Back Trajectories

7-day Back trajectories to the ship have been calculated using the HYSPLIT 4 model.  A description of HYSPLIT  can be found on the NOAA ARL web server.  The model runs were made using Global FNL grided data.  Vertical motions were calculated from the data vertical velocity (omega) field. Trajectories were calculated at 6-hour intervals for trajectories arriving at the ship location at altitudes of 500 (green), 2500 (red) and 5500 (black) meters (nominally 950, 750 and 500 mbar).  The numbers on each line are the number of days (24 hour periods) back at that location from the arrvial time at the ship location.  The trajectories were plotted with FERRET and the plots have been converted to gif files.  The gif files are available in the table below.  The "Large Region" shows the trajectories plotted as in above left, the "small region" shows the same trajectories ploted onto a smaller region as in above right.  The entire set of trajectorie gif files can be downloaded in one "tar" file as  rhb_traj_gifs.tar .  Filenames indicate the date and time of each trajectory

The trajectory data files are accessible as a tar-gzip (.tar.gz) data file: rhb_traj_data.tar.gz.  The individual data files are named with the date and hour in the file name followed by a 9,7 or 5 for the three heights.  After the first five header lines the data fields are: traj number, met grid number, year, month, day, hour, minute, forecast hour, age of trajectory (negative for back trajectory), lat, longt, height (meters), pressure (mbar).  A complete description of the data format can be found on page 31 of  the HYSPLIT_4 User's Guide, available in PDF format from the NOAA-ARL server.

Back Trajectory Plots

Calendar
Day
DOY
  
Large Region
Hour
Small Region
Hour
mar16 75 00 06 12 18 00 06 12 18
mar17 76 00 06 12 18 00 06 12 18
mar18 77 00 06 12 18 00 06 12 18
mar19 78 00 06 12 18 00 06 12 18
mar20 79 00 06 12 18 00 06 12 18
mar21 80 00 06 12 18 00 06 12 18
mar22 81 00 06 12 18 00 06 12 18
mar23 82 00 06 12 18 00 06 12 18
mar24 83 00 06 12 18 00 06 12 18
mar25 84 00 06 12 18 00 06 12 18
mar26 85 00 06 12 18 00 06 12 18
mar27 86 00 06 12 18 00 06 12 18
mar28 87 00 06 12 18 00 06 12 18
mar29 88 00 06 12 18 00 06 12 18
mar30 89 00 06 12 18 00 06 12 18
mar31 90 00 06 12 18 00 06 12 18
apr01 91 00 06 12 18 00 06 12 18
apr02 92 00 06 12 18 00 06 12 18
apr03 93 00 06 12 18 00 06 12 18
apr04 94 00 06 12 18 00 06 12 18
apr05 95 00 06 12 18 00 06 12 18
apr06 96 00 06 12 18 00 06 12 18
apr07 97 00 06 12 18 00 06 12 18
apr08 98 00 06 12 18 00 06 12 18
apr09 99 00 06 12 18 00 06 12 18
apr10 100 00 06 12 18 00 06 12 18
apr11 101 00 06 12 18 00 06 12 18
apr12 102 00 06 12 18 00 06 12 18
apr13 103 00 06 12 18 00 06 12 18
apr14 104 00 06 12 18 00 06 12 18
apr15 105 00 06 12 18 00 06 12 18
apr16 106 00 06 12 18 00 06 12 18
apr17 107 00 06 12 18 00 06 12 18
apr18 108 00 06 12 18 00 06 12 18
apr19 109 00 06 12   00 06 12