The relation between Arctic sea ice surface elevation and draft: A case study using coincident AUV sonar and airborne scanning laser
| Author(s) | Geiger, Cathleen A. | |
| Author(s) | Wadhams, Peter | |
| Author(s) | Skourup, H. | |
| Author(s) | Doble, M. J. | |
| Ordered Author | Doble, M. J., Skourup, H., Wadhams, P., Geiger, Cathleen A. | |
| UD Author | Geiger, Cathleen A. | |
| Date Accessioned | 2015-05-12T16:49:13Z | |
| Date Available | 2015-05-12T16:49:13Z | |
| Copyright Date | Copyright © 2011 by the American Geophysical Union. | |
| Publication Date | 2011 | |
| Description | Final published version | en_US |
| Abstract | Data are presented from a survey by airborne scanning laser profilometer and an AUV-mounted, upward looking swath sonar in the spring Beaufort Sea. The air-snow (surface elevation) and water-ice (draft) surfaces were mapped at 1 x 1 m resolution over a 300 x 300 m area. Data were separated into level and deformed ice fractions using the surface roughness of the sonar data. The relation (R = d/f) between draft, d, and surface elevation, f, was then examined. Correlation between top and bottom surfaces was essentially zero at full resolution, requiring averaging over patches of at least 11 m diameter to constrain the relation largely because of the significant error (similar to 15 cm) of the laser instrument. Level ice points were concentrated in two core regions, corresponding to level FY ice and refrozen leads, with variations in R attributed primarily to positive snow thickness variability. Deformed ice displayed a more diffuse "cloud," with draft having a more important role in determining R because of wider deformed features underwater. Averaging over footprints similar to satellite altimeters showed the mean surface elevation (typical of ICESat) to be stable with averaging scale, with R = 3.4 (level) and R = 4.2 (deformed). The "minimum elevation within a footprint" characteristic reported for CryoSat was less stable, significantly overestimating R for level ice (R > 5) and deformed ice (R > 6). The mean draft difference between measurements and isostasy suggests 70 m as an isostatic length scale for level ice. The isostatic scale for deformed ice appears to be longer than accessible with these data (>300 m). | en_US |
| Department | University of Delaware. Department of Geography. | |
| Citation | Doble, M. J., H. Skourup, P. Wadhams, and C. A. Geiger (2011), The relation between Arctic sea ice surface elevation and draft: A case study using coincident AUV sonar and airborne scanning laser, J. Geophys. Res., 116, (C00E03), doi:10.1029/2011JC007076. | en_US |
| DOI | 10.1029/2011JC007076 | |
| ISSN | 2169-9275 | |
| URL | http://udspace.udel.edu/handle/19716/16749 | |
| dc.language | English (United States) | |
| Publisher | American Geophysical Union | en_US |
| dc.rights | Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. | |
| dc.source | Journal of Geophysical Research-Oceans | |
| dc.source.uri | http://agupubs.onlinelibrary.wiley.com/agu/jgr/journal/10.1002/%28ISSN%292169-9291/ | |
| Title | The relation between Arctic sea ice surface elevation and draft: A case study using coincident AUV sonar and airborne scanning laser | en_US |
| Type | Article | en_US |