马新成,董晓波,毕凯. 2021. 北京海坨山区低槽降雪云系演变特征的观测研究[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.029
北京海坨山区低槽降雪云系演变特征的观测研究
Ma Xincheng,Dong Xiaobo,Bi Kai, Wen Dian,Chen Yunbo,Chen Yicheng,Mai Rong
投稿时间:2020-09-01  修订日期:2021-02-01
DOI:10.11676/qxxb2021.029
中文关键词:  降雪,雪花显微观测,海坨山,冬奥会,北京
英文关键词:Snow, Snowflake  micro observation, Haituo  mountain, Winter  Olympics, Beijing
基金项目:国家重点研发计划
作者单位邮编
马新成 北京市人工影响天气办公室 100089
董晓波 河北省人工影响天气办公室 050020
毕凯 北京市人工影响天气办公室 100089
摘要点击次数: 162
全文下载次数: 124
中文摘要:
      2019年2月14日在北京延庆地区,出现了一次由低槽云系产成的降雪过程。本文利用飞机、Ka波段云雷达、微波辐射计、降水粒子谱仪、雪晶显微观测仪等协同观测数据集,分析了此次降雪过程天气形势、中尺度和微观结构的演变特征。结果显示:(1)降雪过程由高空低槽和地面倒槽槽前西南暖湿气流与低层东风回流干冷偏东风共同影响形成,西南风厚度和强度与地面降雪量以及降雪粒子数浓度正相关。(2)降雪云系为冰云,地面降雪形状主要为片状、枝状和柱状单晶体,冰雪晶的凝华-聚并增长是降雪的主要形成机制。(3)大量枝状雪花的攀附现象出现在地形云爬升阶段,即低层东风回流减弱,转由倒槽槽前西南暖湿气流控制。(4)过冷水的出现与地形抬升有关,地形云爬升期间存在人工增雪潜力。
英文摘要:
      A typical snow case during a low trough controlled weather system was measured in Yanqing competition area of Beijing Winter Olympics on Feb 14th, 2019.The data from aircraft, Ka-band cloud radar, microwave radiometer, hydrometeor, snow shape detector provided unique datasets that were used to analyze the evolution of synoptic situation, meso- and microscale structures associated with variations in surrounding conditions. The result shows: (1) the snow was formed by the combination of warm wet wind flow from southwest in front of low Trough and inverted trough at high level and cold dry east wind flow of the low layer. The thickness and strengthen of southwest wind layer has a positive relationship with snowfall and concentration of snow particles. (2)The snow cloud are consist of ice particles and the main snowflakes shapes are plate, dendritic, columns.The main formation mechanism of snowflakes growing are sublimation and coalescence.(3)a considerable dendritic aggregated snowflakes were found in the lifting of orographic snow clouds. In this situation ,the weather was controlled by warm flow which came from southwest with large humidity in front of inverted trough(4)the appears of super-cooled liquid water related well with the lifting by the topography, during which a good potential exist for snow enhancement.
查看全文   查看/发表评论  下载PDF阅读器
分享按钮