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气象:2022,48(9):1153-1161
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基于CatBoost算法的长江中游冬季降水相态预报方法研究
王珊珊,雷彦森,方鸿斌,孟英杰,章翠红,刘文婷,李康丽
(武汉中心气象台,武汉 430074; 湖北省荆门市气象台,荆门 448124)
Method of Winter Precipitation Type Prediction in the Middle Reaches of the Yangtze River Based on CatBoost Algorithm
WANG Shanshan,LEI Yansen,FANG Hongbin,MENG Yingjie,ZHANG Cuihong,LIU Wenting,LI Kangli
(Wuhan Central Meteorological Observatory, Wuhan 430074;Jingmen Meteorological Observatory of Hubei Province, Jingmen 448124)
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投稿时间:2021-10-13    修订日期:2022-04-13
中文摘要: 利用2000—2014年地面观测资料和欧洲中期天气预报中心(ECMWF)ERA5再分析资料,选取表征四类降水相态(雨、雪、雨夹雪、冻雨)的温度、湿度、微物理特征的43个特征量,使用精细地形高度订正,利用CatBoost算法开展长江中游降水相态预报方法研究。结果显示:此方法对雨、雪、冻雨有较好的分类和预报效果。使用精细地形高度预处理后的特征量,能够提高降水相态判别的准确率和空间精细度。雨、雪、冻雨的预报准确率与ECMWF预报产品相比分别提高了9.9%、39.1%、11.1%,但对雨夹雪的改进不明显。
Abstract:Based on the surface observation and ERA5 hourly reanalysis data from 2000 to 2014, 43 factors were selected to characterize the temperature, humidity and microphysical characteristics of four types of precipitation phases (rain, snow, sleet, freezing rain). The objective forecast method of precipitation type in the middle reaches of Yangtze River is studied by using CatBoost algorithm and the fine terrain height pre processing. The results show that this method has good classification and forecast effect for rain, snow and freezing rain. The accuracy and spatial fineness of precipitation type discrimination can be improved by using the fine terrain height pre processing. Compared with the ECMWF prediction, the prediction accuracy of rain, snow and freezing rain has increased by 9.9%, 39.1% and 11.1% respectively, but the improvement of sleet was not obvious.
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基金项目:国家重点研发计划(2018YFE0196000)、中国气象局气象预报业务关键技术发展专项[YBGJXM(2020)3A-08]、中国气象局预报员专项(CMAYBY2019-072)和湖北省气象局重点课题(2019Z01)共同资助
引用文本:
王珊珊,雷彦森,方鸿斌,孟英杰,章翠红,刘文婷,李康丽,2022.基于CatBoost算法的长江中游冬季降水相态预报方法研究[J].气象,48(9):1153-1161.
WANG Shanshan,LEI Yansen,FANG Hongbin,MENG Yingjie,ZHANG Cuihong,LIU Wenting,LI Kangli,2022.Method of Winter Precipitation Type Prediction in the Middle Reaches of the Yangtze River Based on CatBoost Algorithm[J].Meteor Mon,48(9):1153-1161.