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Open AccessArticle

Why Does Fog Deepen? An Analytical Perspective

Department of Geoscience and Remote Sensing, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
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Atmosphere 2020, 11(8), 865; https://doi.org/10.3390/atmos11080865
Received: 24 April 2020 / Revised: 12 August 2020 / Accepted: 13 August 2020 / Published: 14 August 2020
(This article belongs to the Special Issue Observation, Simulation and Predictability of Fog )
The overall depth of a fog layer is one of the important factors in determining the hazard that a fog event presents. With discrete observations and often coarse numerical grids, however, fog depth cannot always be accurately determined. To address this, we derive a simple analytical relation that describes the change in depth of a fog interface with time, which depends on the tendencies and vertical gradients of moisture. We also present a lengthscale estimate for the maximum depth over which mixing can occur in order for the fog layer to be sustained, assuming a uniform mixing of the vertical profiles of temperature and moisture. Even over several hours, and when coarse observational resolution is used, the analytical description is shown to accurately diagnose the depth of a fog layer when compared against observational data and the results of large-eddy simulations. Such an analytical description not only enables the estimation of sub-grid or inter-observation fog depth, but also provides a simple framework for interpreting the evolution of a fog layer in time. View Full-Text
Keywords: analytical model; boundary-layer; fog; fog dynamics; large-eddy simulation; observations analytical model; boundary-layer; fog; fog dynamics; large-eddy simulation; observations
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Izett, J.G.; van de Wiel, B.J.H. Why Does Fog Deepen? An Analytical Perspective. Atmosphere 2020, 11, 865.

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