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首页> 外文期刊>Geo-Marine Letters >A method for the calculation of anaerobic oxidation of methane rates across regional scales: an example from the Belt Seas and The Sound (North Sea–Baltic Sea transition)
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A method for the calculation of anaerobic oxidation of methane rates across regional scales: an example from the Belt Seas and The Sound (North Sea–Baltic Sea transition)

机译：一种跨区域尺度的甲烷厌氧氧化率计算方法：以“一带海”和“海峡”（北海-波罗的海过渡带）为例

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Estimating the amount of methane in the seafloor globally as well as the flux of methane from sediments toward the ocean–atmosphere system are important considerations in both geological and climate sciences. Nevertheless, global estimates of methane inventories and rates of methane production and consumption through anaerobic oxidation in marine sediments are very poorly constrained. Tools for regionally assessing methane formation and consumption rates would greatly increase our understanding of the spatial heterogeneity of the methane cycle as well as help constrain the global methane budget. In this article, an algorithm for calculating methane consumption rates in the inner shelf is applied to the gas-rich sediments of the Belt Seas and The Sound (North Sea–Baltic Sea transition). It is based on the depth of free gas determined by hydroacoustic techniques and the local methane solubility concentration. Due to the continuous nature of shipboard hydroacoustic measurements, this algorithm captures spatial heterogeneities in methane fluxes better than geochemical analyses of point sources such as observational/sampling stations. The sensibility of the algorithm with respect to the resolution of the free gas depth measurements (2 m vs. 50 cm) is proven of minor importance (a discrepancy of <10%) for a small part of the study area. The algorithm-derived anaerobic methane oxidation rates compare well with previous measured and modeling studies. Finally, regional results reveal that contemporary anaerobic methane oxidation in worldwide inner-shelf sediments may be an order of magnitude lower (ca. 0.24 Tmol year–1) than previous estimates (4.6 Tmol year–1). These algorithms ultimately help improve regional estimates of anaerobic oxidation of methane rates.
机译：在地质和气候科学中，估算全球海底甲烷的量以及甲烷从沉积物向海洋-大气系统的通量是重要的考虑因素。尽管如此，对海洋沉积物的甲烷清单以及甲烷通过厌氧氧化产生甲烷和消耗速率的全球估算受到的约束非常有限。用于区域性评估甲烷形成和消耗速率的工具将极大地增进我们对甲烷循环空间异质性的了解，并有助于限制全球甲烷预算。在本文中，将一种计算内层架甲烷消耗率的算法应用于“一带海”和“海峡”（北海-波罗的海过渡带）的富含气体的沉积物。它基于通过水声技术确定的游离气体深度和局部甲烷溶解度浓度。由于船上水声测量的连续性，该算法比点/观测站等点源的地球化学分析更好地捕获了甲烷通量中的空间异质性。对于小部分研究区域，该算法相对于自由气体深度测量分辨率（2m vs.50cm）的敏感性被证明具有次要的重要性（差异<10％）。该算法得出的厌氧甲烷氧化速率与先前的测量和建模研究比较良好。最后，区域结果表明，当今世界范围内内架沉积物中的厌氧甲烷氧化可能比先前的估计值（4.6 Tmol年-1）低一个数量级（约0.24 Tmol年-1）。这些算法最终有助于改善甲烷速率厌氧氧化的区域估计。

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  • 来源
    《Geo-Marine Letters》 |2013年第4期|299-310|共12页
  • 作者

    José M. Mogollón; Andrew W. Dale; Jørn B. Jensen; Michael Schlüter; Pierre Regnier;

  • 作者单位

    Department of Geosciences Utrecht University">(1);

    Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung">(4);

    Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR)">(2);

    Geological Survey of Denmark and Greenland (GEUS)">(3);

    Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung">(4);

    Département des Sciences de la Terre et de l’Environnement Université Libre de Bruxelles">(5);

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