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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.

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Presentation on theme: "ICARTT J31 Data Workshop March 9, 2005, NOAA Aeronomy Lab, Boulder Particle dispersion modeling with FLEXPART: possibilities for J31 Andreas Stohl Norwegian."— Presentation transcript:

1 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

2 Presentation of the webpage created by Andreas Stohl Why does this webpage exist? 1.For your convenience 2.To prevent you from using outdated back trajectories for interpreting valuable measurement data

3 Why are trajectories outdated?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

4 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.

5 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

6 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) 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 boxes are created

7 1x1 degree output resolution

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9 0.25 x 0.33 degree output resolution

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