南京青奥会期间不同天气条件下大气气溶胶中水溶性离子的分布特征

发布时间：2018-01-09 04:21

本文关键词：南京青奥会期间不同天气条件下大气气溶胶中水溶性离子的分布特征　出处：《环境科学》2016年12期 　论文类型：期刊论文

【摘要】：为研究青奥会期间不同天气条件下水溶性离子粒径分布特征,使用β射线测尘仪、安德森9级采样器和IC型离子色谱分析仪对南京2014-08-06~2014-09-04的PM_(2.5)、水溶性离子进行观测分析.将观测期间划分为晴天、雨天和阴天这3种天气类型.PM_(2.5)在不同天气条件下的平均浓度为晴天阴天雨天.PM_(1.1)、PM_(1.1~2.1)和PM_(2.1~10)中水溶性离子的浓度均是晴天阴天雨天,且降雨过程对细粒子的去除作用更为明显.Ca~(2+)和Mg~(2+)谱分布类似,呈双峰分布,降雨对SO_4~(2-)和NH_4~+在0.65~1.1μm清除作用较强.不同天气条件下NO_3~-/SO_4~(2-)比值均小于1,雨天和阴天时的NO-3/SO_4~(2-)值高于晴天.3种天气条件下SOR和NOR的值均大于0.1,SO_2和NO_2发生不同程度的二次转化,大气中存在更多的二次颗粒物.
[Abstract]:In order to study the particle size distribution of water-soluble ions in different weather conditions during the Olympic Games, a 尾 -ray dust detector was used. Andersen class 9 sampler and IC ion chromatographic analyzer were used to study the PMSP of 2014-08-06An 2014-09-04 in Nanjing. Water soluble ions were observed and analyzed. The observation period was divided into sunny days. The average concentration of the three types of weather in different weather conditions is sunny, cloudy and rainy. The concentrations of water soluble ions in PM1. 1 and PM2. 1 + 10) were cloudy and rainy on sunny days. The precipitation process has a more obvious effect on the removal of fine particles. The distribution of the spectra is similar to that of Mg~(2), showing a bimodal distribution. Rainfall has a strong scavenging effect on so _ 4 ~ (2 ~) and NH _ 4 ~ at 0.65 ~ (1.1 渭 m). The ratio of no _ 3 / S _ 4 / S _ 4 ~ (2) is less than 1 under different weather conditions. The values of NO-3 / so _ 4 / so _ 4 in rainy and overcast weather were higher than those of SOR and NOR in sunny weather. SO_2 and NO_2 have different degrees of secondary transformation, and there are more secondary particles in the atmosphere.
【作者单位】：南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室;
【基金】：国家自然科学基金项目(41305135,91544229) 中国科学院战略先导科技专项(B类)项目(XDB05020206) 江苏省高校‘青蓝工程’项目江苏省江苏高校优势学科建设工程项目(PAPD)
【分类号】：X513
【正文快照】： 近年来,随着我国经济的快速发展和工业化水平的迅速提高,城市人口及机动车数量的急增,大气气溶胶污染已成为我国目前面临的最严峻的环境问题之一[1].大气气溶胶粒子的大小、状态、组成和运动方式的不同决定了气溶胶的污染特征以及对环境和人类健康的影响程度[2].水溶性离子作

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