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UID:20250828T214314EDT-0530e7vPU4@132.216.98.100
DTSTAMP:20250829T014314Z
DESCRIPTION:Please join us as we welcome Dr. Peter Douglas\, a Professor in
  the Department Earth and Planetary Sciences at ºÚÁϲ»´òìÈ University for a se
 minar titled 'Clumped isotope measurements as a new tracer of methane sour
 ces and sinks.' Coffee will be served.\n\nAbstract\nMethane is an importan
 t greenhouse gas\, and isotopic measurements have long been a valuable too
 l for tracing methane sources and sinks\, both on a local and a global sca
 le. Despite this\, there are key ambiguities in conventional isotopic fing
 erprinting of methane. Recently\, the measurement of multiply-substituted 
 isotopologues\, or clumped isotopes\, has provided a new dimension of isot
 opic data that has the potential to provide important new insights into me
 thane biogeochemistry. Clumped isotopes refer to methane molecules that co
 ntain multiple rare isotopes\, such as 13CH3D or 12CH2D2\, which recent de
 velopments in isotope ratio mass spectrometry and laser spectroscopy have 
 made it possible to analyze at natural abundances. When methane forms in i
 sotopic equilibrium\, clumped isotope values are directly controlled by th
 e formation temperature\, providing an excellent tool for differentiating 
 methane derived from different geological settings. However\, methane prod
 uced by microbes in Earth surface environments is subject to a strong kine
 tic isotope effect that overwhelms this equilibrium thermodynamic signal. 
 While the kinetic isotope effect complicates using this measurement for th
 ermometry in some cases\, it also has the potential to provide new insight
 s into the metabolism of methanogenic microbes in different environments. 
 I will provide an overview of clumped isotope measurements made to date an
 d their ability to distinguish different methane sources and sinks\, and t
 hen explore in more detail measurements of methane from high-latitude lake
 s\, which recent studies suggest are an important source of atmospheric me
 thane. Finally\, I will discuss how clumped isotope measurements can be in
 tegrated with other isotope measurements to improve our understanding of g
 lobal methane budgets.\n
DTSTART:20161121T203000Z
DTEND:20161121T213000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Seminar: Dr. Peter Douglas
URL:/meteo/channels/event/seminar-dr-peter-douglas-263
 738
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