河南省一次冻雨过程中电线积冰厚度模拟  

Simulation of Wire Ice Thickness During a Freezing Rain Process in Henan Province

作　　者：杜骦 周宁 韩永翔[1] 李哲 陆正奇 龚建福[1] 刘唯佳[1] DU Shuang;ZHOU Ning;HAN Yongxiang;LI Zhe;LU Zhengqi;GONG Jianfu;LIU Weijia(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Key Laboratory for Aerosol-Cloud-Precipitation of CMA,Nanjing University of Information Science and Technology,Nanjing 210044;Electric Power Research Institute State Grid Henan Electric Power,Company Zhengzhou 450018)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,中国气象局气溶胶-云-降水重点开放实验室,南京210044 [2]国网河南省电力公司电力科学研究院,郑州450018

出　　处：《气象》2019年第5期641-650,共10页Meteorological Monthly

基　　金：国家自然科学基金项目(41375158)资助

摘　　要：利用WRF中尺度数值模式并耦合Jones积冰厚度模型,对河南省2010年2月8-11日的冻雨过程进行了大气环流分析以及电线积冰厚度的模拟。研究结果显示:(1)在河南大部和安徽北部,冷暖气团在此交汇且出现强逆温层,满足了冻雨产生的天气条件:(2)模拟的降水场和10 m高度风向风速均与观测相当,但模拟降水中心强度略大:(3)模拟电线积冰在地面温度低于0℃时出现并快速增长。在积冰增长及维持阶段,垂直方向温度与水合物的模拟结果显示高低空配置与积冰厚度的变化趋势相吻合。积冰首先出现在伏牛山以北地区,随时间推移,积冰向伏牛山外围的东南部扩展。模拟的范围和积冰厚度演变大体上与观测值吻合,证明该模式可用于河南地区的积冰预测。(4)部分地区仍存在积冰厚度模拟值偏大的现象,其原因可能来自地形模拟精度较粗、模拟风速偏大、风向与电线夹角理想化以及Jones积冰模型阈值范围较小等因素,这表明耦合了Jones积冰厚度的WRF模式虽然有一定的模拟能力,但仍需要进一步改进。The atmospheric circulation analysis and ice thickness simulation are conducted to the freezing rain process in Henan Province in 8-11 February 2010 by using the Weather Research and Forecasting(WRF)mesoscale numerical model coupled with the Jones ice thickness model.The results show that:(1)The emergence of an intense inversion layer and the mixing of cold and warm air masses above Henan and northern Anhui reached the freezing weather conditions.(2)The simulated precipitation and 10 m wind direction and wind speed were similar to the observed values,but the intensity of the simulated precipitation center was slightly larger.(3)The simulated wire ice accretion appeared and developed rapidly when the surface temperature went below 0℃.In the icing growth and maintenance phase,the vertical temperature and hydrate simulation results show that the height and low altitude configuration is consistent with the change trend of ice thickness.Ice accretion first appeared to the north of Funiu Mountain,and then extended to the southeast.The evolution of the simulated ice range and the thickness of the wire ice accretion generally coincided with the observed data,which proves that this model can be applied to the prediction of ice accumulation in Henan Province.(4)The simulated ice thickness was too large in some areas,which might be attributed to many reasons,for example,as simulation demands highly accurate terrain data,the simulated wind speed is too large,the angle between the wind direction and the electric wire is ideally assumed,and the threshold range of the Jones ice model is narrowed.Although the WRF model of ice thickness has some capability in the simulation of wire ice accretion,it still needs further improvement.

关 键 词：电线积冰厚度 WRF模式 中尺度模拟 覆冰增长模型 

分 类 号：P426[天文地球—大气科学及气象学] P49