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flextract reference

AUTHORS

Alexander Läderach, Harald Sodemann

PURPOSE:

Extract trajectories from FLEXPART particle binary format and convert them to LAGRANTO-format.

AVAILABLE DATA:

5 mio. global FLEXPART-trajectories covering 1979-01-02 00:00 to 2013-12-31 15:00 UTC. Stored at “/tempest/sdisk/alexander/flexpart/global_corr/” (input-path).

GET STARTED:

Create a settings-file with the following structure (smaller, bold font):

# --------------------------------------------------------- #
# Settings to extract FLEXPART trajectories from database # # NOTE: All lines beginning with # and empty ones ignored # # --------------------------------------------------------- #
# Path to the FLEXPART trajectory files (Input) /tempest/sdisk/alexander/flexpart/global_corr/
# Path to store trajectories in LAGRANTO-format (Output) /home/alaedera/progs/flextract/
# Begin time (Year Month Day Hour Min Sec) 2000 1 1 0 0 0
# End time (Year Month Day Hour Min Sec) 2000 1 2 0 0 0
# Timestep (hours) 3
# Trajectory length (hours) 24
# Only consider each nth-particle only (1=each of the 5mio. particles) # NOTE: could lead to huge output if too small
10
# Target area (minlon maxlon minlat maxlat) 5 17 43 49

USAGE:

./flextract <settings-file>

NOTE:

The minimal timestep for the trajectories to be extracted is 3 hours. The timesteps 00 06 12 18 are given by the ERA-interim reanalysis and the 03 09 15 21 timesteps are given by the forecasts of the model used to produce ERA-interim.