Improved aerosol optical depth and particle size index from satellite detected radiance.

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Author
Miller, Brian Herbert
Date
1991-12Advisor
Durkee, Philip A.
Second Reader
Wash, Carlyle H.
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Show full item recordAbstract
An algorithm that extracts aerosol optical depth and particle size index from satellite
observations of upwelling radiance over clear ocean areas was modified and studied. In
order to examine the algorithm's performance on a regional scale, a previously analyzed
data set, retrieved by the NOAA-9 AVHRR sensor, was reprocessed. The area of the
study was in the central Pacific Ocean during the RITS-88 cruise from 7 April to 5 May
1988. The results were compared to those of the earlier study and used to investigate
changes caused by modifications to the algorithm. One significant modification was to
account for the absorption of column water vapor in the calculations. In addition, the
correlation between aerosol optical depth and the two-term Henyey-Greenstein phase
function was investigated by normalizing measured radiance values.
The results compared well with the earlier study and supported the modifications to
the algorithm. Based on this study, aerosol optical depth was shown to be correlated to
the Henyey-Greenstein phase function. This knowledge helped in formulating improvements
to the phase function.
It was concluded that satellite imaging and processing on a regional scale is a useful
way to study marine aerosols, that results can be improved by considering the effects of
atmospheric water vapor absorption and other modifications to the calculations, and
that there is room for improvement to the two-term Henyey-Greenstein phase function.
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