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SUMMARY:The changes in greenhouse gases over the Anthropocene and their ca
 uses found from the ice core record (by Dave Etheridge)
DTSTART:20170906T100000Z
DTEND:20170906T113000Z
DTSTAMP:20170607T083632Z
UID:presentation-41.series-5
DESCRIPTION:The net greenhouse gas “radiative forcing” of climate is n
 ow at the highest level for at least 2 million years. The atmospheric conc
 entrations of the main greenhouse gases carbon dioxide\, methane and nitro
 us oxide have increased in the past centuries well beyond their natural le
 vels and many other greenhouse gases have appeared only in recent years. T
 he evidence for these changes will be the focus of this presentation. It i
 s found from observational networks around the world over past decades and
  is extended back in time using measurements of air naturally enclosed in 
 polar ice. The causes of the changes are inferred from the concentration o
 f each gas over time and location and from its isotopic composition which 
 retains a signature of the gas source and of its atmospheric loss processe
 s. The concentration records are used together with estimates of changes i
 n natural and anthropogenic aerosols\, solar radiation and land surface in
  climate models to compare model output with observed or proxy climate ind
 ices. With this information it is possible to better understand the main d
 rivers of the earth system\, to predict future climate under various emiss
 ions scenarios and to make more informed decisions regarding mitigation.
LOCATION:SR Wegener Center\, Brandhofgasse 5\, 1st floor
ORGANIZER;CN="Douglas Maraun";ROLE=CHAIR:MAILTO:douglas.maraun@uni-graz.at
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