ICARTT J31 Data Workshop

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ICARTT J31 Data Workshop March 9, 2005, NOAA
Aeronomy Lab, Boulder Particle dispersion
modeling with FLEXPART possibilities for
J31 Andreas Stohl Norwegian Institute for Air
Research (NILU), Norway Plus GOES 1-km visible
satellite products Owen Cooper Cooperative
Institute for Research in Environmental Sciences
University of Colorado/ NOAA Aeronomy
Laboratory, Boulder
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Presentation of the webpagehttp//niwot.al.noaa.
gov8088/icartt_analysiscreated by Andreas
Stohl

• Why does this webpage exist?
• For your convenience
• To prevent you from using outdated back
  trajectories for interpreting valuable
  measurement data

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Why are trajectories outdated?

• Trajectories are not state-of-the-art anymore
• Trajectories provide no quantitative information
• Trajectories do not include turbulence and
  convection
• Trajectories can be VERY misleading

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The new way of doing things right

• Use a particle dispersion model (FLEXPART) in
  backward dispersion mode to calculate so-called
  retroplumes, 20 days back in time.
• FLEXPART includes turbulence and convection
  parameterizations and yields a quantitative
  response function to emissions eventually taken
  up.
• Do everything twice using two independent
  datasets (ECMWF GFS) to compare results and get
  a feeling for the uncertainties involved.

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What are the input data?

• GFS analyses
• Resolution 1 x 1 degree
• 26 pressure levels
• Every 3 hours
• ECMWF analyses
• Resolution 1x1 degree, but 0.36 x 0.36 degree
  over North America and the Atlantic
• 60 model levels
• Every 3 hours

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Where are simulations started from?

• From along the flight tracks
• Every time the aircraft changes location by more
  than 0.2 degree latitude or longitude, or changes
  altitude by 50 m below 300 m (400 m above 3000 m,
  100 m in between).
• 40.000 particles are released from a small 4-D
  box (space time) covering the sampled volume
  (i.e., a 1-D time box for surface stations).
• For a given flight, about 200-500 boxes are
  created

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1x1 degree output resolution
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1x1 degree output resolution
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0.25 x 0.33 degree output resolution
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0.25 x 0.33 degree output resolution
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0.25 x 0.33 degree output resolution
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0.25 x 0.33 degree output resolution
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0.25 x 0.33 degree output resolution
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1x1 degree output resolution
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http//www.al.noaa.gov/metproducts/icartt04/
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http//www.al.noaa.gov/metproducts/icartt04/
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http//www.al.noaa.gov/metproducts/icartt04/
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http//www.al.noaa.gov/metproducts/icartt04/
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http//www.al.noaa.gov/metproducts/icartt04/
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http//www.al.noaa.gov/metproducts/icartt04/
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http//www.al.noaa.gov/metproducts/icartt04/
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