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However, generally there is an improvement in forecast 2m temperatures.  But at times the analysed temperature structure of the boundary layer may only move a small way towards correcting errors in the background (Fig9.2.1-71).  From a mathematical standpoint it is also (unfortunately!) more difficult to correctly assimilate data near the surface than data higher up.

Fig9.2.1-71: Examples of the difficulty of assimilating temperature and humidity data in the lowest layers.

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