...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric chemistry and physics >Photochemical age of air pollutants, ozone, and secondary organic aerosol in transboundary air observed on Fukue Island, Nagasaki, Japan
【24h】

Photochemical age of air pollutants, ozone, and secondary organic aerosol in transboundary air observed on Fukue Island, Nagasaki, Japan

机译：在日本长崎福江岛观察到的跨界空气中的空气污染物，臭氧和次要有机气溶胶的光化学年龄

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To better understand the secondary air pollution in transboundary air over westernmost Japan, ground-based field measurements of the chemical composition of fine particulate matter (a parts per thousand currency signaEuro parts per thousand aEuro-1aEuro-A mu m), mixing ratios of trace gas species (CO, O-3, NOx, NOy, i-pentane, toluene, and ethyne), and meteorological elements were conducted with a suite of instrumentation. The CO mixing ratio dependence on wind direction showed that there was no significant influence from primary emission sources near the monitoring site, indicating long- and/or mid-range transport of the measured chemical species. Despite the considerably different atmospheric lifetimes of NOy and CO, these mixing ratios were correlated (r(2) = 0.67). The photochemical age of the pollutants, t[OH] (the reaction time x the mean concentration of OH radical during the atmospheric transport), was calculated from both the NO(x)aEuro-a center dot aEuro-NOy concentration ratio (NO(x)aEuro-a center dot aEuro-NOy clock) and the tolueneaEuro-a center dot aEuro-ethyne concentration ratio (hydrocarbon clock). It was found that the tolueneaEuro-/aEuro-ethyne concentration ratio was significantly influenced by dilution with background air containing 0.16aEuro-ppbv of ethyne, causing significant bias in the estimation of t[OH]. In contrast, the influence of the reaction of NOx with O-3, a potentially biasing reaction channel on [NOx]aEuro-/aEuro-[NOy], was small. The t[OH] values obtained with the NO(x)aEuro-a center dot aEuro-NOy clock ranged from 2.9aEuro-aEuro parts per thousand x aEuro-10(5) to 1.3aEuro-aEuro parts per thousand x aEuro-10(8)aEuro-haEuro-moleculeaEuro-cm(-3) and were compared with the fractional contribution of the ma center dot z 44 signal to the total signal in the organic aerosol mass spectra (f(44), a quantitative oxidation indicator of carboxylic acids) and O-3 mixing ratio. The comparison of t[OH] with f(44) showed evidence for a systematic increase of f(44) as t[OH] increased, an indication of secondary organic aerosol (SOA) formation. To a first approximation, the f(44) increase rate was (1.05aEuro-A +/- aEuro-0.03)aEuro-aEuro parts per thousand x aEuro-10(-9)aEuro-aEuro parts per thousand x aEuro-[OH]aEuro-h(-1), which is comparable to the background-corrected increase rate observed during the New England Air Quality Study in summer 2002. The similarity may imply the production of similar SOA component, possibly humic-like substances. Meanwhile, the comparison of t[OH] with O-3 mixing ratio showed that there was a strong proportional relationship between O-3 mixing ratio and t[OH]. A first approximation gave the increasing rate and background mixing ratio of ozone as (3.48aEuro-A +/- aEuro-0.06)aEuro-aEuro parts per thousand x aEuro-10(-7)aEuro-aEuro parts per thousand x aEuro-[OH]aEuro-ppbv h(-1) and 30.7aEuro-ppbv, respectively. The information given here can be used for prediction of secondary pollution magnitude in the outflow from the Asian continent.
机译：为了更好地了解日本最西端的跨界空气中的二次空气污染，对细颗粒物的化学成分（千分之一欧元的欧元百万分之一欧元-1aEuro-A微米）的地面实地测量，痕量混合比气体种类（CO，O-3，NOx，NOy，异戊烷，甲苯和乙炔）和气象元素均通过一套仪器进行了测量。 CO混合比对风向的依赖性表明，监测地点附近的主要排放源没有显着影响，表明所测化学物质的远距离和/或中距离传输。尽管NOy和CO的大气寿命存在很大差异，但这些混合比还是相关的（r（2）= 0.67）。污染物的光化学年龄t [OH]（反应时间x大气中运输过程中OH自由基的平均浓度）是根据NO（x）aEuro-a中心点aEuro-NOy浓度比（NO（ x）一个欧洲-一个中心点一个欧洲-NOy时钟）和甲苯-一个欧洲-一个中心点一个欧洲-乙炔浓度比（碳氢化合物时钟）。结果发现，甲苯在含有0.16aEuro-ppbv乙炔的背景空气中稀释会显着影响甲苯Euro // aEuro-乙炔的浓度比，从而导致t [OH]的估算存在明显偏差。相比之下，NOx与O-3的反应的影响较小，O-3是[NOx] aEuro- / aEuro- [NOy]的潜在偏向反应通道。使用NO（x）aEuro-a中心点aEuro-NOy时钟获得的t [OH]值范围为2.9aEuro-aEuro千分之一x aEuro-10（5）到1.3aEuro-aEuro千分之一x aEuro-10 （8）aEuro-haEuro分子Euro-cm（-3），并与有机气溶胶质谱图中的ma中心点z 44信号对总信号的分数贡献进行了比较（f（44），这是定量的氧化指标羧酸）和O-3的混合比例。 t [OH]与f（44）的比较表明，随着t [OH]的增加，f（44）有系统地增加，这表明形成了次级有机气溶胶（SOA）。初步估算，f（44）的增长率为（1.05aEuro-A +/- +/- aEuro-0.03）aEuro-aEuro千分之一x aEuro-10（-9）aEuro-aEuro千分之一x aEuro- [OH ] aEuro-h（-1），与在2002年夏季进行的新英格兰空气质量研究中观察到的经背景校正的增长率相当。相似性可能暗示了类似SOA组分（可能是腐殖质类物质）的产生。同时，t [OH]与O-3混合比的比较表明，O-3混合比与t [OH]之间存在很强的比例关系。一阶近似值给出了臭氧的增加速率和背景混合比，即（3.48aEuro-A +/- aEuro-0.06）aEuro-aEuro千分之一x aEuro-10（-7）aEuro-aEuro千分之一x aEuro- [ OH] aEuro-ppbv h（-1）和30.7aEuro-ppbv分别。此处提供的信息可用于预测亚洲大陆流出的二次污染程度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号