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https://doi.org/10.5194/bg-2015-533
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bg-2015-533
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Preprints
22 Feb 2016
 | 22 Feb 2016
Status: this preprint was under review for the journal BG. A revision for further review has not been submitted.

Rates and pathways of CH4 oxidation in ferruginous Lake Matano, Indonesia

A. Sturm, D. A. Fowle, C. Jones, K. Leslie, S. Nomosatryo, C. Henny, D. E. Canfield, and S. A. Crowe

Abstract. This study evaluates rates and pathways of methane (CH4) oxidation and uptake using 14C-based tracer experiments throughout the oxic and anoxic waters of ferruginous Lake Matano. Methane oxidation rates in Lake Matano are low compared to other lakes, but are sufficiently high to preclude strong CH4 fluxes to the atmosphere. In addition to aerobic CH4 oxidation, which takes place in Lake Matano's oxic mixolimnion, we also detected CH4 oxidation in Lake Matano's anoxic ferruginous waters. Here, CH4 oxidation proceeds in the apparent absence of oxygen (O2) and instead appears to be coupled to nitrate (NO3−), nitrite (NO2−), iron (Fe), or manganese (Mn) reduction. Throughout the lake, the fraction of CH4 carbon that is assimilated vs. oxidized to carbon dioxide (CO2) is high, indicating extensive CH4 conversion to biomass and underscoring the importance of CH4 as a carbon and energy source in Lake Matano and potentially other ferruginous or low productivity environments.

How to cite. Sturm, A., Fowle, D. A., Jones, C., Leslie, K., Nomosatryo, S., Henny, C., Canfield, D. E., and Crowe, S. A.: Rates and pathways of CH4 oxidation in ferruginous Lake Matano, Indonesia, Biogeosciences Discuss. [preprint], https://doi.org/10.5194/bg-2015-533, in review, 2016.
Received: 14 Oct 2015 – Discussion started: 22 Feb 2016
Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
A. Sturm, D. A. Fowle, C. Jones, K. Leslie, S. Nomosatryo, C. Henny, D. E. Canfield, and S. A. Crowe
 
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Status: closed (peer review stopped)
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
A. Sturm, D. A. Fowle, C. Jones, K. Leslie, S. Nomosatryo, C. Henny, D. E. Canfield, and S. A. Crowe

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https://doi.org/10.5194/bg-2015-533-supplement

A. Sturm, D. A. Fowle, C. Jones, K. Leslie, S. Nomosatryo, C. Henny, D. E. Canfield, and S. A. Crowe

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Short summary
Methane is a very potent greenhouse gas whose release into the atmosphere has become a growing concern for global climate change. In nearly every aquatic environment there are microbes which either produce methane as a by-product of their metabolism or consume it for energy. Our work examined the rates of methane consumption through experimentation in a deep tropical lake to help quantify global emissions of this greenhouse gas from these environments and provide context for paleo-carbon cycles.
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