The Impact of Vertical Resolution in the Explicit Numerical Forecasting of Radiation Fog: A Case Study |
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| Authors: | Robert Tardif |
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| Institution: | (1) Department of Atmospheric and Oceanic Sciences, Research Applications Laboratory, National Center for Atmospheric Research, University of Colorado at Boulder, Box 3000, Boulder, CO, 80301, U.S.A |
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| Abstract: | Numerical experiments are performed with a comprehensive one-dimensional boundary layer/fog model to assess the impact of
vertical resolution on explicit model forecasts of an observed fog layer. Two simulations were performed, one using a very
high resolution and another with a vertical grid typical of current high-resolution mesoscale models. Both simulations were
initialized with the same profiles, derived from observations from a fog field experiment. Significant differences in the
onset and evolution of fog were found. The results obtained with the high-resolution simulation are in overall better agreement
with available observations. The cooling rate before the appearance of fog is better represented, while the evolution of the
liquid water content within the fog layer is more realistic. Fog formation is delayed in the low resolution simulation, and
the water content in the fog layer shows large-amplitude oscillations. These results show that the numerical representation
of key thermo-dynamical processes occurring in fog layers is significantly altered by the use of a grid with reduced vertical
resolution. |
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| Keywords: | Radiation fog explicit numerical forecasting vertical resolution |
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