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首页> 外文期刊>Environmental Science & Technology >Characterizing the Distribution of Methane Sources and Cycling in the Deep Sea via in Situ Stable Isotope Analysis
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Characterizing the Distribution of Methane Sources and Cycling in the Deep Sea via in Situ Stable Isotope Analysis

机译：通过原位稳定同位素分析表征甲烷源在深海中的分布和循环

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摘要

The capacity to make in situ geo-referenced measurements of methane concentration and stable isotopic composition (δ~(13)C_(CH4)) would greatly improve our understanding of the distribution and type of methane sources in the environment, allow refined determination of the extent to which microbial production and consumption contributes to methane cycling, and enable the testing of hypotheses about the sensitivity of methane cycling to changes in environmental conditions. In particular, characterizing biogeochemical methane cycling dynamics in the deep ocean is hampered by a number of challenges, especially in environments where high methane concentrations preclude intact recovery of undisturbed samples. To that end, we have developed an in situ analyzer capable of δ~(13)C_(CH4) measurements in the deep ocean. Here we present data from laboratory and field studies in which we characterize the instrument's analytical capabilities and performance and provide the first in situ stable isotope based characterization of the influence of anaerobic methane oxidation on methane flux from seep sediments. These data illustrate how in situ measurements can permit finer-scale analyses of variations in AOM activity, and facilitate advances in using δ~(13)C_(CH4) and other isotopic systems to interrogate biogeochemical cycles in the deep sea and other remote or challenging environments.
机译：进行甲烷浓度和稳定同位素组成（δ〜（13）C_（CH4））的原位地理参考测量的能力将大大提高我们对环境中甲烷源的分布和类型的了解，可以精确确定甲烷的来源。微生物生产和消费在何种程度上有助于甲烷循环，并能够验证关于甲烷循环对环境条件变化的敏感性的假设。特别是，表征深海中生物地球化学甲烷循环动力学的过程受到许多挑战的阻碍，尤其是在甲烷浓度高而无法原样回收完整样品的环境中。为此，我们开发了一种能够在深海中测量δ〜（13）C_（CH4）的原位分析仪。在这里，我们提供了来自实验室和现场研究的数据，其中我们表征了该仪器的分析能力和性能，并提供了第一个基于原位稳定同位素的表征，以表征厌氧甲烷氧化对渗流沉积物中甲烷通量的影响。这些数据说明了原位测量如何能够对AOM活性变化进行更精细的分析，并促进了使用δ〜（13）C_（CH4）和其他同位素系统探究深海以及其他偏远或挑战性生物地球化学循环的进展环境。

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  • 来源
    《Environmental Science & Technology》 |2013年第3期|1478-1486|共9页
  • 作者

    Scott D. Wankel; Yi-wen Huang; Manish Gupta; Robert Provencal; J. Brian Leen; Andrew Fahrland; Charles Vidoudez; Peter R. Girguis;

  • 作者单位

    Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, United States,Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02540;

    Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, United States,Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139;

    Los Gatos Research, Inc., Mountain View, California 94041, United States;

    Los Gatos Research, Inc., Mountain View, California 94041, United States;

    Los Gatos Research, Inc., Mountain View, California 94041, United States;

    Los Gatos Research, Inc., Mountain View, California 94041, United States;

    Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, United States;

    Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, 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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