Spring and Early Summer Changes in Sea Ice Floe Characteristics in the Beaufort Sea

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• Dr. Takashi Kikuchi, Director of Institute of Arctic Climate and Environment research, Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology. (IACE/RIGC/JAMSTEC)
• Friday 08 November 2024, 16:00-16:30
• British Antarctic Survey, Seminar Room 2.

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This study examined sea ice floe size and other characteristics from March to June in the Beaufort Sea of the Arctic Ocean. We utilized MODIS band-1 visible satellite imagery, which offers high-resolution data (~250 m). Each sea ice floe was extracted using open-source image analysis software (ImageJ), allowing us to estimate floe size, kurtosis, and skewness. Based on this information, we estimated the floe size distribution parameter (α) for each image using the methods of Rothrock and Thorndike [1984] and Toyoda et al. [2001]. To understand changes in sea ice floe characteristics, we conducted two types of analysis: a Lagrangian analysis following buoy trajectories and an Eulerian analysis in the area near Point Barrow, Alaska, USA . The results of both analyses clearly indicate that before melting progressed, the sea ice began to break up, becoming smaller in size and rounder in shape. These findings contribute to our understanding of the mechanisms driving sea ice loss and may aid in the development of sea ice forecasting models.

This talk is part of the British Antarctic Survey series.

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