Inversion of Multi-Angle Radiation Measurement Page: 1 of 8
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Fifteenth ARM Science Team Meeting Proceedings, Daytona Beach, Florida, March 14-18, 2005
Inversion of Multi-Angle Radiation Measurement
B. Cairns and M. Alexandrov
New York, New York
A. Lacis and B. Carlson
NASA Goddard Institute for Space Studies
New York, New York
Observations of the polarization and reflectance in bands at 865 nm (negligible liquid water absorption)
and 2250 nm (strong liquid water absorption) cannot be fitted by a simple atmospheric model consisting
of a homogeneous cloud with a single particle size.
If we use the polarization (polarized reflectance) measurements and the reflectance measurements to
retrieve cloud particle size independently we find that it is frequently (although not always) the case that
the size retrieved with the polarization measurements is larger than the size retrieved using the
reflectance measurements (Figure 1).
1 .0 i ' ...' ' ' ' ' ' I ' ' ' ' I ' 1
5.0 10.0 20.0 40.0
Figure 1. Effective radius retrievals using polarized reflectance (blue) and reflectance with effective
variances of 0.05, 0.1, 0.15 and 0.2 (mauve, turquoise, green, red). Polarized reflectance provides
effective variance retrieval also. Retrievals use data taken on 25th July 2003 during the CSTRIPE field
experiment and use Research Scanning Polarimeter (RSP) data taken at 410, 865 and 2250 nm over
stratocumulus clouds near Monterey. Retrievals were validated against in situ measurements and
agree to within 0.5 pm when an appropriate level in the cloud is used for comparison (see below).
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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/m1/1/: accessed April 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.