Meridional Shifts of the Southern Hemisphere Westerlies During the Early Cenozoic
文献类型：期刊论文
| 作者 | Chen, Hongjin5; Xu, Zhaokai3,4; Bayon, Germain6; Fan, Qingchao4 ; von Strandmann, Philip A. E. Pogge1; Wang, Wei7; Sun, Tianqi4; Li, Tiegang2
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| 刊名 | GEOPHYSICAL RESEARCH LETTERS
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| 出版日期 | 2024-07-16 |
| 卷号 | 51期号:13页码:12 |
| 关键词 | early Cenozoic IODP expedition 369 Mentelle Basin Southern Hemisphere westerlies chemical weathering |
| ISSN号 | 0094-8276 |
| DOI | 10.1029/2024GL110182 |
| 通讯作者 | Xu, Zhaokai(zhaokaixu@qdio.ac.cn) |
| 英文摘要 | Despite the crucial role of the Southern Hemisphere (SH) westerlies in modulating modern and past climate evolution, little is known about their behavior and possible forcing mechanisms during the early Cenozoic. We probe changes in the hydroclimate of southwest Australia during 62-51 Ma, based on sedimentary proxy records from the International Ocean Discovery Program Site U1514 in the Mentelle Basin. Our results reveal a transition from a less humid climate to wetter conditions at mid-high latitudes starting from the early Eocene, which suggests poleward migration of the SH westerlies. This long-term trend is punctuated by short-lived events of aridification during the Mid-Paleocene Biotic Event and wetter intervals during the Paleocene-Eocene Thermal Maximum, indicating additional short-term meridional shifting of the westerlies. We propose that the evolution of SH westerlies was driven by the equator-to-pole temperature gradient regulated by global warming and ephemeral growth of the Antarctic ice sheet. The Southern Hemisphere (SH) westerlies, which are the dominant atmospheric circulation patterns in the middle latitudes, play a key role in regulating global and regional climate. Currently, the knowledge of past changes in SH westerlies relies mainly on the late Quaternary. Its dynamics over longer timescales, especially under early Cenozoic greenhouse climate states, remain poorly understood. The Mentelle Basin off southwest Australia was located at a more southerly location than at the present day, and was potentially under the influence of SH westerlies. To examine the long-term hydroclimate changes in southwest Australia during the mid-late Paleocene to the early Eocene (62-51 Ma), we measured neodymium and hafnium isotopic compositions of fine-grained detrital sediments from a borehole (IODP Site U1514) drilled in the Mentelle Basin, in addition to clay mineralogy, and elemental abundances. Our results suggest a gradual wetting of southwest Australia since the early Eocene, which we relate to the poleward migration of SH westerlies in response to a reduced latitudinal temperature gradient. An abrupt northward shift of SH westerlies was observed during the short-lived Middle Paleocene Biotic Event (similar to 59 Ma), possibly driven by ephemeral growth of the Antarctica ice sheet. We reconstruct the hydroclimate evolution of southwest Australia during 62-51 Ma The Southern Hemisphere (SH) westerlies remained relatively stable during the mid-late Paleocene and shifted poleward since the early Eocene Processes related to variations of pole-equator temperature gradients drove meridional migration of the SH westerlies |
| WOS关键词 | ND ISOTOPIC COMPOSITION ; HOLOCENE CHANGES ; LATE PALEOCENE ; SEA-LEVEL ; EOCENE ; OCEAN ; HF ; RECORD ; TEMPERATURE ; CLIMATE |
| 资助项目 | National Key Research and Development Program of China[2022YFF0800503] ; National Natural Science Foundation of China (NSFC)[42306089] ; Science and Technology Projects in Guangzhou[SL2023A04J01739] ; Director General's Scientific Research Fund of Guangzhou Marine Geological Survey, China[2023GMGSJZJJ00010] ; French National Research Agency[ANR-20-CE01-0003] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001262098000001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/186335]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 通讯作者 | Xu, Zhaokai |
| 作者单位 | 1.Johannes Gutenberg Univ Mainz, Inst Geosci, Mainz, Germany 2.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Sedimentol & Metallogeny, Qingdao, Peoples R China 3.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 5.China Geol Survey, Minist Nat Resources, Key Lab Marine Mineral Resources, Guangzhou Marine Geol Survey, Guangzhou, Peoples R China 6.Univ Brest, CNRS, Plouzane, France 7.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Hongjin,Xu, Zhaokai,Bayon, Germain,et al. Meridional Shifts of the Southern Hemisphere Westerlies During the Early Cenozoic[J]. GEOPHYSICAL RESEARCH LETTERS,2024,51(13):12. |
| APA | Chen, Hongjin.,Xu, Zhaokai.,Bayon, Germain.,Fan, Qingchao.,von Strandmann, Philip A. E. Pogge.,...&Li, Tiegang.(2024).Meridional Shifts of the Southern Hemisphere Westerlies During the Early Cenozoic.GEOPHYSICAL RESEARCH LETTERS,51(13),12. |
| MLA | Chen, Hongjin,et al."Meridional Shifts of the Southern Hemisphere Westerlies During the Early Cenozoic".GEOPHYSICAL RESEARCH LETTERS 51.13(2024):12. |
入库方式： OAI收割
来源：海洋研究所
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