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Assimilation Techniques: 4dVar
April 2001
By Mike Fisher
European Centre for Medium-Range Weather
Forecasts.
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1 . Introduction
This lecture has two aims. The first aim is to describe the differences between the ECMWF 4dVar and 3dVar analysis systems, and to summarize the main features of the current ECMWF operational configuration of 4dVar. (The reader is referred to Rabier et al. 2000, Mahfouf and Rabier 2000, and Klinker et al. 2000 for a more complete description of the ECMWF 4dVar.)
The second aim is to demonstrate the way in which 4dVar responds to observational data by considering the increments generated by a single isolated observation.
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06.06.2002 |
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