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Fatima Karbou, Elisabeth Gérard, and Florence Rabier

increase the correlations between the observations and simulations of the window channels. The improvement is very large over snow-covered areas. Regarding the assimilated data, we have noticed an important increase in the amount of assimilated AMSU observations over land when using one of the three land emissivity methods. The increase in the number of assimilated observations does not degrade the global statistics of the departures from the first guess and from analysis. The performance levels of the

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Sen Chiao and Gregory S. Jenkins

, version 2.2.1 ( Michalakes et al. 2005 ). Two nested domains, as shown in Fig. 3 , were constructed with grid spacings of 25- and 5-km horizontal resolution, respectively. The vertical limit of the model was located at the 50-hPa level, and time steps of 60 and 10 s were used in these nested grid simulations, respectively. The 25-km resolution domain covered part of western Africa and the eastern Atlantic (2°–24°N and 31°W–4°E) and the inner domain covers the Guinea Highlands and the extreme eastern

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