Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Monitoring the optical turbulence in the surface layer at Dome C,
  Antarctica, with sonic anemometers   The optical turbulence above Dome C in winter is mainly concentrated in the
first tens of meters above the ground. Properties of this so-called surface
layer (SL) were investigated during the period 2007-2012 by a set of sonics
anemometers placed on a 45 m high tower. We present the results of this
long-term monitoring of the refractive index structure constant Cn2 within the
SL, and confirm its thickness of 35m. We give statistics of the contribution of
the SL to the seeing and coherence time. We also investigate properties of
large scale structure functions of the temperature and show evidence of a
second inertial zone at kilometric spatial scales.

11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics