Inversion of Multi-Angle Radiation Measurement Page: 2 of 8
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Fifteenth ARM Science Team Meeting Proceedings, Daytona Beach, Florida, March 14-18, 2005
When we look at the in situ observations of particle size within the cloud on days when the polarization
and reflectance size retrievals differ we find that there is a strong vertical gradient in particle size. If we
then take a simple minded look at the optical depths that contribute to the observed (polarized)
reflectance we find that the polarized reflectance measurements respond to an optical depth of less than
three while the reflectance measurements respond down to an optical depth of twenty (2250 nm). The
difference in sizes retrieved using polarization measurements and reflectance measurements can
therefore be explained by the difference depths in the cloud that generate the two signals and the
different particle sizes that are present at those depths.
Snow 100um 90
120 . 60
180 --. - .
Snow 500um 90
0.400 0.600 0.800
Figure 2. a) Vertical variation of liquid water content (black line) and effective radius (red line)
estimated for a transect through a cloud. Mean effective radius for straight and level legs are shown as
red symbols. b) (Polarized) Reflectance Ratio (reflectance value normalized by the value for a semi-
infinite cloud) as a function of optical depth for a range of different viewing angles.
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Cairns, B.; Alexandrov, M. Lacis, A. & Carlson, B. Inversion of Multi-Angle Radiation Measurement, article, March 18, 2005; New York, New York. (digital.library.unt.edu/ark:/67531/metadc778858/m1/2/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.