Projekt

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Methane oxidation pathways at oxic-anoxic boundaries in lakes

Titel Englisch Methane oxidation pathways at oxic-anoxic boundaries in lakes
Gesuchsteller/in Wehrli Bernhard
Nummer 135299
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Abteilung Oberflächengewässer EAWAG
Hochschule Eidg. Anstalt für Wasserversorgung, Abwasserreinigung und Gewässerschutz - EAWAG
Hauptdisziplin Hydrologie, Limnologie, Glaziologie
Beginn/Ende 01.04.2011 - 31.03.2014
Bewilligter Betrag 489'322.00
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Alle Disziplinen (3)

Disziplin
Hydrologie, Limnologie, Glaziologie
Andere Gebiete der Umweltwissenschaften
Geochemie

Keywords (10)

methane oxidation; methanotrophs; chemical sensors; stable isotopes; methane; oxidation; lake; stable isotope; biomarker; profiling

Lay Summary (Englisch)

Lead
Lay summary
Methane emissions from lakes and reservoirs to the atmosphere contribute significantly to the global methane cycle . Lakes and reservoirs have so far not been part of global budgets but they could contribute up to 10% to the atmospheric flux. Such estimates are poorly constrained because methane is produced at highly variable rates in anoxic freshwater sediments, it can be oxidized in the sediment and in the water column, and transferred to the atmosphere either by diffusion or by rising bubbles.Over the last years, several pathways of methane oxidation in the absence of oxygen have been discovered. Anaerobic methane oxidation via sulfate reduction is now firmly established for marine systems. Recent laboratory evidence further proves that microbial methane oxidation is also proceeding with nitrate, nitrite, iron- and manganese oxides as electron acceptors. These new pathways could stabilize methane oxidation rates under fluctuating oxygen conditions in lakes. In this project we will address the following research questionsoWhich pathways of methane oxidation are operating at different redox environments in lakes and which fraction of methane is transformed by different electron acceptors?oHow are the concentrations and the fluxes of methane, oxidizing agents and micronutrients like copper controlling oxidation pathways and their rates?oWhat are the consequences of such coupled redox cascades for the overall methane oxidation, for the isotopic signature of methane, and for microbial production in the absence of light?We will address these questions with field studies in four selected lakes in Switzerland, Spain, Central Africa and Western Canada which exhibit redox interfaces in the water column with contrasting boundary conditions. The lakes differ in the availability of methane, their redox conditions, the vertical mixing regime. Our biogeochemical analysis will combine our expertise in newly established high-resolution profiling and sampling techniques, our experience in stable isotope and biomarker analysis, and our know-how in reaction-transport modeling. By focusing on consistent biogeochemical analysis of methane oxidation across several systems the project aims at providing general insights and reference data for improved global estimates.
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Mitarbeitende

Publikationen

Publikation
Crenothrix are major methane consumers in stratified lakes
Oswald Kirsten, Graf Jon S., Littmann Sten, Tienken Daniela, Brand Andreas, Wehrli Bernhard, Albertsen Mads, Daims Holger, Wagner Michael, Kuypers Marcel M.M., Schubert Carsten J., Miluka Jana (2017), Crenothrix are major methane consumers in stratified lakes, in ISME Journal.
Aerobic gammaproteobacterial methanotrophs mitigate methane emissions from oxic and anoxic lake waters
Oswald Kirsten, Milucka Jana, Brand Andreas, Hach Philipp, Littmann Sten, Wehrli Bernhard, Kuypers Marcel M. M., Schubert Carsten J. (2016), Aerobic gammaproteobacterial methanotrophs mitigate methane emissions from oxic and anoxic lake waters, in LIMNOLOGY AND OCEANOGRAPHY, 61, 101-118.
Methanotrophy under Versatile Conditions in the Water Column of the Ferruginous Meromictic Lake La Cruz (Spain)
Oswald Kirsten, Jegge Corinne, Tischer Jana, Berg Jasmine, Brand Andreas, Miracle Maria R., Soria Xavier, Vicente Eduardo, Lehmann Moritz F., Zopfi Jakob, Schubert Carsten J. (2016), Methanotrophy under Versatile Conditions in the Water Column of the Ferruginous Meromictic Lake La Cruz (Spain), in FRONTIERS IN MICROBIOLOGY, 7, 1-16.
Oxygenic primary production below the oxycline and its importance for redox dynamics
Brand Andreas, Bruderer Hannah, Oswald Kirsten, Guggenheim Carole, Schubert Carsten J., Wehrli Bernhard (2016), Oxygenic primary production below the oxycline and its importance for redox dynamics, in AQUATIC SCIENCES, 78(4), 727-741.
Light-Dependent Aerobic Methane Oxidation Reduces Methane Emissions from Seasonally Stratified Lakes.
Oswald Kirsten, Milucka Jana, Brand Andreas, Littmann Sten, Wehrli Bernhard, Kuypers Marcel M. M., Schubert Carsten J. (2015), Light-Dependent Aerobic Methane Oxidation Reduces Methane Emissions from Seasonally Stratified Lakes., in PLOS one, 10(7), 1-22.
Methane oxidation pathways and associated methanotrophic communities in the water column of a tropical lake
Zigah Prosper K., Oswald Kirsten, Brand Andreas, Dinkel Christian, Wehrli Bernhard, Schubert Carsten J. (2015), Methane oxidation pathways and associated methanotrophic communities in the water column of a tropical lake, in LIMNOLOGY AND OCEANOGRAPHY, 60(2), 553-572.

