Extracting tidal variability of sea ice concentration from AMSR‐E passive microwave single‐swath data: a case study of the Ross Sea. Issue 3 (14th February 2013)

• Record Type: Journal Article
• Authors: Mack, Stefanie; Padman, Laurie; Klinck, John
• Is Part Of: Geophysical research letters. Volume 40:Issue 3(2013:Feb.)
• Page Start: 547
• Page End: 552
• Publication Date: 2013-02-14
• Subjects: Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/grl.50128
• Languages: English
• ISSNs: 0094-8276

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p id="grl50128-para-0002">[1] The periodic divergence of stress applied by ocean tidal currents to sea ice affects the time‐averaged ice concentration (<italic>C_ice</italic>) and heat and freshwater fluxes at the ocean surface. We demonstrate that, at sufficiently high latitudes, tidal variability in <italic>C_ice</italic> can be extracted from single‐swath data from the Advanced Microwave Scanning Radiometer–EOS (AMSR‐E) satellite passive microwave sensor, although time intervals between swaths are irregular. For the northwest Ross Sea where tidal currents are large, tidal divergence is the dominant cause of <italic>C_ice</italic> variability in winter, with a range of ±0.2 about a mean of ~0.8. Daily‐averaged <italic>C_ice</italic> values vary from &gt;0.9 at neap tides to ~0.7 at spring tides. Variability at the fundamental tidal periods is about half that expected from an inverse barotropic tide model for the Ross Sea, suggesting that the measured tidal signal in <italic>C_ice</italic> may be used to diagnose sea ice mechanical properties and ice/ocean coupling.</p> </abstract>