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SUMMARY:Nitrogen and oxygen isotopic constraints on the budget of NOx and 
 nitrate in polar regions - Dr Samuel Morin of Laboratoire de Glaciologie e
 t Geohysique de l'Environnement\, Grenoble\, France
DTSTART:20081203T110000Z
DTEND:20081203T120000Z
UID:TALK14461@talks.cam.ac.uk
CONTACT:Dr Glenn Carver
DESCRIPTION:The last 10 years have seen the parallel development of active
  research on the budget of reactive nitrogen species in polar regions\, tr
 iggered by the discovery that polar snowpacks could be a source of NOx to 
 the overlying atmosphere\, and the instigation of sensitive analytical tec
 hniques to analyze the comprehensive isotopic composition of nitrate (d15N
 \, d17O and d18O).\n\nIn my talk\, I will show the benefits of the synerge
 tic use of stable isotopes approaches for nitrate in polar areas. Recent p
 rogresses have been made in terms of the identification of direct nitrate 
 sources (e.g. stratospheric injections to the Antarctic atmosphere)\,  NOx
  oxidation pathways (including the role of halogens during the spring) and
  NOx sources (in particular snowpack emissions)\, to unravel the seasonal 
 variations of the budget of reactive nitrogen species in the Arctic and th
 e Antarctic atmosphere. Recent investigations carried out in the Antarctic
  snowpack itself reveal the potential of coupled O and N isotopic studies 
 to distinguish between evaporation and photolysis of nitrate in the snow.\
 n\nThis research has strong implications (and potential) for the understan
 ding of the oxidative power of the atmosphere in polar regions\, and for t
 he interpretation of the message carried by nitrate buried in ice-cores.\n
 \n
LOCATION:Room 307\, British Antarctic Survey
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