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<p>Socio-economical activities around the Okhotsk coast of Hokkaido, Japan are strongly influenced by local sea ice variations, which are determined by larger-scale atmospheric drivers in the North Pacific. Here, we constructed the long-term sea ice observational data from the 1890s by combining data from the 1940s, already released by the Japan Meteorological Agency prior to this study, with further data shared for the first time in this study. For this purpose, old hand-written reports and sketches stored in the Abashiri Local Meteorological Office were investigated. For each year, first and last sea ice dates and daily sea ice variations recorded visually by sighting the ice were digitized to provide continuous time series to the present. In addition, we introduced a new reconstruction approach from satellite data for the date of last annual drift ice occurrence, for which observations are lacking after 2021. The data presented here are of value in understanding the long-term climate variability in the Sea of Okhotsk and the North Pacific.</p>

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Sea ice records over more than a century at an observatory facing the Okhotsk coast of Hokkaido, Japan

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月13日

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  • Takahiro Toyoda,
  • Kento Tsukagawa,
  • Yusuke Kimura,
  • Honoka Abe,
  • Meiji Honda,
  • Yuki Yamada,
  • Miku Amano,
  • Yoshihiro Tachibana,
  • Yuka Sawa,
  • Keisuke Morimoto,
  • Hiroaki Ueda,
  • Katsushi Iwamoto,
  • Kimihiro Itoh,
  • Fumitake Shido,
  • Hitoshi Tada,
  • Hideki Kaneko,
  • Katsuya Toyama,
  • Naohiro Kosugi,
  • Yusuke Ushijima,
  • Masao Ishii

摘要

Socio-economical activities around the Okhotsk coast of Hokkaido, Japan are strongly influenced by local sea ice variations, which are determined by larger-scale atmospheric drivers in the North Pacific. Here, we constructed the long-term sea ice observational data from the 1890s by combining data from the 1940s, already released by the Japan Meteorological Agency prior to this study, with further data shared for the first time in this study. For this purpose, old hand-written reports and sketches stored in the Abashiri Local Meteorological Office were investigated. For each year, first and last sea ice dates and daily sea ice variations recorded visually by sighting the ice were digitized to provide continuous time series to the present. In addition, we introduced a new reconstruction approach from satellite data for the date of last annual drift ice occurrence, for which observations are lacking after 2021. The data presented here are of value in understanding the long-term climate variability in the Sea of Okhotsk and the North Pacific.