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Characterizing Arctic sea ice topography using high-resolution IceBridge data.

Alek Petty1,2, Michel Tsamados3, Nathan Kurtz2

  • 1Earth System Science Interdisciplinary Center, University of Maryland, College Park, Maryland, USA.

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|August 21, 2020
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Summary
This summary is machine-generated.

Arctic sea ice topography analysis reveals significant spatial variability. Multi-year ice in the Central Arctic drives this variability, showing greater interannual changes than first-year ice.

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Area of Science:

  • Cryospheric science
  • Remote sensing
  • Arctic geophysics

Background:

  • Arctic sea ice is crucial for global climate regulation.
  • Understanding sea ice topography is key to assessing its mass balance and dynamics.
  • Previous studies lacked high-resolution topographic data for detailed analysis.

Purpose of the Study:

  • To analyze Arctic sea ice topography using high-resolution elevation data.
  • To investigate the characteristics and variability of sea ice surface features.
  • To delineate topographic differences between first-year and multi-year ice regimes.

Main Methods:

  • Utilized high-resolution, 3D surface elevation data from NASA's Airborne Topographic Mapper (Operation IceBridge).
  • Developed and applied a novel surface feature picking algorithm to detect and analyze sea ice features.
  • Derived height, volume, and geometry information for sea ice features from 2009-2014.

Main Results:

  • Arctic sea ice topography exhibits significant spatial variability, primarily driven by multi-year ice in the Central Arctic.
  • Multi-year ice topography shows greater interannual variability than first-year ice.
  • Ice topography demonstrates a coastal dependency, with increased feature height and volume near coastlines, and a strong correlation with ice thickness.

Conclusions:

  • Ice deformation variability is critical for the sea ice mass balance.
  • The findings provide crucial data on the ice thickness distribution in the western Arctic.
  • Future research should leverage this dataset for atmospheric form drag calculations.