Zusammenarbeit

Gruppe / Person Land
Formen der Zusammenarbeit
Dr. Alfred Wüest, Eawag Schweiz (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation
- Forschungsinfrastrukturen
- Austausch von Mitarbeitern
Dr. Marcel Kuypers, MPI Bremen Deutschland (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation
- Forschungsinfrastrukturen
- Austausch von Mitarbeitern
Dr. Lee Bryant, Duke University Vereinigte Staaten von Amerika (Nordamerika)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Forschungsinfrastrukturen
Dr. Laura Sigg, Eawag Schweiz (Europa)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Forschungsinfrastrukturen
- Austausch von Mitarbeitern

Wissenschaftliche Veranstaltungen

Aktiver Beitrag

Titel Art des Beitrags Titel des Artikels oder Beitrages Datum Ort Beteiligte Personen
Ocean Sciences Meeting Einzelvortrag Methane oxidation in tropical Lake Kivu and sub-alpine Lake Zug: Insights from molecular and isotopic compositions. 22.02.2014 Honolulu, Vereinigte Staaten von Amerika Zigah Prosper; Wehrli Bernhard; Schubert Carsten;
AGU 46th annual Fall Meeting Poster Molecular and isotopic insights into methane oxidation in Lake Kivu 09.12.2013 San Francisco, Vereinigte Staaten von Amerika Wehrli Bernhard; Zigah Prosper; Schubert Carsten;
Goldschmidt Conference Poster Anaerobic methane oxidation in the water column of the eutrophic sub-alpine Lake Zug (Switzerland) 26.08.2013 Florence, Italien Wehrli Bernhard; Schubert Carsten; Oswald Kirsten Joan;
Iron Biogeochemistry – from Molecular Processes to Global Cycles, Centro Stefano Franscini Poster Linking anaerobic methane oxidation to the redox cycles of nitrogen, iron and manganese in lacustrine systems 03.03.2013 Ascona, Schweiz Wehrli Bernhard; Schubert Carsten; Oswald Kirsten Joan;


Kommunikation mit der Öffentlichkeit

Kommunikation Titel Medien Ort Jahr
Neue Medien (Web, Blogs, Podcasts, NewsFeed, usw.) Stauseen stossen Klimagase aus ETH Klimablog Deutschschweiz 2011

Auszeichnungen

Titel Jahr
ETH Medal for outstanding doctoral thesis 2016

Verbundene Projekte

Nummer Titel Start Förderungsinstrument
130097 The role of lake sediments in the carbon cycle: methane emission 01.06.2010 Projektförderung (Abt. I-III)
153091 Factors governing methane oxidation pathways at redox boundaries in lakes 01.04.2014 Projektförderung (Abt. I-III)
128707 High resolution in situ nutrient mapping of large rivers and reservoir systems 01.04.2010 R'EQUIP
156759 MOBtrait: Understanding the diversity of aerobic methane oxidizing bacteria in lacustrine oxyclines using community ecology and trait-based modeling 01.05.2015 Interdisziplinäre Projekte

Abstract

Recent reviews indicate that methane emissions from lakes and reservoirs to the atmosphere should be included in global budget. Natural wetlands contribute 20-33% of the total emissions. Lakes and reservoirs have so far not been part of global budgets but they could contribute up to 10% to the atmospheric flux. Such estimates are poorly constrained because methane is produced at highly variable rates in anoxic freshwater sediments, it can be oxidized in the sediment and in the water column, and transferred to the atmosphere either by diffusion or by bubble transport . Over the last years, several pathways of methane oxidation in the absence of oxygen have been established. Anaerobic methane oxidation via sulfate reduction is now firmly established for marine systems. Laboratory evidence further proves that microbial methane oxidation is also proceeding via nitrate, nitrite, and iron and mangenese oxides as electron acceptors. These new pathways could stabilize methane oxidation rates under fluctuating oxygen conditions in freshwater systems where gaps between the oxic zone and deep-water methane have been observed. So far it is not clear, to which extend micronutrients such as copper may limit methane oxidation by oxygen, but the importance of methanotrophic microorganisms for dark carbon fixation and for planktonik food webs is emerging as an important as pect of the carbon cycle in freshwater systems.Here we propose to address the following research questions•Which pathways of methane oxidation are operating at contrasting redox environments of lakes and which fraction of methane is transformed by different electron acceptors?•How are the concentrations and the fluxes of methane, electron acceptors and micronutrients like copper controlling oxidation pathways and their rates?•What are the consequences of such coupled redox cascades for the overall methane oxidation, for the isotopic signature of methane, and for dark microbial production?We will address these question with four selected field studies in Switzerland, Spain, Central Africa and Western Canada. The lakes to be studied show redox interfaces in the water column with contrasting boundary conditions regarding the availability of methane and electron acceptors, the vertical mixing regime and the seasonality of redox cycling. Our biogeochemical analysis will combine our expertise in•newly established high-resolution profiling and sampling techniques, •the analysis of stable isotopes, biomarkers and in-situ reaction rates and•and the know-how in reaction-transport modeling of the water column in physically well-characterized lake systems.
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