There are three types of files in this directory.

(1) The .sav files are idl save restore files containing trajectory information.  See details
    below

(2) The .pdf file contains plots of all the trajectories from points along the flight track
    (a subset of the trajectories in the idl save/restore files)

(3) The file_mmdd file contains a list of all the URLs of the save/restore files.  This is helpful
    for wget downloading (see below).


Detailed description:

The files in this directory are idl save/restore files containing 10-day
diabatic back trajectories from selected points along the flight tracks for all
the flights of ATTREX-3.  6-hourly ERA-Interim analyses (.75 by .75 degree resolution) were
used, along with heating rates depending on longitude, latitude, and altitude
(constant in time, based on CALIPSO/CLOUDSAT data -- see Yang et al, 2010).  Vertical
resolution of these analyses is approximately 1 km near the tropical tropopause.

The approach was to divide each flight into 1 hour segments, and initialize the back
trajectories for that segment at a single time, as denoted by the yymmddhhmmss (year, month, day, hour,
minute, second) in the file name.

The variables in each save/restore files are:

ALTAIR          FLOAT     = Array[62]
DATE            STRING    = '20140313'
DEPTH           LONG      =           24
DESCRIP1        STRING    = 'Trajectory information along the flight track for flight of DATE '
DESCRIP2        STRING    = 'Diabatic trajectories from NUMPERCLUST point clusters centered at NUMCLUS'...
DESCRIP2A       STRING    = ' This makes for NLOCS total trajectories '
DESCRIP3        STRING    = ' NUMPERCLUST points per cluster at NUMCALCN different theta levels'
DESCRIP4        STRING    = ' NUMPERLEV points at each theta level, spread perpendicularly to flight t'...
DESCRIP5        STRING    = ' Flight track points have indices (NUMPERCLUST*findgen(NUMCLUSTERS))+NUMP'...
DESCRIP6        STRING    = 'Flight track time(gmts),lon,lat,temp, and theta are: TIMAIR,LONAIR,LATAIR'...
DESCRIP7        STRING    = 'Traj time (Day of Year) in TSAVE.  There are NUMTIMS times'
DESCRIP8        STRING    = 'QSAVE,PSAVE,LONSAVE,LATSAVE,TEMSAVE are 2-D arrays (NLOCS trajectories,NU'...
DIAB            STRING    = 'diabatic'
DIAB_TYPE       STRING    = '_allsky'
LATAIR          FLOAT     = Array[62]
LATIN           FLOAT     = Array[558]
LATSAVE         FLOAT     = Array[558, 501]
LOCFIL          STRING    = 'attrefils/140313384201.locs'
LONAIR          FLOAT     = Array[62]
LONIN           FLOAT     = Array[558]
LONSAVE         FLOAT     = Array[558, 501]
NDAYS           INT       =       10
NLOCS           LONG      =          558
NSTR            STRING    = 'attre_140313384201_eraint_347_diabatic_10_558'
NUMCALCN        INT       =        3
NUMCLUSTERS     INT       =       62
NUMPERCLUST     INT       =        9
NUMPERLEV       INT       =        3
NUMTIMS         LONG      =          501
PSAVE           FLOAT     = Array[558, 501]
QSAVE           FLOAT     = Array[558, 501]
SOURCE          STRING    = 'ERAINT'
TEMAIR          FLOAT     = Array[62]
TEMSAVE         FLOAT     = Array[558, 501]
THEAIR          FLOAT     = Array[62]
THEIN           FLOAT     = Array[558]
TIMAIR          FLOAT     = Array[62]
TSAVE           FLOAT     = Array[501]
YYMMDDHHMMSS    STRING    = '140313384201'

The variables that end in "air" are the aircraft data points from which the back trajectories are initiated,
includint altair (pressure altitude), lonair, latair, timair (time, gmt seconds), temair (T,K), and theair
(theta, K).  For this particular file, there are 62 aircraft points for which we launch back trajectories.
To gauge uncertainty, trajectories are also launched from a cluster of points surrounding the aircraft
point.  There are 9 points per cluster (including the aircraft point).  Hence, in the example above, there
are 9 X 62 (or 558) total trajectories.  Note that the aircraft points in the 558 length arrays are
3, 12, 21, 30...  

The variables ending in "in" are the initial (latest time) points in each trajectory (lonin,latin, thein).
The trajectory information is in tsave (trajectory times in DOY of 2014), lonsave, latsave, 
temsave (temperature), and psave (pressure).

A convenient method of downloading is to do the following.
Download the files in this directory called "file_mmdd"  Each of these lists the URLS of all the
trajectory files for the flight on mmdd (month day) of ATTREX 3.

On your unix machine, type:

wget -i file_mmdd

This will automatically download all the files for the date mmdd.

If you have any questions, contact.

Lenny Pfister
leonhard.pfister@nasa.gov