Arctic Sea Ice Drift Measured by Shipboard Marine Radar

B. Lund, H. C. Graber, P. O.G. Persson, M. Smith, M. Doble, J. Thomson, P. Wadhams

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)4298-4321
Number of pages24
JournalJournal of Geophysical Research: Oceans
Volume123
Issue number6
DOIs
StatePublished - Jun 1 2018

Keywords

  • air/sea/ice exchange processes
  • Dynamics
  • Ice mechanics
  • Instruments and techniques
  • Remote sensing
  • Sea ice

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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  • Cite this

    Lund, B., Graber, H. C., Persson, P. O. G., Smith, M., Doble, M., Thomson, J., & Wadhams, P. (2018). Arctic Sea Ice Drift Measured by Shipboard Marine Radar. Journal of Geophysical Research: Oceans, 123(6), 4298-4321. https://doi.org/10.1029/2018JC013769