Information Regarding PEM-Tropics B UV DIAL Images

Major PEM-Tropics B Lidar References

PEM-Tropics B UV DIAL IMAGES

The horizontal display interval of the full flight images depends on the length of the flight. Both nadir and zenith data are imaged together, with a black trace appearing at the aircraft altitude. Only one color scale is used for the ozone images, and only one color scale is used for the aerosol images. The vertical scale factor is consistent between images, but the horizontal scale factor may change from one image to the next without any specific notation. The spacing of time ticks should be sufficient to indicate when this has occurred. 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 Real-Time UV DIAL Image data are:



      VERTICAL RESOLUTION:



Vertical averaging interval
          Aerosol     30 meters
Ozone      300 meters excepting Flights 16 and 19 which are 900 meters.

Vertical display interval for averaged data
          Aerosol    60 meters
Ozone      60 meters



       HORIZONTAL RESOLUTION:



Horizontal averaging interval
          Aerosol    2.00 seconds, or approximately 470 meters.
Ozone      300 seconds, or approximately 70 kilometers excepting Flights 16 and 19
which are 60 seconds, or 14 kilometers.

Horizontal display interval for averaged data other than full flight images
          Aerosol    6 seconds or approximately 1.4 kilometers
Ozone      6 seconds or approximately 1.4 kilometers 


      Times on the images are Universal Time (UT).



These airborne DIAL data images are to be used as a reference to the digital data to be archived by December 3, 1999 at the NASA Langley DAAC.  Please contact either Dr Ed Browell or Dr Syed Ismail at NASA Langley for access to PEM-Tropics B LASE digital data prior to archiving.  Images are not to be published without permission from NASA Langley.



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