Movie:
Illustration of Regional Scale Transport of Ozone and its Precursor Species
During 6/9/91
Description:
Forward trajectories over laid on contoured AIRS ozone data
over the Eastern US from 6/8 - 6/11/91. The contoured plots of the AIRS
ozone data were created by performing a linear interpolation (i.e. morphing)
between the 2:00 PM ozone data. The forward trajectories were released
from Ohio on 6/9/91 14. The black squares mark the end of the trajectory
at each time step.
Purpose:
To illustrate the regional scale transport of ozone data
and its precursor species.
Method:
The forward trajectories were calculated using the CAPITA
Monte Carlo model, and 3-D Eulerian wind fields generated from the
National Meteorological Centers Nested Grid Model. One particle was released
from nineteen sources distributed over Ohio, and tracked for two days.
The morphed plots of the AIRS ozone data were created by first spatially
interpolating the 2:00 PM ozone data, i.e. contouring, then performing
a linear interpolation, i.e. morphing, between the 2:00 PM ozone contours.
Interpretation:
A stagnant airmass moving in a clockwise direction was located over Ohio
and the Ohio River Valley from June 8 - 9, 1991. During this time
period, the ozone concentration in this airmass increase from ~70 ppb to
~100 ppb. This high ozone airmass was then transported East traversing
Pennsylvania and New York and finally moving off the East coast by the
end of June 11. During the airmass's transport local emissions were added
contributing to its ozone concentration. This is clearly seen in the metropolitan
area stretching from Washington DC to New York city where the airmass's
ozone conentratrations increase as it traverses this metropolitan area.
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