climatologies of ozone and other species.

For more details, please refer to the latest progress report.

Additional information

Project started in 2000.

Allocation of resources for 2002:

HPC: 3,000 units

DHS: 4 Gbytes