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Satellite isoprene retrievals constrain emissions and atmospheric oxidation

机译：卫星异戊二烯检索限制排放和大气氧化

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摘要

Isoprene is the dominant non-methane organic compound emitted to the atmosphere~(1-3). It drives ozone and aerosol production, modulates atmospheric oxidation and interacts with the global nitrogen cycle~(4-8). Isoprene emissions are highly uncertain~(1,9), as is the nonlinear chemistry coupling isoprene and the hydroxyl radical, OH-its primary sink~(10-13). Here we present global isoprene measurements taken from space using the Cross-track Infrared Sounder. Together with observations of formaldehyde, an isoprene oxidation product, these measurements provide constraints on isoprene emissions and atmospheric oxidation. We find that the isoprene-formaldehyde relationships measured from space are broadly consistent with the current understanding of isoprene-OH chemistry, with no indication of missing OH recycling at low nitrogen oxide concentrations. We analyse these datasets over four global isoprene hotspots in relation to model predictions, and present a quantification of isoprene emissions based directly on satellite measurements of isoprene itself. A major discrepancy emerges over Amazonia, where current underestimates of natural nitrogen oxide emissions bias modelled OH and hence isoprene. Over southern Africa, we find that a prominent isoprene hotspot is missing from bottom-up predictions. A multi-year analysis sheds light on interannual isoprene variability, and suggests the influence of the El Niño/Southern Oscillation.
机译：异戊二烯是发射到大气中的主要非甲烷有机化合物〜（1-3）。它推动臭氧和气溶胶生产，调节大气氧化并与全局氮循环相互作用〜（4-8）。异戊二烯排放是高度不确定〜（1,9），也是非线性化学偶联异戊二烯和羟基，oh-其初级水池〜（10-13）。在这里，我们使用交叉轨道红外发声器从空间取出全球异戊二烯测量。与甲醛，异戊二烯氧化产物的观察结果一起，这些测量提供了异戊二烯排放和大气氧化的约束。我们发现从空间测量的异戊二烯 - 甲醛关系与目前对异戊二烯-OH化学的理解广泛一致，在低氧化物浓度下没有缺失OH回收的缺失。我们在与模型预测相关的四个全球异戊二烯热点上分析了这些数据集，并直接呈现基于异戊二烯本身的卫星测量的异戊二烯排放量。亚马逊的主要差异出现，其中目前低估了天然氮氧化物排放偏差偏差，因此异戊二烯。在非洲南部，我们发现突出的异戊二烯热点从自下而上的预测中缺失。多年分析揭示了续年异戊二烯变异性，并表明ELNiño/南方振荡的影响。

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  • 来源
    《Nature》 |2020年第7824期|225-233|共9页
  • 作者

    Kelley C Wells; Dylan B Millet; Vivienne H Payne; M Julian Deventer; Kelvin H Bates; Joost A de Gouw; Martin Graus; Carsten Warneke; Armin Wisthaler; Jose D Fuentes;

  • 作者单位

    Department of Soil Water and Climate University of Minnesota St Paul;

    Department of Soil Water and Climate University of Minnesota St Paul;

    Jet Propulsion Laboratory California Institute of Technology;

    Department of Soil Water and Climate University of Minnesota St Paul|Bioclimatology University of Göttingen;

    School of Engineering and Applied Sciences Harvard University;

    Cooperative Institute for Research in Environmental Sciences University of Colorado|Department of Chemistry University of Colorado;

    Department of Atmospheric and Cryogenic Sciences University of Innsbruck;

    Cooperative Institute for Research in Environmental Sciences University of Colorado|NOAA Chemical Sciences Laboratory;

    Institute for Ion Physics and Applied Physics University of Innsbruck|Department of Chemistry University of Oslo;

    Department of Meteorology and Atmospheric Science The Pennsylvania State University;

  • 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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