Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The shallow shelf approximation as a "sliding law" in a
  thermomechanically coupled ice sheet model   The shallow shelf approximation is a better ``sliding law'' for ice sheet
modeling than those sliding laws in which basal velocity is a function of
driving stress. The shallow shelf approximation as formulated by \emph{Schoof}
[2006a] is well-suited to this use. Our new thermomechanically coupled sliding
scheme is based on a plasticity assumption about the strength of the saturated
till underlying the ice sheet in which the till yield stress is given by a
Mohr-Coulomb formula using a modeled pore water pressure. Using this scheme,
our prognostic whole ice sheet model has convincing ice streams. Driving stress
is balanced in part by membrane stresses, the model is computable at high
spatial resolution in parallel, it is stable with respect to parameter changes,
and it produces surface velocities seen in actual ice streams.

12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an