首页  |  本刊简介  |  编委会  |  投稿须知  |  订阅与联系  |  微信  |  出版道德声明  |  Ei收录本刊数据  |  封面
华山地区PM2.5中无机离子垂直分布特征
摘要点击 2501  全文点击 651  投稿时间:2017-08-06  修订日期:2017-09-18
查看HTML全文 查看全文  查看/发表评论  下载PDF阅读器
中文关键词  华山  PM2.5  无机离子  垂直分布  酸度
英文关键词  Mt. Huashan  PM2.5  water-soluble inorganic ions  vertical distribution  acidity
作者单位E-mail
曹聪 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 中国科学院气溶胶化学与物理重点实验室, 西安 710061
中国科学院大学, 北京 100049 
caocong@ieecas.cn 
王格慧 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 中国科学院气溶胶化学与物理重点实验室, 西安 710061 wanggh@ieecas.cn 
吴灿 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 中国科学院气溶胶化学与物理重点实验室, 西安 710061
中国科学院大学, 北京 100049 
 
李建军 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 中国科学院气溶胶化学与物理重点实验室, 西安 710061  
刘浪 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 中国科学院气溶胶化学与物理重点实验室, 西安 710061
中国科学院大学, 北京 100049 
 
李瑾 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 中国科学院气溶胶化学与物理重点实验室, 西安 710061
中国科学院大学, 北京 100049 
 
余兴 陕西省气象科学研究所, 西安 710014  
中文摘要
      2016年夏季在华山山腰及山脚设两个采样点(垂直高程相差约700 m),运用大流量采样器进行每4 h 1次PM2.5样品采集,对其无机离子进行分析,探讨其浓度、组成、垂直变化、日变化及酸度的特征.结果表明:采样期间,华山山腰及山脚的PM2.5分别为:(46.9±38.2)μg·m-3和(76.0±44.3)μg·m-3,PM2.5中无机离子分别为:(16.6±15.7)μg·m-3和(24.0±15.0)μg·m-3.两个点位无机离子浓度依次为:SO42- > NO3- > NH4+ > Ca2+.SO42-、NO3-、NH4+为主要组分,占华山山腰及山脚大气PM2.5总离子质量浓度的89%和85%.线性回归分析显示:PM2.5中的NH4+在华山山腰主要以(NH42SO4和NH4NO3的形式存在,而在华山山脚主要以NH4HSO4和NH4NO3的形式存在.华山山腰和山脚PM2.5及其离子呈现出不同的日变化特征:山腰在12:00~16:00出现峰值,主要是因为边界层抬升和山谷风输送地表污染物的缘故;山脚则分别在白天08:00~12:00和夜晚00:00~04:00出现双峰值,这主要是由于早高峰交通排放增加和夜间大型载货卡车流量增大所致.利用阴阳离子当量平衡法及ISORROPIA Ⅱ模型进一步探讨了PM2.5酸度特征,结果表明:华山山脚PM2.5的酸度(pH=2.9±2.0)强于山腰(pH=3.2±2.3).
英文摘要
      PM2.5 was simultaneously collected using a high-volume sampler at 4 h intervals from the mountainside and the foot of the mountain in the Mt. Huashan region, inland China, during the summer of 2016, and the samples were analyzed for inorganic ions, to investigate the chemical characteristics and vertical distribution of the fine particles in the region. The results showed that the concentrations of PM2.5 were (46.9±38.2) μg·m-3 and (76.0±44.3) μg·m-3 on the mountainside and at the foot of Mt. Huashan, respectively. The concentrations of inorganic ions in PM2.5 was higher at the foot of the mountain than on the mountainside, with the order of the mass concentrations of the major ionic species being SO42- > NO3- > NH4+ > Ca2+. Among all the inorganic ions, SO42-, NO3-, and NH4+ are the dominant species, accounting for 89% and 85% of the total, on the mountainside and at the foot, respectively. The fine particulate NH4+ existed mostly in the forms of (NH4)2SO4 and NH4NO3 on the mountainside, and in the forms of NH4HSO4 and NH4NO3 at the foot of the mountain. Mass concentrations of PM2.5 and its major components on the mountainside showed clear diurnal variations, with maximums between 12:00-16:00, mainly due to the transport of the pollutants from the ground surface by the planetary boundary layer height variation and the valley breeze. In contrast, the diurnal variations of PM2.5 and its major components at the foot are characterized with two maxima, peaking between 08:00-12:00 in the daytime and 00:00-04:00 in the nighttime, respectively, mainly due to the increased emissions from both the morning rush-hour traffic and the nighttime on-road heavy-duty vehicles. Acidity of the fine particles was estimated by using the equivalent ratio of anions to cations and the thermodynamic equilibrium model ISORROPIA Ⅱ. Both methods showed that the acidity of PM2.5 at the ground surface site is stronger than that on the mountainside in the Mt. Huashan region.

您是第51723734位访客
主办单位:中国科学院生态环境研究中心 单位地址:北京市海淀区双清路18号
电话:010-62941102 邮编:100085 E-mail: hjkx@rcees.ac.cn
本系统由北京勤云科技发展有限公司设计  京ICP备05002858号-2