郭良辰,付丹红,王咏薇,苗世光. 2019. 北京城市化对一次降雪过程影响的数值模拟研究[J]. 气象学报, (0):-, doi:10.11676/qxxb2019.053
北京城市化对一次降雪过程影响的数值模拟研究
Numerical simulation of urbanization impacts on once snowfall in Beijing area
投稿时间:2019-01-02  修订日期:2019-04-08
DOI:10.11676/qxxb2019.053
中文关键词:  降雪,城市化,降水类型,WRF
英文关键词:Rnowfall, Urbanization, Precipitation  type, WRF
基金项目:北京市科技计划课题(编号:Z151100002115045)和国家国际科技合作专项项目(编号:2015DFA20870)资助
作者单位E-mail
郭良辰 北京城市气象研究院 412430525@qq.com 
付丹红 中国科学院大气物理研究所 fudanhong@mail.iap.ac.cn 
王咏薇 南京信息工程大学大气物理学院 wyw@nuist.edu.cn 
苗世光 北京城市气象研究院 sgmiao@ium.cn 
摘要点击次数: 345
全文下载次数: 247
中文摘要:
      [资料和方法]利用中尺度数值预报模式(Weather Research and Forecast, WRF),[目的]针对2018年3月17日5时至17时(BT)北京地区的一次降雪过程模拟分析了城市化对降雪的主要影响机制。[结果和结论]结果表明:城市化使得北京五环以内降雪量减少,降雨量增加,这主要是由于城市化低层增温效应加强了雪的融化过程,产生混合型降水,距离市中心越近越容易发生混合型降水。城市化对降雪的总降水量和降水的时空分布也存在一定的影响。降水初期,城市化形成的“城市干热岛”效应不利于水汽的水平和垂直输送,不利于云的形成,地面总降水量减小。随着降水过程的发展,部分冰相粒子融化,使近地面水汽增多,“城市热岛效应”的热力抬升作用,有利于水汽的垂直输送和云的发展,部分云滴或水汽抬升进入云中,增强冷云过程,使雪和霰粒子含量增加,地面总降水量增加。城市化产生的“城市效应”对低层大气温度和云微物理过程产生影响,而云微物理过程的非绝热过程又反过来影响低层大气温度和大气层结,影响能量和水汽输送,进而对云和地面降水产生影响。
英文摘要:
      A snowfall in Beijing from 5:00 to 17:00 on March 17, 2018 (BT)were simulated by using Weather Reseach and Forecasting(WRF)to study the main influence mechanism for urbanization on snowfall. Results show that, urbanization in Beijing''s main urban area reduces snowfall and increases rainfall, this is mainly due to the fact that the low-level warming effect strengthens the melting process of snow and produces mixed precipitation. The closer to the city center, the more prone to mixed precipitation. Urbanization also has an impact on the spatial and temporal distribution of total precipitation. In the beginning of precipitation process, the “urban dry heat island” effect formed by urbanization is not conducive to the horizontal and vertical transport of water vapor and the formation of clouds, and the total precipitation reduces. With the development of the precipitation process, some ice phase particles melt and the water vapor in the near-surface layer increases. The thermal uplift effect of the “urban heat island effect” is conducive to the vertical transport of water vapor and the development of clouds. Some clouds or water vapor rises into the cloud and enhances. The cold cloud process increases the formation of snow and graupel particles and increases the total surface precipitation. The “urban effect” generated by urbanization has an impact on low-level atmospheric temperature and cloud microphysical processes. While the non-adiabatic process of the cloud microphysical process affects the lower atmospheric temperature and atmospheric stratification, affecting energy and water vapor transport, which has an impact on cloud and precipitation.
查看全文   查看/发表评论  下载PDF阅读器
分享按钮