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<p>In recent years, research investigations have focused on the substantial freshwater storage in the Beaufort Gyre (BG) region due to climate change. Despite active mesoscale eddies in the area, a notable gap in understanding the three-dimensional structure and induced transport has been observed. This study concentrates on the Canada Basin in the western Arctic Ocean, specifically examining a subsurface anticyclonic eddy (SAE) sampled by a Mooring A in the BG region. Hybrid Coordinate Ocean Model (HYCOM) analysis data reveal its lifecycle from February 15 to March 15, 2017, marked by initiation, development, maturity, decay, and termination stages. This work extends the finding of SAE passing through Mooring A by examining its overall effects, spatiotemporal variations, and swirl transport. SAE generation through baroclinic instability, which contributes to the westward tilt of the vertical axis, is also confirmed in this study. Swirl transport induced by SAE is predominantly eastward and downward due to its trajectory and background flow. SAE temporarily weakens stratification and extends the subsurface depth but demonstrates transient effects. Moreover, SAE transports upper-layer freshwater, Pacific Winter Water, and Atlantic Water downward, emphasizing its potential influence on freshwater redistribution in the Canadian Basin. This research provides valuable insights into mesoscale eddy dynamics, revealing their role in modulating the upper water mass in the BG region.</p>

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Daily Evolution of Three-Dimensional Structure of a Subsurface Anticyclonic Eddy and Eddy-Induced Swirl Transport in the Canada Basin

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Fan Xu,
  • Haiyan Li,
  • Ru Wang,
  • Zhiqiang Wen,
  • Kun Yang,
  • Menghao Zhang

摘要

In recent years, research investigations have focused on the substantial freshwater storage in the Beaufort Gyre (BG) region due to climate change. Despite active mesoscale eddies in the area, a notable gap in understanding the three-dimensional structure and induced transport has been observed. This study concentrates on the Canada Basin in the western Arctic Ocean, specifically examining a subsurface anticyclonic eddy (SAE) sampled by a Mooring A in the BG region. Hybrid Coordinate Ocean Model (HYCOM) analysis data reveal its lifecycle from February 15 to March 15, 2017, marked by initiation, development, maturity, decay, and termination stages. This work extends the finding of SAE passing through Mooring A by examining its overall effects, spatiotemporal variations, and swirl transport. SAE generation through baroclinic instability, which contributes to the westward tilt of the vertical axis, is also confirmed in this study. Swirl transport induced by SAE is predominantly eastward and downward due to its trajectory and background flow. SAE temporarily weakens stratification and extends the subsurface depth but demonstrates transient effects. Moreover, SAE transports upper-layer freshwater, Pacific Winter Water, and Atlantic Water downward, emphasizing its potential influence on freshwater redistribution in the Canadian Basin. This research provides valuable insights into mesoscale eddy dynamics, revealing their role in modulating the upper water mass in the BG region.