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(December 1st 1999)

Trajectories are made by Mijke Zachariasse (tel.: 030-2206797),
email:zacharia@knmi.nl

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5-day backward trajectories were calculated from
specific locations in the MBL where canisters were taken.
The names of these files are, for example, 'TRAJ_JO_bw_16_2.ps',
which are the trajectories for the 16th of February.
Colours indicate the pressure of the trajectory:

	dark blue: p<200 hPa
	light blue: 200<p<250 hPa
	green: 250<p<300 hPa
	olive: 300<p<400 hPa
	brown: 400<p<500 hPa
	red: 500<p<850 hPa
	purple: p>850 hPa

A black dot indicates timesteps of 12 hours. The trajectories are 3D
kinematic trajectories, which were released from a 3D box surrounding
the site of interest. In de EW and NS direction the length of this box
is 1 degrees.

There are also upper tropospheric trajectories indicated by names
such as 'TRAJ_JO_ut_15_3_99_1.ps', these are 10 day back trajectories.