Synoptic scale features associated with vertical distribution of IR aerosol extinction.
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Author
Heil, James Norman
Date
1981-03Advisor
Davidson, K.L.
Second Reader
Schacher, Gordon E.
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Show full item recordAbstract
Observed vertical profiles of optical extinction due to aerosol
scattering were examined relative to prevailing synoptic scale
features. This examination was on the suitability of an existing
wind speed and humidity dependent extinction model during different
synoptic conditions . The primary synoptic features in
question are the depth of the atmospheric well mixed layer and
the nature of the capping inversion. Aerosol extinction profiles
were calculated from aerosol size distributions measured from
an aircraft in the vicinity of Monterey Bay. Mixed layer
descriptions were obtained from temperature and humidity profiles
obtained from aircraft spiral ascents and shipboard and
shoreline radiosonde launches. The presence of the inversion
reduced the accuracies of the current Navy (Wells-Katz) and
Air Force (LOVJTRAN 33)- models in estimating the extinction
profile . The inversion represents a cap to the vertical transport
of surface generated aerosols. This is not accounted for
in the models. LOWTRAN 33 was found to be inadequate in most
respects whereas the Wells-Katz model could be modified to
obtain reasonable predictions. Model specification of the
continental component was also found to be a significant factor
in the comparisons.
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