| 研究課題/領域番号 |
20J21145
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| 研究機関 | 東京大学 |
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研究代表者 |
BEHRENS BETHANY 東京大学, 総合文化研究科, 特別研究員(DC1)
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| 研究期間 (年度) |
2020-04-24 – 2023-03-31
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| キーワード | Antarctica / Tasmania / beryllium isotopes / radiocarbon / glacial cycles |
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| 研究実績の概要 |
This year saw excellent progress on analyzing beryllium for samples from Lake Selina, Tasmania. We analyzed 80 samples, extending our dataset to 125 ka BP. The results show interesting trends when compared to ice core greenhouse gas and d18O. As there are few lake studies of beryllium isotopes, this work is quite interesting.
Beryllium analysis has been completed for the kasten core from Sabrina Coast, and 44 samples have been completed for the piston core. We have also begun compound specific radiocarbon analysis on these samples to create an age model. We have also started C/N ratios to better understand the relation between glacial and marine input at this site.
A manuscript for low-res beryllium from the Adelie Basin has been submitted and accepted. High-res beryllium is almost finished
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
This year it was possible to analyze over 150 samples for beryllium isotopes, a rather time-consuming process, and the results look very good. Despite the continued limitations due to coronavirus, it was possible to work with our collaborators for compound specific radiocarbon analysis. This includes sample preparation and meetings to discuss results. A manuscript for low resolution beryllium isotopes from the Adelie Basin, East Antarctica was recently accepted for publication in QSA.
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| 今後の研究の推進方策 |
Beryllium isotope analysis for Lake Selina, Tasmania will continue beyond 125 ka BP to detemine if there are similarities/differences between the Last Glacial Maximum and the Penultimate Glacial Maximum, and perhaps as far back as MIS 7. Grain size analysis will also continue for this core.
Beryllium isotope analysis for the Sabrina Coast will continue. So far we have analyze ~2.5m of a 16 m long core, and we are excited to see what long-term changes we can see with beryllium proxies. We aim to soon finish the C/N ratios, which are half-done.
Experimental analysis on the Adelie Basin samples is nearly finished, with 12 samples remaining for the high-resolution beryllium record.
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