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首页> 外文学位 >Oxidized organic functional groups in aerosol particles from forest emissions measured at mid-mountain and high-elevation mountain sites in Whistler, BC.
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Oxidized organic functional groups in aerosol particles from forest emissions measured at mid-mountain and high-elevation mountain sites in Whistler, BC.

机译：在不列颠哥伦比亚省惠斯勒的中山和高海拔山区，对森林排放的气溶胶颗粒中的氧化有机官能团进行了测量。

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摘要

Aerosols contribute to the largest uncertainty in climate prediction (IPCC, 2007) from both direct and indirect radiative forcing these effects are influenced by particle size and chemistry. Although organic compounds constitute a large part of aerosols, this fraction is poorly characterized. In an effort to address the complexity of organic aerosols, aerosol particles were collected in Whistler, British Columbia, at a mid-mountain site in spring 2008 and a peak site in spring and summer 2009. The organic functional group composition of the collected aerosol was measured by Fourier transform infrared (FTIR) spectroscopy. At the mid-mountain site the organic mass (OM) project mean was 1.3 +/- 1.0 mug m-3. On average, organic hydroxyl, alkane, and carboxylic acid groups represented 34%, 33%, and 23% of OM, respectively. Positive matrix factorization (PMF) analysis, which was employed with complementary elemental characterization, attributed 65% of the campaign OM to biogenic sources. The functional group composition of the biogenic factor was similar to that of secondary organic aerosol (SOA) reported from the oxidation of biogenic volatile organic compounds (BVOCs) in laboratory chamber studies, providing evidence that the magnitude and chemical composition of biogenic SOA simulated in the laboratory is similar to that found in actual atmospheric conditions. At the mountain peak site the OM project mean for all samples was 3.2 +/- 3.3 mug m-3 and reached a maximum of 13.6 mug m-3 during severe wildfires. Both burning and non-burning forest emissions contributed to the significant ketone groups measured.
机译：气溶胶是直接和间接辐射强迫对气候预测的最大不确定性（IPCC，2007），这些影响受粒径和化学性质的影响。尽管有机化合物占了气溶胶的很大一部分，但该部分的表征却很差。为了解决有机气溶胶的复杂性，在不列颠哥伦比亚省的惠斯勒，于2008年春季在山的中部站点和在2009年春季和夏季的高峰站点收集了气溶胶颗粒。收集到的气溶胶的有机官能团组成为用傅立叶变换红外（FTIR）光谱仪测量。在山的中部，有机质（OM）的平均值为1.3 +/- 1.0马克杯m-3。平均而言，有机羟基，烷烃和羧酸基团分别占OM的34％，33％和23％。正矩阵分解（PMF）分析与互补元素表征一起使用，将运动OM的65％归因于生物源。生物因子的官能团组成类似于实验室室内研究中生物挥发性有机化合物（BVOC）氧化报告的次级有机气溶胶（SOA）的组成，提供了证据证明在实验室模拟的生物SOA的大小和化学组成。实验室与实际大气条件下的实验室相似。在山峰现场，所有样品的OM项目平均值为3.2 +/- 3.3马克杯m-3，在严重野火期间最大达到13.6马克杯m-3。燃烧的和不燃烧的森林排放物都是所测量的重要酮类。

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  • 作者

    Schwartz, Rachel E.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Atmospheric Chemistry.
  • 学位 M.S.
  • 年度 2010
  • 页码 100 p.
  • 总页数 100
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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