globalchange  > 气候减缓与适应
DOI: 10.1029/2018JC013769
Scopus记录号: 2-s2.0-85048071855
论文题名:
Arctic Sea Ice Drift Measured by Shipboard Marine Radar
作者: Lund B.; Graber H.C.; Persson P.O.G.; Smith M.; Doble M.; Thomson J.; Wadhams P.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期:6
起始页码: 4298
结束页码: 4321
语种: 英语
英文关键词: air/sea/ice exchange processes ; Dynamics ; Ice mechanics ; Instruments and techniques ; Remote sensing ; Sea ice
英文摘要: This study presents Arctic sea ice drift fields measured by shipboard marine X-band radar (MR). The measurements are based on the maximum cross correlation between two sequential MR backscatter images separated ∼1 min in time, a method that is commonly used to estimate sea ice drift from satellite products. The advantage of MR is that images in close temporal proximity are readily available. A typical MR antenna rotation period is ∼1–2 s, whereas satellite revisit times can be on the order of days. The technique is applied to ∼4 weeks of measurements taken from R/V Sikuliaq in the Beaufort Sea in the fall of 2015. The resulting sea ice velocity fields have ∼500 m and up to ∼5 min resolution, covering a maximum range of ∼4 km. The MR velocity fields are validated using the GPS-tracked motion of Surface Wave Instrument Float with Tracking (SWIFT) drifters, wave buoys, and R/V Sikuliaq during ice stations. The comparison between MR and reference sea ice drift measurements yields root-mean-square errors from 0.8 to 5.6 cm s−1. The MR sea ice velocity fields near the ice edge reveal strong horizontal gradients and peak speeds > 1 m s−1. The observed submesoscale sea ice drift processes include an eddy with ∼6 km diameter and vorticities <–2 (normalized by the Coriolis frequency) as well as converging and diverging flow with normalized divergences <–2 and >1, respectively. The sea ice drift speed correlates only weakly with the wind speed (r2 = 0.34), which presents a challenge to conventional wisdom. © 2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113774
Appears in Collections:气候减缓与适应

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作者单位: Department of Ocean Sciences, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Center for Southeastern Tropical Advanced Remote Sensing, University of Miami, Miami, FL, United States; ESRL Physical Sciences Division, National Oceanic and Atmospheric Administration, Boulder, CO, United States; Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Polar Scientific Limited, Dallens, Appin, United Kingdom; Department of Applied Mathematics and Theoretical Physics, Cambridge University, Cambridge, United Kingdom

Recommended Citation:
Lund B.,Graber H.C.,Persson P.O.G.,et al. Arctic Sea Ice Drift Measured by Shipboard Marine Radar[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(6)
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