ISSN:
0956-6163
Source:
Emerald Fulltext Archive Database 1994-2005
Topics:
Medicine
,
Economics
Notes:
Presents the development and implementation of a four-dimensional variational (4D-var) data assimilation technique for a comprehensive Eulerian chemistry-transport model. The method aims at analysing the chemical state of the atmosphere on the basis of trace gas observations with arbitrary distribution in time and space, a chemistry-transport model, and a priori knowledge as available from climatological records or preceding model runs. The model under consideration is the University of Cologne EURAD-CTM2 with the full RADM2 gas phase mechanism. Describes the storage and recalculation strategy of a parallel implementation of the 4D-var method and first experiences of its performance, when model generated data are provided as artificial observations. The problem of pre-scaling the minimization problem is discussed in some detail. It is found that the algorithm is well suited to adapt the model trajectory to the observation data.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1108/09566169910276184
