Improved Parameterized Scheme of Ramer Algorithm and Simulation of Icing in China
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Abstract:
Wire icing has a significant influence on the development of the national economy. We analyzed the temporal and spatial distribution of freezing rain and rime using the field observation data of 1276 sites from 1995 to 2017 in China. We divided the research region into two areas: the freezing rain area mainly in the southern China, such as YunnanGuizhou Plateau, Hunan and Jiangxi, and the rime area mainly in the northern China, such as the northern Henan,North China, the northern Xinjiang and Northeast China Plain. Freezing weather is mainly in winter, most of which happens in January. Based on suitable meteorological factor thresholds of freezing rain and rime, we improved the parameterized scheme of the Ramer algorithm, and used the ingredientsbased methodology to forecast rime. Comparing simulation and observation through a practical case, the missing forecast rate was significantly decreasing from 06 in original scheme to 0.31 in the improved scheme, and TS score which indicated the accuracy of the forecast increased sharply from 037 to 058.The range of rime simulation using the ingredientsbased methodology was highly consistent with observation of rime. It shows that this method has higher ability to forecast rime weather, which provides a new approach for the exploration of icing.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.