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北京山区和平原地区夏季雨滴谱特征分析
赵城城1, 张乐坚2
(1.潍坊市气象局;2.中国气象局气象探测中心)
Microphypical Characteristics of the Raindrop Size Distribution between Mountain and Plain Areas over Beijing during Summer
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投稿时间:2020-01-13    修订日期:2020-10-20
中文摘要: 山区和平原地区降水的雨滴谱特征由于下垫面等因素的影响有时存在较大地差别,分析两者的差异有助于能够深入理解降雨的特征。利用2017-2018年北京地区夏季雨滴谱站和自动站资料,选取延庆站和大兴站代表北京山区和平原地区,通过降水分类方法研究了两站不同降水类型雨滴谱分布的特征。 结果表明,北京地区夏季主要以小雨强降水为主,但对流性降水贡献主要雨量。两站平均谱均为单峰结构,Gamma分布能够较好的拟合平均谱结构。不同降水类型相比,对流性降水比层状云降水具有更大的Dm、LgNw和分布谱宽(SD);两站相比,延庆站的不同降水类型的Dm(LgNw)均大于(小于)大兴站,表明北京山区滴谱粒径偏大数浓度偏低;山区(平原)对流滴谱倾向于大陆性(海洋性)对流。分析了Dm- R关系、LgNw-R关系、μ(谱型)-Λ(斜率)关系和Z-R关系,经典Z-R关系Z=300R1.4对两站拟合效果都较好,表明此关系比较适用于北京地区。
Abstract:Due to the influence of underlying surface and other factors, the raindrop size distribution characteristics of rainfall in mountainous and plain areas sometimes have great differences. The analysis of the differences between them is helpful to understand the characteristics of rainfall in depth. Based on the raindrop spectrum data from laser optical disdrometer and rainfall data from automatic station over Beijing in the summer of 2017 and 2018, the representative mountain area Yanqing station and plain area Daxing station were selected. The raindrop size distribution characteristics of convective and stratiform rain types at two stations were studied by rain type classification method. The results show that the summer rainfall in Beijing area is mainly weak rainfall, but convective rain contributed to the main rainfall. The composite spectra of two stations are both single peak structure, and Gamma distribution fit the composite spectra well. Compared with different rain types, convective rain spectra has larger Dm, LgNw and distribution spectrum width (SD) than stratiform rain spectra. Compared with the two stations, the Dm (LgNw) of different rain types at Yanqing Station is larger than (less than) that of Daxing Station, indicating that the mountain area raindrop size is larger while number concentration is lower; the convective rain spectrum at mountain (plain) area is more inclined to the continental (maritime) convective. The relationship between Dm-R, LgNw-R, μ(shape)-Λ (slope)and Z-R were also analyzed . The standard Z-R relation Z=300R1.4has good fitting effect for both stations, which indicates that this relation is suitable for Beijing area.
文章编号:202001130014     中图分类号:    文献标志码:
基金项目:国家重点基础研究发展计划(973计划)
引用文本:
赵城城,张乐坚,0.[en_title][J].Meteor Mon,():-.
Zhao Chengcheng,Zhang Lejian,0.Microphypical Characteristics of the Raindrop Size Distribution between Mountain and Plain Areas over Beijing during Summer[J].Meteor Mon,():-.