Abstract
Forecasting and modelling fog formation, development, and dissipation is a significant challenge. Fog dynamics involve subtle interactions between small‐scale turbulence, radiative transfer and microphysics. Recent studies have highlighted the role of aerosol and related cloud microphysical properties in the evolution of fog. In this article, we investigate this role using very high‐resolution large eddy simulations coupled with a newly developed multi‐moment cloud microphysics scheme (CASIM), which has been designed to model aerosol–cloud interactions. The simulation results demonstrate the sensitivity of the fog structure to the properties of the aerosol population (e.g. number concentration). This study also demonstrates the importance of the treatment of aerosol activation in fog formation and discusses future work required to improve the representation of aerosol–fog interactions for simulations of fog.
Highlights
Dearden C, Hill A, Coe H et al 2018
Aviation and marine transport, with asso- condense onto cloud condensation nuclei (CCN) to form fog droplets This study aims to understand the role ciated economic losses that are compara- and a thin fog layer
This study focuses on the influence of aerosols on the formation of nocturnal radiation fog
Summary
Cloud AeroSol Interactive Microphysics (CASIM) SOCRATES (Edwards and Slingo, 1996). resolution. A surface temperature as shown in Figure 2(c) and a surface vapour mixing ratio of 0.004kgkg−1 were both prescribed based on observations. The chosen radius is the default value for MONC and is primarily motivated by observations of the effective radius within cumulus clouds (Blyth and Latham, 1991). This value may not be suitable for simulations of fog, investigating the effective radius was outside the scope of this work. The simulated visibility at a 2m height in T. control drops under 1km at 1700 utc, indicating the formation of fog an hour prior to observations, where it continues to decrease and eventually converges to around 160m. List of tests referred to throughout this study, which includes changes in aerosol properties
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