The Okhotsk coast of Hokkaido, Japan, has a long history of sea ice formation. This has shaped the lives of people living there. The ice's behavior is not just a local thing. It's influenced by big weather patterns in the North Pacific. To understand these changes, researchers have put together a long record of sea ice observations. This record goes back to the 1890s. They combined old data from the 1940s, which was already out there, with new data that had never been shared before. This new data came from old handwritten reports and sketches. These were stored in the Abashiri Local Meteorological Office.

The team digitized the data. They turned old sightings of ice into a continuous record. This record shows the first and last dates of sea ice each year. It also shows daily changes. This effort gives a clear picture of how sea ice has changed over time. But there's a gap. After 2021, there's no data on the last day of drifting ice each year. To fix this, the researchers used satellite data. They created a new way to fill in the missing information.

Why does this matter? Well, understanding sea ice changes helps us see how the climate is shifting. It's not just about the Okhotsk Sea. It's about the whole North Pacific region. This record is a valuable tool. It helps scientists study long-term climate patterns. It's a piece of the puzzle in understanding our changing world.

Sea ice is more than just frozen water. It's a part of the local culture and economy. It affects fishing, transportation, and even tourism. Changes in sea ice can have big impacts on the people who live there. That's why this record is so important. It's not just about the past. It's about the future too. It helps us prepare for what's to come.

Okhotsk's Frozen Past: Unveiling a Century of Sea Ice Changes

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