Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cloud Tomography from Space using MISR and MODIS: Locating the "Veiled
  Core" in Opaque Convective Clouds   For passive satellite imagers, current retrievals of cloud optical thickness
and effective particle size fail for convective clouds with 3D morphology.
Indeed, being based on 1D radiative transfer (RT) theory, they work well only
for horizontally homogeneous clouds. A promising approach for treating clouds
as fully 3D objects is cloud tomography, and this has been demonstrated for
airborne observations. For cloud tomography from space, however, more efficient
forward 3D RT solvers are required. Here, we present a path forward,
acknowledging that optically thick clouds have "veiled cores." Photons
scattered into and out of this deep region do not contribute significant
information to the observed imagery about the inner structure of the cloud. We
investigate the location of the veiled core for the MISR and MODIS imagers.
While MISR provides multi-angle imagery in the visible and near-IR, MODIS
includes channels in the short-wave IR, albeit at a single view angle. This
combination will enable future 3D retrievals to disentangle the cloud's
effective particle size and optical thickness. We find that, in practice, the
veiled core is located at an optical distance of $\approx$5 starting from the
cloud boundary along the line-of-sight. For MODIS' absorbing wavelengths the
veiled core covers a larger volume, starting at smaller optical distances. This
result makes it possible to reduce the number of unknowns for the cloud
tomographic reconstruction, and opens up new ways to increase the efficiency of
the 3D RT solver at the heart of the reconstruction algorithm.

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The categories of this paper are: comp-gas
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The categories of this paper are: econ
9
The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
2
The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an