| 研究課題/領域番号 |
22K14094
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| 研究機関 | 北海道大学 |
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研究代表者 |
MENSAH VIGAN 北海道大学, 低温科学研究所, 特任助教 (10912678)
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| 研究期間 (年度) |
2022-04-01 – 2025-03-31
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| キーワード | ice meltwater / climate change / climatology / multidecadal variability / ice ocean interactions |
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| 研究実績の概要 |
We designed and implemented a new methodology to estimate the amount of ice melting in the Bering Sea from ocean data.
We established a climatology and time series of meltwater volume (MWV), extending from 1950 to 2020, the longest record of a sea-ice thickness related variable.
We evaluated the multidecadal variability of the MWV and found that it has decreased significantly over the Bering shelf since the 1980s. The decrease is especially pronounced in the coastal polynya regions where sea ice is produced.
We established a link between these long-term changes in MWV and changes in stratification over the Bering shelf.
We obtained preliminary results in the Beaufort Sea and Chukchi Sea, suggesting that the recent melting of multi-year ice has considerably increased the MWV in these seas.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The research for this project has led to one manuscript being completed and submitted to the journal "Progress in Oceanography". We could present these results in several conferences in FY2023 both domestically and internationally. The preliminary results in the Beaufort Sea indicate both that the methodology is adapted for this region and that the results are also worthy of publication. We are now going to start refining and further analyzing these results. Lastly, I am also undergoing an estimate of the freshwater volume in the Baffin Bay/Labrador Sea, which is one of the regions where sea ice meltwater from the Pacific Arctic region (Chukchi Sea and Beaufort Sea) outflow.
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| 今後の研究の推進方策 |
The work on the Bering Sea has been completed and a manuscript was submitted in March to Progress in Oceanography.
From now on, we will focus on improving the results in the Beaufort Sea and Chukchi Sea, by updating the methodology to the latest version adopted in the Bering Sea.
The study will be focused on the melting of multiyear ice, and estimating how the varying strength of the Beaufort Gyre and changes in seasonal and multi-year ice contribute to the changes in the volume of meltwater and freshwater in the Beaufort Sea.
This part of the study will be conducted by Ms. Yen-Chen Chen, a PhD. student in our laboratory, who has been a research associate for this Kakenhi project from the start. I will co-supervise her in this research study, as PI of the project.
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| 次年度使用額が生じた理由 |
Initially, we had planned to submit two papers by the end of the fiscal year. One of the papers has indeed been submitted this year, but the review has not been returned to us yet. Also, after discussions with one of our research collaborators, we found it necessary to shift to a more accurate method of analysis for the second paper.
Therefore, the unspent amount (500,000 yen) allocated for the publication fees of these papers was due to the fact that it took longer than planned to write the papers and thus we have to carry over the budget.
In the next fiscal year, we plan to use the unspent funds for the publication fees of the previously submitted paper, and of the second paper to be submitted after completing the update of the analysis.
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