Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatial statistics of atmospheric particulate matter in China   In this paper, the spatial dynamics of the atmospheric particulate matters
(resp. PM$_{10}$ and PM$_{2.5}$) are studied using turbulence methodologies. It
is found experimentally that the spatial correlation function $\rho(r)$ shows a
log-law on the mesoscale range, i.e., $50\le r\le 500\,{km}$, with an
experimental scaling exponent $\beta=0.45$. The spatial structure function
shows a power-law behavior on the mesoscale range $90\le r\le 500\,{km}$. The
experimental scaling exponent $\zeta(q)$ is convex, showing that the
intermittent correction is relevant in characterizing the spatial dynamic of
particulate matter. The measured singularity spectrum $f(\alpha)$ also shows
its multifractal nature. Experimentally, the particulate matter is more
intermittent than the passive scalar, which could be partially due to the
\red{mesoscale movements} of the atmosphere, and also due to local sources,
such as local industry activities.

9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph