Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonsingular Surface-Quasi-Geostrophic Flow   The dynamics of large eddies in the atmosphere and oceans is described by the
surface quasi geostrophic equation, which is reminiscent of the Euler
equations. Thermal fronts build up rapidly. Two different numerical methods
combined with analytical criteria are used to show there are no singularities
in finite time.

9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci