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首页> 外文期刊>Atmospheric chemistry and physics >Source apportionment of methane and nitrous oxide in California's San Joaquin Valley at CalNex 2010 via positive matrix factorization
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Source apportionment of methane and nitrous oxide in California's San Joaquin Valley at CalNex 2010 via positive matrix factorization

机译：通过阳性矩阵分解在Calnex 2010的加州San Joaquin Valley在加利福尼亚州的San Joaquin Valley的源分摊

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摘要

Sources of methane (CH4) and nitrous oxide (N2O) were investigated using measurements from a site in southeast Bakersfield as part of the CalNex (California at the Nexus of Air Quality and Climate Change) experiment from mid-May to the end of June 2010. Typical daily minimum mixing ratios of CH4 and N2O were higher than daily minima that were simultaneously observed at a mid-oceanic background station (NOAA, Mauna Loa) by approximately 70 ppb and 0.5 ppb, respectively. Substantial enhancements of CH4 and N2O (hourly averages > 500 and > 7 ppb, respectively) were routinely observed, suggesting the presence of large regional sources. Collocated measurements of carbon monoxide (CO) and a range of volatile organic compounds (VOCs) (e.g., straight-chain and branched alkanes, cycloalkanes, chlorinated alkanes, aromatics, alcohols, isoprene, terpenes and ketones) were used with a positive matrix factorization (PMF) source apportionment method to estimate the contribution of regional sources to observed enhancements of CH4 and N2O.
机译：使用Southteast Bakersfield中的部位的测量来研究甲烷（CH 4）和氧化亚氮（N 2 O）的来源，作为Calnex（加利福尼亚州的空气质量和气候变化的Nexus）的一部分，从5月中旬到2010年6月底。CH4和N2O的典型日最小混合比率高于在中海底站（NOAA，MAUNA LOA）的每日最小值，分别约70ppb和0.5ppb。常规观察CH4和N2O（每小时平均> 500和> 7ppb）的显着增强，表明存在大型区域来源。用阳性基质分解，使用一氧化碳（CO）和一系列挥发性有机化合物（例如，直链和支链烷烃，环烷烃，氯化烷烃，芳烃，醇，异戊二烯，萜烯和酮）。 （PMF）源分摊方法估算区域来源对CH4和N2O增强的贡献。

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