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首页> 外文期刊>Environmental Science & Technology >High Resolution Measurements of Methane and Carbon Dioxide in Surface Waters over a Natural Seep Reveal Dynamics of Dissolved Phase Air-Sea Flux
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High Resolution Measurements of Methane and Carbon Dioxide in Surface Waters over a Natural Seep Reveal Dynamics of Dissolved Phase Air-Sea Flux

机译：天然渗流中地表水中甲烷和二氧化碳的高分辨率测量揭示了溶解相空气-海洋通量的动力学

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摘要

Marine hydrocarbon seeps are sources of methane and carbon dioxide to the ocean, and potentially to the atmosphere, though the magnitude of the fluxes and dynamics of these systems are poorly defined. To better constrain these variables in natural environments, we conducted the first high-resolution measurements of sea surface methane and carbon dioxide concentrations in the massive natural seep field near Coal Oil Point (COP), California. The corresponding high resolution fluxes were calculated, and the total dissolved phase air-sea fluxes over the surveyed plume area (～363 km~2) were 6.66 × 10~4 to 6.71 × 10~4 mol day~(-1) with respect to CH_4 and -6.01 × 10~5 to -5.99 × 10~5 mol day~(-1) with respect to CO_2. The mean and standard deviation of the dissolved phase air-sea fluxes of methane and carbon dioxide from the contour gridding analysis were estimated to be 0.18 ± 0.19 and -1.65 ± 1.23 mmol m~(-2) day~(-1), respectively. This methane flux is consistent with previous, lower-resolution estimates and was used, in part, to conservatively estimate the total area of the dissolved methane plume at 8400 km~2. The influx of carbon dioxide to the surface water refutes the hypothesis that COP seep methane appreciably influences carbon dioxide dynamics. Seeing that the COP seep field is one of the biggest natural seeps, a logical conclusion could be drawn that microbial oxidation of methane from natural seeps is of insufficient magnitude to change the resulting plume area from a sink of atmospheric carbon dioxide to a source.
机译：海洋碳氢化合物的渗漏是甲烷和二氧化碳向海洋乃至大气的甲烷源，尽管这些系统通量和动力学的大小定义不清。为了更好地将这些变量限制在自然环境中，我们对加利福尼亚州煤油点（COP）附近的巨大自然渗流场中的海表甲烷和二氧化碳浓度进行了首次高分辨率测量。计算了相应的高分辨率通量，在被测烟羽面积（〜363 km〜2）上总溶解相海气通量为6.66×10〜4至6.71×10〜4 mol·day〜（-1）相对于CO_2达到CH_4和-6.01×10〜5至-5.99×10〜5 mol·day〜（-1）。等高线网格分析法估计的甲烷和二氧化碳溶解相气海通量的平均偏差和标准偏差分别为0.18±0.19和-1.65±1.23 mmol m〜（-2）天〜（-1） 。该甲烷通量与以前的较低分辨率估算值一致，并部分用于保守地估算8400 km〜2处溶解的甲烷羽流的总面积。二氧化碳涌入地表水反驳了COP渗入甲烷明显影响二氧化碳动力学的假设。鉴于COP渗漏场是最大的自然渗漏之一，可以得出一个合理的结论，即自然渗漏产生的甲烷的微生物氧化作用强度不足以将最终的羽流面积从大气二氧化碳汇聚成一个源。

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  • 来源
    《Environmental Science & Technology》 |2014年第17期|10165-10173|共9页
  • 作者

    Mengran Du; Shari Yvon-Lewis; Fenix Garcia-Tigreros; David L. Valentine; Stephanie D. Mendes; John D. Kessler;

  • 作者单位

    Department of Oceanography, Texas A&M University, College Station, Texas 77843, United States, Department of Marine Chemistry, Ocean University of China, Qingdao 266100, China, Sanya Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China;

    Department of Oceanography, Texas A&M University, College Station, Texas 77843, United States;

    Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, United States;

    Department of Earth Science and Marine Science Institute, University of California, Santa Barbara, California 93106, United States;

    Department of Earth Science and Marine Science Institute, University of California, Santa Barbara, California 93106, United States;

    Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, United States;

  • 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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