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首页> 外文期刊>Environmental Science & Technology >Source Apportionment of Ambient Methane Enhancements in Los Angeles, California, To Evaluate Emission Inventory Estimates
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Source Apportionment of Ambient Methane Enhancements in Los Angeles, California, To Evaluate Emission Inventory Estimates

机译：加利福尼亚州洛杉矶环境甲烷增强的来源分摊，以评估排放清单估算

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Rapid increase in atmospheric methane (CH4) mixing ratios over the past century is attributable to the intensification of human activities. Information on spatially explicit source contributions is needed to develop efficient and cost-effective CH4 emission reduction and mitigation strategies to addresses near-term climate change. This study collected long-term ambient CH4 measurements at Mount Wilson Observatory (MWO) in Los Angeles, California, to estimate the annual CH4 emissions from the portion of Los Angeles County that is within the South Coast Air Basin (SCLA). The measurement-based CH4 emission estimates for SCLA ranged from 3.95 to 4.89 million metric tons (MMT) carbon dioxide equivalent (CO(2)e) per year between 2012 and 2016. Source apportionment of CH4, CO, CO2, and volatile organic compounds (VOCs) measurements were used to evaluate source categories that contributed to ambient CH4 mixing ratio enhancements (Delta CH4) at SCLA between 2014 and 2016. Results suggested Delta CH4 contributions of 56-79% from natural gas sources, 7-31% from landfills, and 4-15% from transportation sources. The SCLA-specific CH4 emission estimate made using a research grade gridded CH4 emission inventory suggested contributions of 47% from natural gas sources and 50% from landfills. Subsequent airborne measurements determined that CH4 emissions from two major CH4 sources in SCLA were significantly smaller in magnitude than previously thought. This study highlights the importance of studying the variabilities of CH4 emissions across California for policy makers and stakeholders alike.
机译：在过去的一个世纪中，大气中甲烷（CH4）混合比的迅速增加归因于人类活动的加剧。需要关于空间明确来源贡献的信息，以开发有效和具有成本效益的CH4减排和缓解战略，以解决近期的气候变化问题。这项研究收集了加利福尼亚洛杉矶的威尔逊山天文台（MWO）的长期环境CH4测量值，以估算洛杉矶县位于南海岸空气盆地（SCLA）内的部分地区的CH4年度排放量。在2012年至2016年之间，SCLA的基于测量的CH4排放估算值介于每年3.95到489万吨二氧化碳当量（CO（2）e）。CH4，CO，CO2和挥发性有机化合物的来源分配（VOC）测量值用于评估在2014年至2016年间促进SCLA环境CH4混合比提高的源类别（Delta CH4）。结果表明，天然气来源中Delta CH4的贡献率为56-79％，垃圾填埋场的贡献为7-31％ ，还有4-15％来自运输渠道。使用研究级网格化CH4排放清单进行的SCLA特定CH4排放估算表明，天然气来源贡献了47％，垃圾填埋场贡献了50％。随后的机载测量确定，来自SCLA中两个主要CH4来源的CH4排放量的幅度明显小于先前的设想。这项研究强调了研究整个加利福尼亚州CH4排放变化对决策者和利益相关者的重要性。

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  • 来源
    《Environmental Science & Technology》 |2019年第6期|2961-2970|共10页
  • 作者

    Kuwayama Toshihiro; Charrier-Klobas Jessica G.; Chen Yanju; Vizenor Nicholas M.; Blake Donald R.; Pongetti Thomas; Conley Stephen A.; Sander Stanley P.; Croes Bart; Herner Jorn D.;

  • 作者单位

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95812 USA;

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95812 USA;

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95812 USA;

    Univ Calif Irvine, 570 Rowland Hall, Irvine, CA 92697 USA;

    Univ Calif Irvine, 570 Rowland Hall, Irvine, CA 92697 USA;

    NASA, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA;

    Sci Aviat, 3335 Airport Rd Suite B, Boulder, CO 80301 USA;

    NASA, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA;

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95812 USA;

    Calif Air Resources Board, 1001 I St, Sacramento, CA 95812 USA;

  • 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);
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