Overview of data assimilation developments in NWP centres
Aperçu des développements en assimilation des données dans les centres de prévision numérique du temps
Rabier F.
Recent data assimilation developments which have taken place at
numerical weather-prediction centres are briefly discussed, from the <br>perspectives of both the importance of data and algorithmic <br>developments. The increase in quality and quantity of satellite data is <br>seen to play a major role in the improvement of forecast performance, <br>particularly in the southern hemisphere. Further optimization of the use<br> of observations is possible through the proper evaluation of data <br>impact and the optimization of the amount of data to be assimilated. The<br> generalized advent of four-dimensional variational assimilation is <br>presented, and trends in the specification of error statistics are <br>described. Finally, a more interactive forecasting system including an <br>adaptive component is a new challenge to bring additional improvement to<br> the forecasting of high-impact weather.
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