United States Department of Transportation
i
The In-Cloud Icing and Large-Drop Experiment Science and Operations Plan
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2021-11-01
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[PDF-11.34 MB]
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Alternative Title:The In-Cloud Icing and Large-Drop Experiment (ICICLE) Science and Operations Plan [cover title]
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Edition:Final Report
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Abstract:This document provides an in-depth description of the scientific and technical objectives of, and the operations planning for “ICICLE” (the In-Cloud Icing and Large-drop Experiment). ICICLE was conducted between late January and early March of 2019 in an effort to: 1) further advance the understanding of meteorological processes related to the production and depletion of supercooled liquid water, with an emphasis on supercooled large drops (SLD), and; 2) evaluate and refine icing tools that can be used to diagnose, forecast and differentiate between icing and non-icing conditions. Such tools are either currently operational in the en-route domain or being considered as part of a new capability under development for the terminal area domain. Both will allow users to make informed, icing-relevant decisions for flight operations. To accomplish these goals, data from icing tools will be compared to research-quality data collected both in flight and on the ground. The National Research Council of Canada’s heavily-instrumented Convair-580 research aircraft captured essential observations in icing and adjacent non-icing conditions across Michigan, Indiana, Illinois, Iowa, Wisconsin, and the adjacent Great Lakes over more than 110 hours of flight. Simultaneously, data from operational sources such as National Weather Service surface stations, radars and satellites were collected and supplemented by data from five ground-based suites of instruments and four weather balloon sites across the ICICLE domain. In-depth analysis and rigorous statistical verification are planned, which will result in the development and refinement of those tools and their application for operations, providing enhanced icing information to the aviation community for years to come.
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