An analytical model for wind-driven Arctic summer sea ice drift
Other literature type, Article
Stewart, A. L.
- Publisher: eScholarship, University of California
(issn: 1994-0424, eissn: 1994-0424)
arxiv: Physics::Geophysics | Physics::Atmospheric and Oceanic Physics | Astrophysics::Earth and Planetary Astrophysics | Physics::Space Physics
The authors present an analytical model for wind-driven free drift of sea
ice that allows for an arbitrary mixture of ice and open water. The model
includes an ice–ocean boundary layer with an Ekman spiral, forced by
transfers of wind-input momentum both through the sea ice and directly into
the open water between the ice floes. The analytical tractability of this
model allows efficient calculation of the ice velocity provided that the
surface wind field is known and that the ocean geostrophic velocity is
relatively weak. The model predicts that variations in the ice thickness or
concentration should substantially modify the rotation of the velocity
between the 10 m winds, the sea ice, and the ocean.
Compared to recent observational data from the first ice-tethered profiler
with a velocity sensor (ITP-V), the model is able to capture the
dependencies of the ice speed and the wind/ice/ocean turning angles on the
wind speed. The model is used to derive responses to intensified southerlies
on Arctic summer sea ice concentration, and the results are shown to compare
closely with satellite observations.