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首页> 外文期刊>Atmospheric chemistry and physics >Toward consistency between trends in bottom-up CO2 emissions and top-down atmospheric measurements in the Los Angeles megacity
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Toward consistency between trends in bottom-up CO2 emissions and top-down atmospheric measurements in the Los Angeles megacity

机译：朝着洛杉矶巨大的自下而上的二氧化碳排放趋势与自上而下的大气测量之间的一致性

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摘要

Large urban emissions of greenhouse gases result in large atmospheric enhancements relative to background that are easily measured. Using CO2 mole fractions and delta C-14 and delta C-13 values of CO2 in the Los Angeles megacity observed in inland Pasadena (2006-2013) and coastal Palos Verdes peninsula (autumn 2009-2013), we have determined time series for CO2 contributions from fossil fuel combustion (C-ff) for both sites and broken those down into contributions from petroleum and/or gasoline and natural gas burning for Pasadena. We find a 10 % reduction in Pasadena C-ff during the Great Recession of 2008-2010, which is consistent with the bottom-up inventory determined by the California Air Resources Board. The isotopic variations and total atmospheric CO2 from our observations are used to infer seasonality of natural gas and petroleum combustion. The trend of CO2 contributions to the atmosphere from natural gas combustion is out of phase with the seasonal cycle of total natural gas combustion seasonal patterns in bottom-up inventories but is consistent with the seasonality of natural gas usage by the area's electricity generating power plants. For petroleum, the inferred seasonality of CO2 contributions from burning petroleum is delayed by several months relative to usage indicated by statewide gasoline taxes. Using the high-resolution Hestia-LA data product to compare C-ff from parts of the basin sampled by winds at different times of year, we find that variations in observed fossil fuel CO2 reflect seasonal variations in wind direction. The seasonality of the local CO2 excess from fossil fuel combustion along the coast, on Palos Verdes peninsula, is higher in autumn and winter than spring and summer, almost completely out of phase with that from Pasadena, also because of the annual variations of winds in the region. Variations in fossil fuel CO2 signals are consistent with sampling the bottom-up Hestia-LA fossil CO2 emissions product for sub-city source regions in the LA megacity domain when wind directions are considered.
机译：温室气体的大型城市排放导致相对于易于测量的背景的大气增强。在洛杉矶（2006-2013）（2006-2013）（2006-2013）（2009-2013秋季）中观察到的洛杉矶特征在洛杉矶的洛杉矶巨型点（2009-2013）（2009-2013秋季），使用CO2摩尔分数和Delta C-13值。来自化石燃料燃烧（C-FF）的贡献，适用于两家地点，并将这些贡献分解为石油和/或汽油和天然气为帕萨迪纳燃烧的贡献。我们在2008 - 2010年的巨大衰退期间发现帕萨迪纳C-FF减少了10％，这与加州空气资源委员会确定的自下而上库存一致。我们观察结果的同位素变异和总大气二氧化碳用于推断天然气和石油燃烧的季节性。来自天然气燃烧的二氧化碳贡献的趋势与自然天然气燃烧季节性图案的季节性循环不相位，但与该地区电力发电厂的天然气使用的季节性一致。对于石油，燃烧石油的二氧化碳贡献的推断季节性相对于全态汽油税指出的使用延迟了数月。使用高分辨率Hestia-LA数据产品将C-FF从一年中的盆中采集的盆地部分比较，发现观察到的化石燃料二氧化碳的变化反映了风向的季节变化。来自普洛斯verdes半岛的化石燃料燃烧的当地二氧化碳季节的季节性在秋冬比春天和夏天更高，几乎完全超出了帕萨迪纳的阶段，也因为随着风的年度变化该区域。化石燃料CO2信号的变化与在考虑风向时对La Megacity域的子城市源区的自下而上的Hestia-La Fossil CO2排放产品一致。

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  • 来源
    《Atmospheric chemistry and physics》 |2016年第6期|共21页
  • 作者

    Newman Sally; Xu Xiaomei; Gurney Kevin R.; Hsu Ying Kuang; Li King Fai; Jiang Xun; Keeling Ralph; Feng Sha; OKeefe Darragh; Patarasuk Risa; Wong Kam Weng; Rao Preeti; Fischer Marc L.; Yung Yuk L.;

  • 作者单位

    CALTECH Dept Geol &

    Planetary Sci Pasadena CA 91125 USA;

    Univ Calif Irvine Dept Earth Syst Sci Irvine CA 92697 USA;

    Arizona State Univ Sch Life Sci Tempe AZ 85287 USA;

    Air Resources Board Monitoring &

    Lab Div Sacramento CA 95811 USA;

    Univ Washington Dept Appl Math Seattle WA 98195 USA;

    Univ Houston Dept Earth &

    Atmospher Sci Houston TX 77004 USA;

    Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92037 USA;

    CALTECH Jet Prop Lab Earth Atmospher Sci 4800 Oak Grove Dr Pasadena CA 91109 USA;

    Arizona State Univ Sch Life Sci Tempe AZ 85287 USA;

    Arizona State Univ Sch Life Sci Tempe AZ 85287 USA;

    CALTECH Jet Prop Lab Earth Atmospher Sci 4800 Oak Grove Dr Pasadena CA 91109 USA;

    CALTECH Jet Prop Lab Earth Atmospher Sci 4800 Oak Grove Dr Pasadena CA 91109 USA;

    EO Lawrence Berkeley Natl Lab Environm Energy Area Berkeley CA 94720 USA;

    CALTECH Dept Geol &

    Planetary Sci Pasadena CA 91125 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 大气科学（气象学）;
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