BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Quantifying changes in past atmospheric chemistry from ice core re
 cords of the oxygen isotopes of sulfate and nitrate - Dr. Eric Sofen\, Uni
 versity of York
DTSTART:20131108T133000Z
DTEND:20131108T143000Z
UID:TALK48387@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:The triple isotopic composition of oxygen (Δ17O) in sulfate a
 nd nitrate indicate the relative importance of oxidation pathways in their
  formation in the atmosphere.  Ice core measurements of their isotopic com
 position can then provide insights into past changes in sulfate and nitrat
 e chemistry.  Due to the complexity of the isotopic system (e.g. multiple 
 reactions can result in the same isotopic composition)\, quantitative inte
 rpretation is challenging\, but has been aided by the application of paleo
 -atmospheric chemistry models ranging from box models to chemical transpor
 t models and coupled climate-chemistry models.  I will present measurement
 s and interpretation of both sulfate and nitrate isotopes from the WAIS Di
 vide\, Antarctica ice core spanning the past 2500 years [Sofen et al.\, AC
 PD\, 2013] as well as new results from a coupled climate-chemistry model f
 ocused on glacial-interglacial changes in atmospheric chemistry in the con
 text of existing sulfate Δ17O measurements from Vostok [Alexander et al.\
 , 2002].
LOCATION:room 187\,  British Antarctic Survey\, High Cross\, Cambridge\, C
 B3 0ET
END:VEVENT
END:VCALENDAR