sea-ice deformation in a coupled ocean–sea-ice model and in satellite remote sensing data
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2017
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Abstract
A realistic representation of sea-ice deformation in models is important for
accurate simulation of the sea-ice mass balance. Simulated sea-ice
deformation from numerical simulations with 4.5, 9, and 18 km horizontal
grid spacing and a viscous–plastic (VP) sea-ice rheology are compared with
synthetic aperture radar (SAR) satellite observations (RGPS, RADARSAT
Geophysical Processor System) for the time period 1996–2008. All three
simulations can reproduce the large-scale ice deformation patterns, but
small-scale sea-ice deformations and linear kinematic features (LKFs) are not
adequately reproduced. The mean sea-ice total deformation rate is about
40 % lower in all model solutions than in the satellite observations,
especially in the seasonal sea-ice zone. A decrease in model grid spacing,
however, produces a higher density and more localized ice deformation
features. The 4.5 km simulation produces some linear kinematic features, but
not with the right frequency. The dependence on length scale and probability
density functions (PDFs) of absolute divergence and shear for all three model
solutions show a power-law scaling behavior similar to RGPS observations,
contrary to what was found in some previous studies. Overall, the 4.5 km
simulation produces the most realistic divergence, vorticity, and shear when
compared with RGPS data. This study provides an evaluation of high and
coarse-resolution viscous–plastic sea-ice simulations based on spatial
distribution, time series, and power-law scaling metrics.
| Reference Key |
spreen2017thesea-ice
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|---|---|
| Authors | ;G. Spreen;G. Spreen;R. Kwok;D. Menemenlis;A. T. Nguyen;A. T. Nguyen |
| Journal | journal of applied polymer science |
| Year | 2017 |
| DOI |
10.5194/tc-11-1553-2017
|
| URL | |
| Keywords |
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