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Monitoring ice thickness and elastic properties from the measurement of leaky guided waves: A laboratory experiment. | LitMetric

AI Article Synopsis

  • The decline of Arctic sea ice is a clear indicator of global warming, showing an accelerated decrease over the past 40 years, which climate models struggle to predict accurately.
  • To improve these models, precise field data on sea ice thickness and mechanical properties is critical, beyond what current radar and sonar data provide.
  • The study demonstrates a laboratory method for simultaneously measuring ice thickness and mechanical properties using ultrasonic guided waves, achieving high accuracy in the process.

Article Abstract

The decline of Arctic sea ice extent is one of the most spectacular signatures of global warming, and studies converge to show that this decline has been accelerating over the last four decades, with a rate that is not reproduced by climate models. To improve these models, relying on comprehensive and accurate field data is essential. While sea ice extent and concentration are accurately monitored from microwave imagery, an accurate measure of its thickness is still lacking. Moreover, measuring observables related to the mechanical behavior of the ice (such as Young's modulus, Poisson's ratio, etc.) could provide better insights in the understanding of sea ice decline, by completing current knowledge so far acquired mostly from radar and sonar data. This paper aims at demonstrating on the laboratory scale that these can all be estimated simultaneously by measuring seismic waves guided in the ice layer. The experiment consisted of leaving a water tank in a cold room in order to grow an ice layer at its surface. While its thickness was increasing, ultrasonic guided waves were generated with a piezoelectric source, and measurements were subsequently inverted to infer the thickness and mechanical properties of the ice with very good accuracy.

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Source
http://dx.doi.org/10.1121/1.5009933DOI Listing

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