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KMID : 1024520170260070827
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Journal of the Environmental Sciences
2017 Volume.26 No. 7 p.827 ~ p.836
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A Case Study on Meteorological Analysis of Freezing Rain and Black Ice Formation on the Load at Winter
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Park Geun-Yeong
Lee Soon-Hwan
Kim Eun-Ji
Yun Byeong-Yeong
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Abstract
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Freezing rain is a phenomenon when precipitation falls as a liquid rain drop, but freezes when it comes into contact with surfaces or objects. In this study, we investigated the predictability of freezing rain and its characteristics, which are strongly related with the occurrence of black ice using synoptic scale meteorological observation data. Two different cases occurred at 2012 were analyzed and in the presented cases, freezing rain often occurs in the low-level low pressure with the warm front. The warm front due to the lower cyclone make suitable environment in which snow falling from the upper layer can change into supercooled water. The 0oC temperature line to generate supercooling water is located at an altitude of 850 hPa in the vertical temperature distribution. And the ground temperature remained below zero, as is commonly known as a condition for black ice formation. It is confirmed that the formation rate of freezing rain is higher when the thickness after 1000-850 hPa is 1290-1310 m and the thickness of 850-700 hPa layer is larger than 1540 m in both cases. It can also be used to predict and estimate the generation of freezing rain by detecting and analyzing bright bands in radar observation.
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KEYWORD
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Freezing rain, Black ice, Synoptic analysis, Case study, Ice formation
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