trajectories available at Empa are based on 3D winds of ECMWF similar
to Lagranto. FLEXTRA does not use the
vertical winds provided by ECMWF directly but uses its own field calculated
from the divergence of the horizontal wind components.
Four-hourly trajectories based on 6-hourly ECMWF analyses at 1°
x 1° resolution and 60 vertical levels (90 since February 2007)
are calculated routinely since 12 June 2006 for a large number of
stations given here. Additional
trajectory files are available back to 2002 but only for a few selected
The interactive Flextra
output browser is available via the GAW website.
Global 1° x 1° x 60 levels ECMWF meteorological input files
in GRIB format are available completely since January 2001. The
same files are also used by Flexpart. Thus, Flextra (and Flexpart)
calculations can be performed rather quickly for any time and location
since 2001. Due to the large amount of data not all files are stored
on the local disk on lin3a134 anymore. These files are, however,
still available from the remote4/ disk and are additionally
backuped on tape.
Higher resolution ECMWF input fields with approx. 25 km x 25 km
horizontal resolution for the European domain are routinely retrieved
since the end of March 2007.
- Reading data: /home/brd134/IDL/hiphop/read_flextraj.pro
on Linux or G:\134 Themen\Modellierung\brd\hiphop\read_flextraj.pro
- Analysis trajectories: /remote0/daily_trajek/ecmwf_traj/flextra
- PNG images: /remote0/daily_trajek/ecmwf_traj/flextra
- Google Earth overlays: /remote0/daily_trajek/ecmwf_traj/flextra
- ECMWF GRIB data for Flextra: /remote4/ecmwf_backup