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SUMMARY:New insights into past methane cycle changes from ice cores - Prof
 . Hubertus Fischer\, Institute of Climate and Environmental Physics\, Univ
 ersity of Bern\, Switzerland.
DTSTART:20140909T130000Z
DTEND:20140909T140000Z
UID:TALK53753@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:Latest analytical progress in methane ice core studies in term
 s of temporal resolution but also in terms of the methane isotopic composi
 tion provides new insights into past changes in the global methane cycle. 
 The use of bipolar (isotopic) methane records allows us to determine the e
 missions of different methane source for times of relatively stable enviro
 nmental conditions such as the Holocene. For glacial/interglacial changes\
 , however\, we found that not only wetland emission strengths are changing
  but also the isotopic signatures of the methane sources themselves are al
 tered considerably. While this change in source signature allows us to mak
 e inferences about previously underestimated ecosystem changes in the past
 \, it leaves the methane budget on such long time scale still underconstra
 ined.
LOCATION:room 187\,  British Antarctic Survey\, High Cross\, Cambridge\, C
 B3 0ET
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