For full flight images, the horizontal display interval can vary depending on the length of the flight and for subsample images, the horizontal display interval is always constant. Vertical scales are consistent on all full flight and subsample images. Color scales do not change between images for ozone mixing ratio, ozone number density, aerosol depolarizations, and aerosol wavelength dependence. Logarithmic scales are used for the aerosol scattering ratio images to optimize display of PSC and sulfate layer features. Ozone mixing ratios and aerosol scattering ratios are calculated from DIAL measurements and atmospheric molecular densities from GSFC Assimilation Model GG1% 25x1 grid data interpolated to the DC-8 flight tracks. These molecular density curtain files were provided by GSFC codes 910.3 and 916.
Resolution of UV-DIAL Image data are:
Vertical averaging interval Ozone surface to DC-8 a/c altitude : 375 meters DC-8 a/c altitude to 10km above the a/c altitude : 750 meters 10km above DC-8 aircraft and up : 1200 meters All Others 75 meters Vertical display interval for averaged data All 75 meters
Horizontal averaging interval Aerosol 1 minute, or approximately 14.0 km. Depolarization 1 minute, or approximately 14.0 km. Wavelength Dependence 1 minute, or approximately 14.0 km. Ozone 5 minutes up to 19km, or approximately 70.0 km. 10 minutes 19-21km, or approximately 140.0 km 15 minutes 21-23km, or approximately 210.0 km 20 minutes above 23km, or approximately 280.0 km Horizontal display interval for averaged data other than full flight images All 6 seconds or approximately 1.4 kilometers.Times on the images are Universal Time (UT).