Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ponderomotive coupling of waves to sea surface currents via horizontal
  density gradients   The mathematical models and numerical simulations reported here are motivated
by satellite observations of horizontal sea surface fluid motions that are
closely coordinated with the vertical motion of waves or, after an
approximation, an envelope of rapidly oscillating waves. This coordination of
fluid movements with wave envelopes tends to occur when strong horizontal
buoyancy gradients are present. The nonlinear models of this coordinated
movement presented here may provide future opportunities for the optimal design
of satellite imagery that could simultaneously capture the dynamics of both
waves and currents directly.
  The models derived here appear first in their unapproximated form, then again
with a slowly varying envelope (SVE) approximation using the WKB approach. The
WKB wave-current-buoyancy interaction model derived here for a free surface
with horizontal buoyancy gradients indicates that the mechanism for these
correlations is the ponderomotive force of the slowly varying envelope of
rapidly oscillating waves acting on the surface currents via the horizontal
buoyancy gradient. In this model, the buoyancy gradient appears explicitly in
the WKB wave momentum, which in turn generates density-weighted potential
vorticity whenever the buoyancy gradient is not aligned with the wave-envelope
gradient.

7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph