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首页> 外文期刊>Atmospheric chemistry and physics >Chemical characterization and sources of submicron aerosols in the northeastern Qinghai–Tibet Plateau: insights from high-resolution mass spectrometry
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Chemical characterization and sources of submicron aerosols in the northeastern Qinghai–Tibet Plateau: insights from high-resolution mass spectrometry

机译：青藏高原东北地区亚微粒气溶胶的化学特征与源极：高分辨率质谱中的见解

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摘要

An Aerodyne high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) was deployed along with other online instruments to study the highly time resolved chemistry and sources of submicron aerosols (PM1) at Waliguan (WLG) Baseline Observatory, a highaltitude (3816ma.s.l.) background station located at the northeast edge of the Qinghai–Tibet Plateau (QTP), during 1–31 July 2017. The average PM1 mass concentration during this study was 9.1 μgm~(-3) (ranging from 0.3 to 28.1 μgm~(-3)), which was distinctly higher than those (2.0– 5.7 μgm~(-3)) measured with the Aerodyne AMS at other high-elevation sites in the southern or central QTP. Sulfate showed a dominant contribution (38.1 %) to PM1 at WLG followed by organics (34.5 %), ammonium (15.2 %), nitrate (8.1 %), BC (3.0 %) and chloride (1.1 %). Accordingly, bulk aerosols appeared to be slightly acidic throughout this study, mainly related to the enhanced sulfate contribution. All chemical species peaked at the accumulation mode, indicating the well-mixed and highly aged aerosol particles at WLG from long-range transport. Positive matrix factorization (PMF) on the high-resolution organic mass spectra resolved four distinct organic aerosol (OA) components, including a traffic-related hydrocarbon-like OA (HOA), a relatively fresh biomass burning OA (BBOA), an aged biomass burning OA (agBBOA) and a more-oxidized oxygenated OA (OOA). On average, the two relatively oxidized OAs, OOA and agBBOA, contributed 34.4% and 40.4% of organics, respectively, while the rest were 18.4% for BBOA and 6.8% for HOA. Source analysis for air masses showed that higher mass concentrations of PM1 and enhanced contributions of sulfate and biomass-burning-related OA components (agBBOA C BBOA) were from the northeast of the WLG with shorter transport distance, whereas lower PM1 mass concentrations with enhanced OOA contribution were from the west after long-range transport, suggesting their distinct aerosol sources and significant i
机译：随着其他在线仪器，部署了Aerodyne高分辨率飞行时间的飞行时间气溶胶质谱仪（HR-TOF-AMS），以研究Waliguan（WLG）基线天文台的高度时间解决的化学和亚微粒气溶胶的来源（PM1），在2017年7月1日至31日，位于青藏高原（QTP）东北缘的高度高度（3816mA.SL）背景站。本研究期间的平均PM1质量浓度为9.1μgm〜（-3）（范围0.3至28.1μgm〜（-3）），明显高于南部或中央QTP中其他高升高场的Aerodyne AMS测量的（2.0-5.7μgm〜（-3））。硫酸盐显示出在WLG的PM1中的显性贡献（38.1％），然后有机物（34.5％），铵（15.2％），硝酸铵（8.1％），Bc（3.0％）和氯（1.1％）。因此，散装气溶胶似乎在本研究中略微酸性，主要与增强的硫酸盐贡献有关。所有化学物质均以累积模式达到峰值，从远程运输中表明WLG的良好混合和高度老化的气溶胶颗粒。高分辨率有机质谱上的正矩阵分解（PMF）分解了四种不同的有机气溶胶（OA）组分，包括与交通相关的烃类OA（HOA），相对新的生物量燃烧OA（BboA），一种老化的生物质燃烧的OA（agbboa）和更氧化的含氧OA（OOA）。平均而言，两种相对氧化的OAS，OOA和AgBBOA，分别贡献了34.4％和40.4％的有机物，而其余的BboA为18.4％，HOA为6.8％。气体源分析表明，较高的PM1和增强的硫酸盐和生物质燃烧相关的OA组分（AgBboa C BboA）的源于较短的运输距离，而具有较短的运输距离，而且具有增强的OOA的PM1质量浓度降低在远程运输后，贡献来自西方，暗示他们独特的气溶胶来源和重要的我

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  • 来源
    《Atmospheric chemistry and physics》 |2019年第2期|共15页
  • 作者

    Xinghua Zhang; Jianzhong Xu; Shichang Kang; Qi Zhang; Junying Sun;

  • 作者单位

    State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China;

    State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China;

    State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China;

    Department of Environmental Toxicology University of California Davis CA 95616 USA;

    Chinese Academy of Meteorological Sciences China Meteorological Administration Beijing 100081 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
  • 关键词

    other online instruments; the Aerodyne AMS; the southern or central;

    机译：其他在线乐器;Aerodyne AMS;南方或中央;

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