Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simple geometric approximations for global atmospheres on moderately
  oblate planets   Certain geometric approximations such as the widely used traditional
shallow-atmosphere, spherical-geoid (TSA-SG) and the deep-atmosphere,
spherical-geoid (DA-SG) approximations boil down to the specification of a
spatial metric tensor. In order to eliminate the leading-order errors due to
the SG and TSA approximations, a sequence of three metric geometric
approximations of increasing accuracy at high altitudes is obtained.
  Their metric tensors possess a simple, closed-form analytical expression. The
approximations capture to leading order the oblateness of the planet, the
widening of atmospheric columns with height, the horizontal and vertical
variations of gravity and the non-traditional part of the Coriolis force.
Furthermore, for the first two approximations, the horizontal metric is
conformal (proportional) to the spherical metric, which simplifies analytical
and numerical formulations of the equations of motion.

19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org