Quantification of methane emission from bacterial mat sites at Quepos Slide offshore Costa Rica

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• 作者：Deniz Karaca ; Tina Schleicher ; Christian Hensen…
• 关键词：Methane ; Fluid seepage ; Submarine landslide ; Central American margin ; Reactive ; transport modeling ; Bacterial mats
• 刊名：International Journal of Earth Sciences
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：103
• 期：7
• 页码：1817-1829
• 全文大小：8,875 KB
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• 作者单位：Deniz Karaca (1)
  Tina Schleicher (2)
  Christian Hensen (1) (3)
  Peter Linke (1) (3)
  Klaus Wallmann (1) (3)
  
  1. Collaborative Research Center (SFB) 574, GEOMAR, Helmholz Centre for Ocean Research Kiel, Wischhofstra?e 1-3, 24148, Kiel, Germany
  2. Department of Bioinformatics, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
  3. Helmholtz Centre for Ocean Research Kiel (GEOMAR), Wischhofstra?e 1-3, 24148, Kiel, Germany
  
• ISSN：1437-3262

文摘

Seafloor methane emission from the Quepos Slide on the submarine segment of the Costa Rica fore-arc margin was estimated by extrapolating flux measurements from individual seeps to the total area covered by bacterial mats. This approach is based on the combination of detailed mapping to determine the abundance of seeps and the application of a numerical model to estimate the amount of benthic methane fluxes. Model results suggest that the majority of the studied seeps transport rather limited amount of methane (on average: ~177?μmol?cm??a?) into the water column due to moderate upward advection, allowing for intense anaerobic oxidation of methane (AOM; on average: 53?% of the methane flux is consumed). Depth-integrated AOM rates (56-,538?μmol CH4 cm??a?) are comparable with values reported from other active seep sites. The overall amount of dissolved methane released into the water column from the entire area covered by bacterial mats on the Quepos Slide is estimated to be about 0.28?×?106?mol?a?. This conservative estimate which relies on rather accurate determinations of seafloor methane fluxes emphasizes the potential importance of submarine slides as sites of natural methane seepage; however, at present the global extent of methane seepage from submarine slides is largely unknown.