Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dissipative Quasigeostrophic Motion under Temporally Almost Periodic
  Forcing   The full nonlinear dissipative quasigeostrophic model is shown to have a
unique temporally almost periodic solution when the wind forcing is temporally
almost periodic under suitable constraints on the spatial square-integral of
the wind forcing and the $\beta$ parameter, Ekman number, viscosity and the
domain size. The proof involves the pullback attractor for the associated
nonautonomous dynamical system.

16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph