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SUMMARY:Estimating baseline trends and regional emissions from surface obs
 ervations - Dr Alistair Manning\, Met Office
DTSTART:20090925T130000Z
DTEND:20090925T143000Z
UID:TALK20046@talks.cam.ac.uk
CONTACT:Dr Francis Pope
DESCRIPTION:The AGAGE (Advanced Global Atmospheric Gases Experiment) obser
 vation station at Mace Head (53°N\, 10°W) on the west coast of Ireland i
 s ideally situated to observe long-term trends in trace gas concentrations
 . The station meteorology is dominated by westerly winds that allow it to 
 frequently sample well-mixed Northern Hemispheric air masses. These observ
 ations are isolated and used to estimate mid-latitude Northern Hemisphere 
 baseline concentrations of a wide range of trace gases\, most notably the 
 principle greenhouse gases\; carbon dioxide\, methane\, nitrous oxide\, oz
 one and the principle ozone-depleting gases\; CFCs\, HCFCs.\n\n\n\nThe air
  mass sorting requires knowledge of the recent history of the air mass tha
 t is sampled and this is obtained from the NAME model (Numerical Atmospher
 ic dispersion Modelling Environment). This is the Met Office’s Lagrangia
 n atmospheric dispersion model that can use 3-D meteorology from either th
 e Met Office’s or ECMWF’s numerical weather prediction models.\n\n\n\n
 On a reasonable number of days (~30%) Mace Head receives air from the UK a
 nd the continent. By using inversion modelling it is possible to estimate 
 the source strengths and geographical distributions of the emissions that 
 provide the best statistical match to the observed above-baseline ‘pollu
 tion’ events.\n\n\n\nIn this way surface observations can be used to val
 idate the reported inventory-based “bottom-up” emissions required thro
 ugh the Kyoto Protocol process.\n\n
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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