Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial inhomogeneities in the sedimentation of biogenic particles in
  ocean flows: analysis in the Benguela region   Sedimentation of particles in the ocean leads to inhomogeneous horizontal
distributions at depth, even if the release process is homogeneous. We study
this phenomenon considering a horizontal sheet of sinking particles immersed in
an oceanic flow, and determine how the particles are distributed when they
sediment on the seabed (or are collected at a given depth). The study is
performed from a Lagrangian viewpoint attending to the properties of the
oceanic flow and the physical characteristics (size and density) of typical
biogenic sinking particles. Two main processes determine the distribution, the
stretching of the sheet caused by the flow and its projection on the surface
where particles accumulate. These mechanisms are checked, besides an analysis
of their relative importance to produce inhomogeneities, with numerical
experiments in the Benguela region. Faster (heavier or larger) sinking
particles distribute more homogeneously than slower ones.

5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph