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Impact of OA on the Temperature Dependence of PM 2.5 in the Los Angeles Basin

机译：OA对洛杉矶盆地PM 2.5温度依赖的影响

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摘要

Air quality policy in the Los Angeles megacity is a guidepost for other megacities. Over the last 2 decades, the policy has substantially reduced aerosol (OA) concentrations and the frequency of high aerosol events in the region. During this time, the emissions contributing to, and the temperature associated with, high aerosol events have changed. Early in the record, aerosol concentrations responded to a variety of different sources. We show that emission control has been effective with a strong decrease in temperature-independent sources. As a result, the response of aerosol to temperature has become a dominant feature of high aerosol events in the basin. The organic fraction of the aerosol (OA) increases with the temperature approaching 35% at 40 °C. We describe a simple conceptual model of aerosol in Los Angeles, illustrating how benzene, toluene, ethylbenzene, and xylenes (BTEX) and isoprene, along with molecules for which these are plausible surrogates such as monoterpenes, are sufficient to explain the observed temperature dependence of PM 2.5.
机译：洛杉矶的空气质量政策是其他巨石的指南。在过去的二十年中，该政策大大降低了气溶胶（OA）浓度和该地区高气溶胶事件的频率。在此期间，贡献的排放以及与高气溶胶事件相关的温度发生了变化。在记录中，气溶胶浓度应对各种不同来源。我们表明排放控制有效地有着强烈的无差异来源的源。结果，气溶胶对温度的响应已成为盆地高气溶胶事件的主导特征。气溶胶（OA）的有机级分，随着40℃的温度接近35％而增加。我们描述了洛杉矶气溶胶的简单概念模型，说明了苯，甲苯，乙苯和二甲苯（BTEX）和异戊二烯以及它们是诸如单波通的可粘性替代品的分子，足以解释观察到的温度依赖性PM 2.5。

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  • 来源
    《Environmental Science & Technology》 |2021年第6期|3549-3558|共10页
  • 作者

    Clara M. Nussbaumer; Ronald C. Cohen;

  • 作者单位

    Department of Chemistry University of California Berkeley Berkeley California 94720 United States;

    Department of Chemistry University of California Berkeley Berkeley California 94720 United States;

  • 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
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