  We introduce new adjustments and advances in space-borne 3D volumetric
scattering-tomography of cloud micro-physics. The micro-physical properties
retrieved are the liquid water content and effective radius within a cloud. New
adjustments include an advanced perspective polarization imager model, and the
assumption of 3D variation of the effective radius. Under these assumptions, we
advanced the retrieval to yield results that (compared to the simulated
ground-truth) have smaller errors than the prior art. Elements of our
advancement include initialization by a parametric horizontally-uniform
micro-physical model. The parameters of this initialization are determined by a
grid search of the cost function. Furthermore, we added viewpoints
corresponding to single-scattering angles, where polarization yields enhanced
sensitivity to the droplet micro-physics (i.e., the cloudbow region). In
addition, we introduce an optional adjustment, in which optimization of the
liquid water content and effective radius are separated to alternating periods.
The suggested initialization model and additional advances have been evaluated
by retrieval of a set of large-eddy simulation clouds.
