Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fluctuations in Arctic Sea Ice Extent: Comparing Observations and
  Climate Models   The fluctuation statistics of the observed sea ice extent during the
satellite era are compared with model output from CMIP5 models using a
multi-fractal time series method. The two robust features of the observations
are that on annual to bi-annual time scales the ice extent exhibits white noise
structure and there is a decadal scale trend associated with the decay of the
ice cover. It is shown that (i) there is a large inter-model variability in the
time scales extracted from the models, (ii) none of the models exhibit the
decadal time scales found in the satellite observations, (iii) {5} of the 21
models examined exhibit the observed white noise structure, and (iv) the
multi-model ensemble mean exhibits neither the observed white noise structure
nor the observed decadal trend. It is proposed that the observed fluctuation
statistics produced by this method serve as an appropriate test bed for
modeling studies.

2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex