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SUMMARY:Interpreting the influence of air mass origin on the atmospheric c
 omposition of long term measurement stations - Dr. Zoe Fleming\, National 
 Centre for Atmospheric Science (NCAS)\, University of Leicester
DTSTART:20120522T143000Z
DTEND:20120522T153000Z
UID:TALK36077@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:In order to interpret the atmospheric chemistry measured at lo
 ng term ground-based stations\, the recent pathway of the air masses reach
 ing the site must be noted. In the past this was often done using the wind
  direction measurements at the site\, but these measurements represent the
  very recent air mass pathways and are often perturbed from the long term 
 pathways by local effects such as sea breeze effects and topography.\n\nA 
 comparison of various techniques for tracking the origin of the air masses
  are shown\, including wind directions\, trajectories and dispersion model
 s\, with a more detailed description of the Met office’s NAME dispersion
  model.\nInterpretation of the changing air mass influences at various sta
 tions (Weybourne\, London\, Cape Verde and Halley) using the NAME model ca
 n help to understand pollutant episodes or just long term trends in certai
 n atmospheric species passing over specific regions. \n\nExamples for the 
 sites in non polar regions are shown as well as a year round 10 day backwa
 rds record of the air mass pathway of air arriving at Halley\, Antarctica 
 are shown.\n
LOCATION:room 330b\,  British Antarctic Survey\, High Cross\, Cambridge\, 
 CB3 0ET
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