NEAQS 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 100 (blue), 500 (green), 2500 (red) and 5500 (black) meters (nominally 990, 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 entire set of trajectorie gif files can be downloaded in one "tar" file as  rhb_neaqs_traject_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_neaqs_traject_data.tar.gz.  The individual data files are named with the date and hour in the file name followed by a 0, 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 54 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
jul13 194 00 06 12 18 00 06 12 18
jul14 195 00 06 12 18 00 06 12 18
jul15 196 00 06 12 18 00 06 12 18
jul16 197 00 06 12 18 00 06 12 18
jul17 198 00 06 12 18 00 06 12 18
jul18 199 00 06 12 18 00 06 12 18
jul19 200 00 06 12 18 00 06 12 18
jul20 201 00 06 12 18 00 06 12 18
jul21 202 00 06 12 18 00 06 12 18
jul22 203 00 06 12 18 00 06 12 18
jul23 204 00 06 12 18 00 06 12 18
jul24 205 00 06 12 18 00 06 12 18
jul25 206 00 06 12 18 00 06 12 18
jul26 207 00 06 12 18 00 06 12 18
jul27 208 00 06 12 18 00 06 12 18
jul28 209 00 06 12 18 00 06 12 18
jul29 210 00 06 12 18 00 06 12 18
jul30 211 00 06 12 18 00 06 12 18
jul31 212 00 06 12 18 00 06 12 18
aug01 213 00 06 12 18 00 06 12 18
aug02 214 00 06 12 18 00 06 12 18
aug03 215 00 06 12 18 00 06 12 18
aug04 216 00 06 12 18 00 06 12 18
aug05 217 00 06 12 18 00 06 12 18
aug06 218 00 06 12 18 00 06 12 18
aug07 219 00 06 12 18 00 06 12 18
aug08 220 00 06 12 18 00 06 12 18
aug09 221 00 06 12 18 00 06 12 18
aug10 222 00 06 12 18 00 06 12 18