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SUMMARY:Methane in aquatic systems - Formation\, mixing\, oxidation\, and 
 emission
DTSTART:20140318T161500
DTEND:20140318T171500
DTSTAMP:20260510T054631Z
UID:aa0b62b791fa72d1add37d8d9b3ea6f19dfc519f8668a18b96822919
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Carsten Schubert\, Surface Waters Research and Management\,
  EAWAG\, Duebendorf\, CH\nAbstract:\nMethane is about 22 times stronger th
 an CO2 as a greenhouse gas and has been accumulated strongly in the atmosp
 here during the last decades. However\, emissions from aquatic systems in 
 Switzerland are not well constrained. We have investigated several lakes a
 nd reservoirs in Switzerland and I will show some results of this research
 . The main topic is how to constrain methane oxidation in freshwater syste
 ms. From the ocean we know that most of the methane formed in the sea floo
 r is anaerobically oxidized via sulfate already in the sediments and/or la
 ter in the water column. In lakes sulfate concentrations are low and metha
 ne could be oxidized either aerobically with oxygen or anaerobically via o
 ther electron acceptors (nitrate\, iron\, manganese). I will show data fro
 m freshwater systems in Switzerland to demonstrate how methane is transfor
 med into carbon dioxide using mainly isotopic\, mass spectrometer\, and in
 cubation methods.Short biography:\nCarsten Schubert is a biogeochemist wit
 h a strong expertise in stable isotope geochemistry\, organic geochemistry
  and biogeochemistry. He traces biogeochemical processes and interactions 
 in marine and lacustrine sediments and water bodies. His research has led 
 to over 75 publications. Through the analysis of specific biomarkers (both
  concentration and isotopic composition) in water column and sediments it 
 was possible to study phytoplankton community structures\, demonstrate tha
 t CH4 is actively consumed under anaerobic conditions\, showthe first conc
 lusive evidence for anammox in a lacustrine system (Lake Tanganyika) or re
 constructocean currents off Newfoundland using 15N of amino acids in deep 
 sea corals. Most recently\, methane emissions were determined from lakes\,
  reservoirs and rivers\; processes related to methane oxidation in the wat
 er column of Lake  Kivu\, several Swiss lakes and in the Arctic Tundra wa
 s investigated\, finally we work on the degradation/preservation of amino 
 acids and amino sugars in Swiss lakes.\nCarsten Schubert is head of the de
 partment “Surface Waters-Research and Management” at the Swiss Federal
  Institute of Aquatic Science and Technology (Eawag).
LOCATION:GR A3 32 http://plan.epfl.ch/?room=GR%20A3%2032
STATUS:CONFIRMED
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