Chemical Model Studies for AMMA Projects

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Chemical Model Studies for AMMA Projects

• Xin Yang and John PyleCentre for Atmospheric
  Science University of Cambridge
• Paris, 2-5 July, 2007

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Model information

• Model 3D chemical transport model, p-TOMCAT
• Forcing field ECWMF reanalysis data (every
  6hrs)
• Resolutions T42 (2.8x2.8 degrees) x 31 vertical
  layers
• Simulation period August, 2006
• Chemistry scheme includes detail isoprene
  chmeistry
• No biomass burning sources

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Model Results v. Measurements
August Mean
CO
Vertical gradient CO decrease with altitude O3
increase with altitude
Uplifted air High CO and low O3
Urban plumes High CO, O3 ?
Horizontal gradient CO increase to south O3
decrease to south
Biomass burning High CO and O3
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August Mean
O3
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August Mean
Isoprene primary biogenic source
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August Mean
HCHO
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August Mean
Acetone primary and secondary anthropogenic and
biogenic sources
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Deep convection effects
15 August
15 Aug.
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15 August
15 Aug.
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Local 6pm, 15 August
Local 12 am, 15 August
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Summaries

• The model can get the main structures of
  long-lived species such as CO and O3 in the
  vertical and horizontal direction over west
  Africa.
• Deep convection effects on species are also
  captured.
• With isoprene chemistry, organic species are well
  simulated.
• Urban scale plume can not be represented due to
  the coarse resolutions in both model and
  emissions

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Further work

• Using satellite biomass data to study burning
  plume effects
• Ozone budget over WF
• Soil NOx flux effects

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• Thanks to Claire Reeves and her UEA group for
  supplying measurement plots
• AMMA and NCAS supports