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<p>Submesoscale eddies play a crucial role in the transport of energy and plankton in the upper ocean despite their small size and short life cycles. However, their dynamics in the coastal waters of the Kamchatka Peninsula and the northern Kuril Islands remain poorly understood. Based on an analysis of over 4500 satellite radar and optical images collected from 2015 to 2024, more than 1100 eddies with diameters up to 24&#xa0;km were identified. Cyclonic eddies with diameters of 2–4&#xa0;km dominated, comprising approximately 80% of all detected structures. Most submesoscale eddies were observed on the shelf, with the highest occurrence in the northern parts of the Kronotsky and Avacha Bays. The highest eddy activity occurred in June. Approximately 40% of shelf eddies formed during spring tides when tidal currents enhanced the shear instability of background flow. Results demonstrate the influence of submesoscale eddies on chlorophyll-<i>a</i> distribution and their potential role in supporting the feeding base of juvenile walleye pollock.</p>

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Submesoscale eddies in the Pacific Ocean off the Kamchatka Peninsula and the northern Kuril Islands: 10 years of satellite observations

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Alexey Zimin,
  • Oksana Atadzhanova,
  • Aleksandr Konik,
  • Dmitry Romanenkov,
  • Aleksandr Varkentin,
  • Egor Svergun,
  • Aleksei Makhovikov,
  • Mikhail Vrublevsky

摘要

Submesoscale eddies play a crucial role in the transport of energy and plankton in the upper ocean despite their small size and short life cycles. However, their dynamics in the coastal waters of the Kamchatka Peninsula and the northern Kuril Islands remain poorly understood. Based on an analysis of over 4500 satellite radar and optical images collected from 2015 to 2024, more than 1100 eddies with diameters up to 24 km were identified. Cyclonic eddies with diameters of 2–4 km dominated, comprising approximately 80% of all detected structures. Most submesoscale eddies were observed on the shelf, with the highest occurrence in the northern parts of the Kronotsky and Avacha Bays. The highest eddy activity occurred in June. Approximately 40% of shelf eddies formed during spring tides when tidal currents enhanced the shear instability of background flow. Results demonstrate the influence of submesoscale eddies on chlorophyll-a distribution and their potential role in supporting the feeding base of juvenile walleye pollock.