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首页> 外文期刊>Environmental Science & Technology >Resolving the Long-Term Trends of Polycyclic Aromatic Hydrocarbons in the Canadian Arctic Atmosphere
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Resolving the Long-Term Trends of Polycyclic Aromatic Hydrocarbons in the Canadian Arctic Atmosphere

机译：解决加拿大北极大气中多环芳烃的长期趋势

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摘要

Polycyclic aromatic hydrocarbon (PAH)air concentrations measured over the period 1992-2000 at the Canadian High Arctic station of Alert were subject to time-series analysis using dynamic harmonic regression (DHR).For most of the PAHs,the DHR model fit to the observed data was good,with DHR capable of interpolating over missing data points during periods when air concentrations were below detection limits.As expected,DHR identified seasonal increases in PAH air concentrations.However,it has also identified additional,subtler "seasonal"patterns as a series of harmonics with varying periodicity.For example,a regular summer high in air concentrations was apparent for many PAHs,particularly the lower molecular weight (two-to three-ringed)compounds,which may be attributed to summertime regional combustion events such as forest fires and/or revolatilization from surfaces (e.g.,soil and oceans,as well as arctic surfaces).Comparison of wintertime PAH concentrations (where SIGMA PAH ranged from 260 to 516 pg m~(-3))with an earlier arctic study did not reveal a reduction in PAH levels.However,removal of the seasonal components by DHR revealed a declining trend in PAH concentrations over the 1992-2000 period.For many lighter PAHs,this was typified by a linear decrease over the whole time series,although,for the higher molecular weight PAHs,a marked reduction was apparent in the first few years of sampling followed by a leveling off in concentrations by the mid/late-1990s.This behavior is similar to reported trends of other air pollutants in the Arctic,may be attributed to the decline in Soviet industry during the early 1990s,and has implications regarding the major PAH sources affecting the Arctic.
机译：使用动态谐波回归（DHR）对加拿大高北极警报站1992-2000年期间测得的多环芳烃（PAH）空气浓度进行时间序列分析。对于大多数PAH，DHR模型适合于观察到的数据很好，DHR能够在空气浓度低于检测极限的时间内对缺失的数据点进行插值。正如预期的那样，DHR确定了PAH空气浓度的季节性增加。但是，它还发现了其他更精细的“季节性”模式一系列周期性变化的谐波。例如，对于许多PAH来说，夏季空气浓度明显很高，尤其是分子量较低（二至三环）的化合物，这可能归因于夏季局部燃烧事件，例如森林火灾和/或表面（例如，土壤和海洋以及北极表面）的挥发。冬季PAH浓度的比较（SIGMA PAH为在早期的北极研究中发现260至516 pg m〜（-3））并未显示PAH含量降低。但是，DHR去除了季节性成分后，发现1992-2000年期间PAH浓度呈下降趋势。较轻的PAHs在整个时间序列中均呈线性下降的趋势，尽管对于较高分子量的PAHs，在采样的最初几年中明显降低了，随后中/晚期浓度趋于稳定。 1990年代。这种行为与报道的北极其他空气污染物的趋势相似，可能归因于1990年代初期苏联工业的衰落，并且对影响北极的主要多环芳烃来源产生了影响。

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  • 来源
    《Environmental Science & Technology》 |2006年第10期|p.3217-3222|共6页
  • 作者

    SARA BECKER; CRISPIN J.HALSALL; SARA BECKER; WLODEK TYCH; HAYLEY HUN;

  • 作者单位

    Environmental Science Department,Lancaster Environment Centre,Lancaster University,Lancaster LA1 4YQ,United Kingdom,Meteorological Services of Canada,4905 Dufferin Street,Downsview,Ontario,Canada M3H 5T4,Air Zone,2240 Speakman Drive,Mississauga,Ontar;

    Environmental Science Department,Lancaster Environment Centre,Lancaster University,Lancaster LA1 4YQ,United Kingdom,Meteorological Services of Canada,4905 Dufferin Street,Downsview,Ontario,Canada M3H 5T4,Air Zone,2240 Speakman Drive,Mississauga,Ontar;

    Environmental Science Department,Lancaster Environment Centre,Lancaster University,Lancaster LA1 4YQ,United Kingdom,Meteorological Services of Canada,4905 Dufferin Street,Downsview,Ontario,Canada M3H 5T4,Air Zone,2240 Speakman Drive,Mississauga,Ontar;

    Environmental Science Department,Lancaster Environment Centre,Lancaster University,Lancaster LA1 4YQ,United Kingdom,Meteorological Services of Canada,4905 Dufferin Street,Downsview,Ontario,Canada M3H 5T4,Air Zone,2240 Speakman Drive,Mississauga,Ontar;

    Environmental Science Department,Lancaster Environment Centre,Lancaster University,Lancaster LA1 4YQ,United Kingdom,Meteorological Services of Canada,4905 Dufferin Street,Downsview,Ontario,Canada M3H 5T4,Air Zone,2240 Speakman Drive,Mississauga,Ontar;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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