| タイトル |
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Biomarker records from core GH02-1030 off Tokachi in the northwestern Pacific over the last 23,000 years: Environmental changes during the last deglaciation
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| 作成者 |
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| アクセス権 |
open access |
| 主題 |
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Other
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North Pacific
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Other
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Japan
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Other
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East Asia
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Other
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biomarker
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Other
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glacial
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Other
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deglacial
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Other
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paleoenvironment
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Other
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paleotemperature
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NDC
452
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| 内容注記 |
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Abstract
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We investigated marine and terrestrial environmental changes at the northern Japan margin in the northwestern Pacific during the last 23,000 years by analyzing biomarkers (alkenones, long-chain n-alkanes, long-chain n-fatty acids, and lignin-derived materials) in Core GH02-1030. The UK'37-derived temperature in the last glacial maximum (LGM) centered at 21 ka was ~10˚C, which was 2˚C lower than the core-top temperature (~12˚C). This small temperature drop does not agree with pollen evidence of a large air temperature drop (more than 4˚C) in the Tokachi area. This disagreement might be attributed to a bias of UK'37-derived temperature within 2.5˚C by a seasonal shift in alkenone production. The UK'37-derived temperature was significantly low during the last deglaciation. Because this cooling was significant in the Kuroshio-Oyashio transition zone, the temperature drops are attributable to the southward displacement of the Kuroshio-Oyashio boundary. Abundant lignin-derived materials, long-chain n-alkanes and long-chain n-fatty acids indicate a higher contribution of terrigenous organic matter from 17 to 12 ka. This phenomenon might have resulted from an enhanced coastal erosion of terrestrial soils due to marine transgression and/or an efficient inflow of higher plant debris to river waters from 17 to 12 ka.
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| 出版者 |
en
Springer
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| 日付 |
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| 言語 |
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| 資源タイプ |
journal article |
| 出版タイプ |
AM |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/51231
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| 関連 |
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isVersionOf
DOI
https://doi.org/10.1007/s10872-009-0070-4
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| 収録誌情報 |
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PISSN
0916-8370
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EISSN
1573-868X
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NCID
AA10833529
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en
Journal of Oceanography
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巻65
号6
開始ページ847
終了ページ858
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| ファイル |
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| コンテンツ更新日時 |
2023-07-26 |
