Aircraft Measurements of Icing in Supercooled and Water Droplet/Ice Crystal Clouds

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Abstract
Icing measurements were carried out in Spain during the Precipitation Enhancement Project experiment in 1979, with an instrumented DC-7 aircraft. The energy balance at the riming surface of a cylinder allows the prediction of the ice growth regime (wet or dry) for the present measurements with 85% success. The mixed conditions encountered show that the ice phase plays an important role in the ice accretion process. For a range of temperature from −21 to −8°C, the icing rate appears to be reduced ∼50% by the presence of large ice particles in concentrations above 5 L−1. The proposed explanation is that the ice particles erode the ice deposit formed by the supercooled water. Abstract Icing measurements were carried out in Spain during the Precipitation Enhancement Project experiment in 1979, with an instrumented DC-7 aircraft. The energy balance at the riming surface of a cylinder allows the prediction of the ice growth regime (wet or dry) for the present measurements with 85% success. The mixed conditions encountered show that the ice phase plays an important role in the ice accretion process. For a range of temperature from −21 to −8°C, the icing rate appears to be reduced ∼50% by the presence of large ice particles in concentrations above 5 L−1. The proposed explanation is that the ice particles erode the ice deposit formed by the supercooled water.

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