Information Regarding TRACE-P UV DIAL Images

TRACE-P UV DIAL IMAGES

The horizontal display interval of the full flight images depends on the length of the flight. The horizontal display interval on the other images is 4 seconds. Both nadir and zenith data are imaged together. In the aerosol images, a black trace appears at the aircraft altitude. In the ozone images, in situ ozone measurements appear at the aircraft altitude and modeled ozone fills in the data gaps above and below the aircraft, and to the ground in most cases. Only one color scale is used for the ozone images. Only one color scale is used for the aerosol images. The vertical scale factor is consistent between images. Aerosol data are reported as Atmospheric Scattering Ratios on a logarithmic scale. Ozone data are reported as mixing ratios (ppbv) on a linear scale.

Resolution of UV DIAL Image data are:



VERTICAL RESOLUTION:



Vertical averaging interval
          Aerosol     30 meters
Ozone      300 meters

Vertical display interval
          Aerosol    30 meters
Ozone      30 meters




HORIZONTAL RESOLUTION:



Horizontal averaging interval
          Aerosol    60.0 seconds, or approximately 14.0 kilometers.
Ozone      300 seconds, or approximately 70.0 kilometers
600 seconds, or approximately 140.0 kilometers for data
more than 5.0 kilometers below the aircraft.

Horizontal display interval for averaged data other than full flight images
          Aerosol    4 seconds or approximately 0.933 kilometers
Ozone      4 seconds or approximately 0.933 kilometers


      Times on the images are Universal Time (UT).




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