Large-Scale Comparison Between Buoy and SSM/I Drift and Deformation in the Eurasian Basin during Winter 1992-1993
A method for comparing sea ice velocity, divergence and shear at the large-scale between buoys and SSM/I is presented. For initial testing, the method is applied in the Eurasian Basin because of its relatively simple circulation dominated by the wind. Using 8 ARGOS buoys, 11 strain-rate arrays 100 t...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2000
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.24.1925 http://www.cis.udel.edu/~chandra/sigai/JGR2000.ps |
| Summary: | A method for comparing sea ice velocity, divergence and shear at the large-scale between buoys and SSM/I is presented. For initial testing, the method is applied in the Eurasian Basin because of its relatively simple circulation dominated by the wind. Using 8 ARGOS buoys, 11 strain-rate arrays 100 to 600 km in size are constructed. Daily 100 km resolution sea ice motion derived from SSM/I 85 GHz brightness temperatures is sampled 100 to 1000 km from the center of the buoy arrays. Over this range of possible scales, a minimum RMS dierence for deformation is used to identify an optimal inclusion radius of 600 km corresponding to a length scale of 1000 km. This length scale is typical of local storms conrming a strong connection between wind and observed sea ice motion. Based on all 11 arrays, an average RMS dierence of 2.48 0.05 cm s 1 for velocity vector and 8.8 0.9 10 8 s 1 using all 4 deformation components (@u i =@x j ) is found at the optimal inclusion radius corresponding to average correlation coecients of 0.896 0.002 and 0.729 0.030, respectively. RMS dierences are found to scale with the temporal and spatial uncertainties of the SSM/I suggesting that even better results can be achieved with higher resolution instruments. |
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