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首页> 外文期刊>Environmental Science & Technology >Concentrations and Photochemistry of Acetaldehyde, Glyoxal, and Methylglyoxal in the Northwest Atlantic Ocean
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Concentrations and Photochemistry of Acetaldehyde, Glyoxal, and Methylglyoxal in the Northwest Atlantic Ocean

机译：西北大西洋中乙醛，乙二醛和甲基乙二醛的浓度和光化学

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摘要

The photochemical production and degradation of acetaldehyde, glyoxal, and methylglyoxal along with spatiotemporal variations in their concentrations were investigated in the Northwest Atlantic Ocean from September to October 2016. Surface seawater concentrations did not exhibit day-night differences and ranged from 1.0-7.1, 1.4-4.8, and 0.25-2.8 nmol L-1 for acetaldehyde, glyoxal, and methylglyoxal, respectively. Higher glyoxal and methylglyoxal concentrations were observed in biologically productive seawater from Georges Bank and coastal Rhode Island compared to the oligotrophic Sargasso Sea, whereas no differences were seen in acetaldehyde concentrations among these stations. Carbonyl photoproduction rates in surface seawater ranged from 0.35-0.79, 0.06-0.2, and 0.02-0.07 nmol L-1 h(-1) for acetaldehyde, glyoxal, and methylglyoxal, respectively. Methylglyoxal slowly photodegraded in seawater (similar to 0.001-0.03 nmol L(-1)h(-1)), whereas acetaldehyde and glyoxal were photochemically stable. Photochemical sources explained from similar to 7 to 53% of the estimated total production of acetaldehyde in the surface mixed layer; a similar estimate could not be determined for glyoxal or methylglyoxal, since several processes have not been quantified that potentially affect their concentrations. Our results suggest that acetaldehyde is likely supersaturated in surface seawater relative to its typical atmospheric concentrations, whereas glyoxal and methylglyoxal are significantly undersaturated.
机译：研究了西北大西洋从2016年9月至2016年10月乙醛，乙二醛和甲基乙二醛的光化学产生和降解以及它们的浓度时空变化。地表海水浓度没有表现出昼夜差异，范围为1.0-7.1、1.4乙醛，乙二醛和甲基乙二醛分别为-4.8和0.25-2.8 nmol L-1。与贫营养的马尾藻海相比，在乔治银行和罗得岛州沿海的生物生产海水中发现较高的乙二醛和甲基乙二醛浓度，而在这些站之间乙醛浓度没有差异。乙醛，乙二醛和甲基乙二醛的表面海水中羰基的光生产率分别为0.35-0.79、0.06-0.2和0.02-0.07 nmol L-1 h（-1）。甲基乙二醛在海水中缓慢光降解（类似于0.001-0.03 nmol L（-1）h（-1）），而乙醛和乙二醛在光化学上稳定。光化学来源解释了表面混合层中乙醛估计总产量的约7％至53％；无法确定乙二醛或甲基乙二醛的类似估算值，因为尚未量化可能影响其浓度的几种方法。我们的结果表明，相对于其典型的大气浓度，乙醛在地表海水中可能会过饱和，而乙二醛和甲基乙二醛则明显不饱和。

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  • 来源
    《Environmental Science & Technology》 |2019年第16期|9512-9521|共10页
  • 作者

    Zhu Yuting; Kieber David J.;

  • 作者单位

    SUNY Coll Environm Sci & Forestry Dept Chem 1 Forestry Dr Syracuse NY 13210 USA|New York State Dept Hlth Wadsworth Ctr Albany NY 12201 USA;

    SUNY Coll Environm Sci & Forestry Dept Chem 1 Forestry Dr Syracuse NY 13210 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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