Title: Model Trajectories, Back BoM GASP (C130) for Huebert's Suggested
       Averaging times

Contact:

   Steve Siems
   Monash University
   Department of Mathematics
   Clayton, Victoria, , AUSTRALIA, 3168
   Telephone: (61) 3-905-4406
   Facsimile: (61) 3-905-3807
   E-Mail Address: siems@cyclone.maths.monash.edu.au  or
   s.siems@sci.monash.edu.au


Data Set Description:

Backtrajectories are calculated with the NOAA HYSPLIT 3.2 code using
the Australian Bureau of Meteorology (BoM) GASP model.  This model has
approximately 5 degree horizontal resolution and 18 levels in the
vertical.  These data are then interpolated onto omega fields for use
with HYSPLIT.

For each series of trajectories an ASCII file is provided
which contains the time, lat, lon, pressure, U, V, vertical
velocity in pressure, temperature, relative humidity and surface pressure.
These fields come from the GASP data set.

Trajectories will fail if the track hits the surface, rises above approx
500 HPa or flows off the restricted domain of the GASP data.  Also, the
lowest interpolated GASP data is to the 0.991 omega level.  This corresponds
to roughly 110 meters height.  Trajectories below this level are not
accurate.  Most likely they will be moving too quickly as they do not
reflect the physics of the surface drag on the air flow.  They still provide
a good estimate of the air motion for the first 12-24 hours.

These trajectories are designed to aid in the analysis of
the C-130 observations in missions based out of Hobart. These trajectories
correspond to the 194 flight legs of the C-130 that Barry Huebert listed
(see the dataset "C130 Suggested Averaging Times") FOR FLIGHTS 11-28 ONLY.

Format: space-delimited ASCII with fields:

DATE TIME LAT(N) LONG(E) HGT(mb) TRAJ# UWND VWND OMEGA(mb/s) TEMP SPHU
SFCP

DATE is YYYY/MM/DD (UTC)
TIME is HH:MM:SS (UTC)


File Name Conventions:
Data has been divided between several subdirectories based on the
original flight leg/sampler name.

For example, the file b0222.dat in the subdirectory c321 corresponds
to Huebert's sample name C321B0222 from the C-130 Suggested Averaging
Times dataset. Subdirectories are the first 4 characters of the sample
name, and filenames are from the rest of the sample name with ".dat".


References:

C130 Suggested Averaging Times dataset, directory cdone/c130/chem/hue_avg/