Chapter 4 Ice Fog

Chapter 4 Ice Fog AbstractIce fog is a natural, outdoor cloud laboratory that provides an excellent opportunity to study ice microphysical processes. Ice crystals in fog are formed through similar pathways as those in elevated clouds, i.e. cloud condensation or ice nuclei are activated in an atmosphere supersaturated with respect to liquid water or ice. The primary differences between surface and elevated ice clouds are related to the sources of water vapor, the cooling mechanisms and dynamical processes leading to supersaturation and the microphysical characteristics of the nuclei that affect ice fog, crystal physical properties. As with any fog, its presence can be a hazard for ground or airborne traffic due to poor visibility and icing. In addition, ice fog plays a role in climate change by modulating the heat and moisture budgets.Ice fog wintertime occurrence in many parts of the world can have a significant impact on the environment. Global climate models need to accurately account for the temporal and spatial microphysical and optical properties of ice fog, as do weather forecast models. The primary handicap is the lack of adequate information on nucleation processes and microphysical algorithms that accurately represent glaciation of supercooled water fog.This chapter summarizes our current understanding of ice fog formation and evolution, discusses operating principles, limitations and uncertainties associated with the instruments used to measure ice fog microphysical properties, describes the prediction of ice fog by the numerical forecast models and physical parameterizations used in climate models, identifies the outstanding questions to be resolved, and lists recommended actions to address and solve these questions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Meteorological Monographs American Meteorological Society

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Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
0065-9401
D.O.I.
10.1175/AMSMONOGRAPHS-D-17-0002.1
Publisher site
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Abstract

AbstractIce fog is a natural, outdoor cloud laboratory that provides an excellent opportunity to study ice microphysical processes. Ice crystals in fog are formed through similar pathways as those in elevated clouds, i.e. cloud condensation or ice nuclei are activated in an atmosphere supersaturated with respect to liquid water or ice. The primary differences between surface and elevated ice clouds are related to the sources of water vapor, the cooling mechanisms and dynamical processes leading to supersaturation and the microphysical characteristics of the nuclei that affect ice fog, crystal physical properties. As with any fog, its presence can be a hazard for ground or airborne traffic due to poor visibility and icing. In addition, ice fog plays a role in climate change by modulating the heat and moisture budgets.Ice fog wintertime occurrence in many parts of the world can have a significant impact on the environment. Global climate models need to accurately account for the temporal and spatial microphysical and optical properties of ice fog, as do weather forecast models. The primary handicap is the lack of adequate information on nucleation processes and microphysical algorithms that accurately represent glaciation of supercooled water fog.This chapter summarizes our current understanding of ice fog formation and evolution, discusses operating principles, limitations and uncertainties associated with the instruments used to measure ice fog microphysical properties, describes the prediction of ice fog by the numerical forecast models and physical parameterizations used in climate models, identifies the outstanding questions to be resolved, and lists recommended actions to address and solve these questions.

Journal

Meteorological MonographsAmerican Meteorological Society

Published: Aug 25, 2017

References

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