Improving the representation of stable boundary layers
Sandu, Irina ; Beljaars, Anton ; Balsamo, Gianpaolo
Année de publication
2014
A revision of the parametrization of turbulent diffusion (or vertical mixing) in stable conditions was recently implemented in cycle 40r1 (November 2013) of the Integrated Forecasting System (IFS). This revision has been combined with changes to the representation of surface drag (or friction) in regions with orography and to the strength of the heat exchange between the land surface and the atmosphere. This set of changes improves the forecasts of near-surface winds in stable boundary layers, but also leads to better forecasts of the large-scale circulation patterns during autumn and winter in the northern hemisphere.
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