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气象:2018,44(7):929-935
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关中颗粒物粒径谱特征及其气象影响因子分析
李星敏,陈闯,董自鹏,董妍,杜川利,彭艳
(陕西省气象科学研究所,西安 710014)
Analysis of the Impact of Meteorological Factors on Particle Size Distribution and Its Characteristic over Guanzhong Basin
LI Xingmin,CHEN Chuang,DONG Zipeng,DONG Yan,DU Chuanli,PENG Yan
(Meteorological Institute of Shaanxi Province, Xi’an 710014)
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投稿时间:2017-01-12    修订日期:2018-05-23
中文摘要: 利用西安泾河和长安的气象观测资料、陕西秦岭大气科学试验基地气溶胶粒子谱观测资料及西安市环境保护局颗粒物质量浓度观测资料,分析了气象条件对关中颗粒物粒径谱的影响,结果表明:关中特殊的地形影响和严重的颗粒物污染是霾易发的主要原因;混合层高度与PM2.5质量浓度具有较明显的负相关关系,秋、冬季混合层高度高有利于颗粒物污染的扩散。不同方向上风速变化对颗粒物浓度的影响体现了西北气流对关中颗粒物污染的扩散作用和偏东气流对颗粒物污染的输送。高相对湿度有利于稳定层结的维持和污染物集聚,当相对湿度≤80%时,粒径在150 nm~1.0 μm的粒子的数浓度,随着相对湿度的增大明显增加,对降低能见度、形成雾 霾有重要作用。不同粒径段粒子的数浓度随相对湿度的变化不同,对能见度的影响也不同;相对湿度越大,湿度对降低能见度的贡献越大。
Abstract:The impact of meteorological factors on particle size distribution and its characteristic over Guanzhong Basin (GZB) was studied by employing the particulate matter (PM) mass concentration data released by Xi’an Environmental Protection Bureau, the meteorological station data and the particle size distribution data measured by aerodynamic particle sizer (APS) and Scanning Mobility Particle Sizer Model 3034 (SMPS). The result showed that heavy haze frequently occurring in GZB is mainly caused by complex special terrain and high levels of particulate pollutants. Significant negative correlations were found between planetary boundary layer height (PBLH) and mass concentrations of PM with aerodynamic diameters <2.5 μm (PM2.5), suggesting that a higher PBLH is favorable for the diffusion of particulate pollutants. Changes in PM2.5 in response to wind speed and wind direction was simultaneously investigated, clearly showing that easterly (northwesterly) wind is associated with the import (export) of pollutants to (from) GBZ. Furthermore, high relative humidity significantly contributes to the maintenance of stable atmospheric boundary layers and the accumulation of particulate pollutants. When relative humidity (RH) is less then 80%, the particle number concentration with diameters ranging from 150 nm to 1.0 μm increases greatly with the increase of RH, which could result in a poor visibility. The number concentration of particles within different size ranges changes variously with RH, causing different impacts on visibility. The higher the RH, the larger the contribution of humidity to the visibility reduction.
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基金项目:国家自然科学基金项目(41375155)资助
引用文本:
李星敏,陈闯,董自鹏,董妍,杜川利,彭艳,2018.关中颗粒物粒径谱特征及其气象影响因子分析[J].气象,44(7):929-935.
LI Xingmin,CHEN Chuang,DONG Zipeng,DONG Yan,DU Chuanli,PENG Yan,2018.Analysis of the Impact of Meteorological Factors on Particle Size Distribution and Its Characteristic over Guanzhong Basin[J].Meteor Mon,44(7):929-935.