A 20-kyr record of seawater osmium isotope variations in the Okinawa Trough, a marginal basin in the western Pacific: Implications for climate change
文献类型：期刊论文
| 作者 | Lim, Dhongil1,2; Kim, Jihun1; Yang, Juyeon1; Choi, Sun Min1; Kim, Intae1,2; Kang, Jeongwon1; Xu, Zhaokai3,4; Selby, David5 |
| 刊名 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
 |
| 出版日期 | 2026-05-01 |
| 卷号 | 689页码:11 |
| 关键词 | Osmium isotope Glacial-interglacial variation Continental surface weathering Climate change Okinawa Trough |
| ISSN号 | 0031-0182 |
| DOI | 10.1016/j.palaeo.2026.113676 |
| 通讯作者 | Lim, Dhongil(oceanlim@kiost.ac.kr) ; Xu, Zhaokai(zhaokaixu@qdio.ac.cn) |
| 英文摘要 | We present a high-resolution record of seawater osmium isotope (Os-187/Os-188 ratio) variations over the past similar to 20 kyr from the Okinawa Trough, a marginal basin in the western Pacific. Osmium concentrations range from 53.0 to 166.5 pg g(-1), and Os-187/Os-188 ratios range from 0.993 to 1.073, mostly below the modern seawater average (1.060 +/- 0.010). The record reveals notable shifts (similar to 5-8%) that closely follow glacial-interglacial and millennial-scale climate changes, with lower values during cold periods and higher during warm intervals. This pattern likely reflects a global oceanic Os signature modulated by increased continental weathering and river runoff during warm climates. Notably, the orbital-scale shift was likely driven by enhanced continental Os flux and preferential release of radiogenic Os (Os-187) during deglacial weathering, especially during the B & oslash;lling-Aller & oslash;d warming. Although Chinese rivers discharged directly into the trough during the last glacial lowstand, their influence on seawater Os isotopes was limited (similar to 0.03 shift in Os-187/Os-188). Instead, excursions toward less radiogenic values during the last glacial period and other cold events (i.e., the Younger Dryas and the 4.2-ka cooling) are attributed to increased inflow of relatively unradiogenic North Pacific Intermediate Water, consistent with a global decline in continental Os flux during glacial periods. In the Holocene, significant inputs of unradiogenic hydrothermal Os via renewed Kuroshio Current inflow are also evident. Our study, together with records from other regions, highlights the globally coherent pattern in glacial-interglacial Os isotope shifts, providing evidence for a globally integrated response of continental weathering to climate change. |
| WOS关键词 | INTERMEDIATE WATER VENTILATION ; SOUTH CHINA SEA ; NORTHWESTERN PACIFIC ; PALEOENVIRONMENTAL CHANGE ; SEDIMENT PROVENANCE ; KUROSHIO CURRENT ; HIGH-RESOLUTION ; NORTH PACIFIC ; ASIAN MONSOON ; LAST DEGLACIATION |
| 资助项目 | National Research Foundation of Korea (NRF) , Southh Korea[RS-2024-00346132] ; Korea Institute of Marine Science & Technology Promotion, South Korea[PM64610] ; National Natural Science Foundation of China, China[42576077] ; Laoshan Laboratory[LSKJ202204200] |
| WOS研究方向 | Physical Geography ; Geology ; Paleontology |
| 语种 | 英语 |
| WOS记录号 | WOS:001708946300001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/204991]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Lim, Dhongil; Xu, Zhaokai |
| 作者单位 | 1.Korea Inst Ocean Sci & Technol, Busan 49111, South Korea 2.Univ Sci & Technol, Major Ocean Sci, Daejeon 34113, South Korea 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 4.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China 5.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England |
| 推荐引用方式 GB/T 7714 | Lim, Dhongil,Kim, Jihun,Yang, Juyeon,et al. A 20-kyr record of seawater osmium isotope variations in the Okinawa Trough, a marginal basin in the western Pacific: Implications for climate change[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2026,689:11. |
| APA | Lim, Dhongil.,Kim, Jihun.,Yang, Juyeon.,Choi, Sun Min.,Kim, Intae.,...&Selby, David.(2026).A 20-kyr record of seawater osmium isotope variations in the Okinawa Trough, a marginal basin in the western Pacific: Implications for climate change.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,689,11. |
| MLA | Lim, Dhongil,et al."A 20-kyr record of seawater osmium isotope variations in the Okinawa Trough, a marginal basin in the western Pacific: Implications for climate change".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 689(2026):11. |
入库方式： OAI收割
来源：海洋研究所
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