Early Pleistocene Orbital-Scale Variability in Australian Northwest Shelf Sediments
文献类型：期刊论文
| 作者 | Zhao, Song3,4,5; Grant, Katharine M.5; Heslop, David5; Gallagher, Stephen J.2; Bolton, Clara T.6; Auer, Gerald1 |
| 刊名 | PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
 |
| 出版日期 | 2024-10-01 |
| 卷号 | 39期号:10页码:24 |
| ISSN号 | 2572-4517 |
| DOI | 10.1029/2024PA005015 |
| 英文摘要 | Paleoclimate proxy records from regions sensitive to humidity/aridity extremes provide crucial insights into the natural forcing mechanisms underlying long-term climate variability in broader regions. One such area is Northwest Australia, where the Australian monsoon impacts its northernmost fringes, which are bordered by the Great Sandy Desert inland. Marine sediments from the Australian Northwest Shelf record fluvial run-off and eolian dust input during the wet and dry seasons, respectively. The location is therefore ideal for investigating long-term variability in the Australian monsoon and Northwest Australian dust flux over orbital timescales. However, there are few continuous, high-resolution paleoclimate records from this region spanning the early Pleistocene, when strong ice-climate feedbacks of the late Pleistocene did not yet dominate global climate. Here, we present geochemical and environmental magnetic proxy records that reveal %CaCO3 and dust-flux variability between 2.9 and 1.6 million years (Myr) ago from International Ocean Discovery Program Expedition 356 Site U1464 on the Australian Northwest Shelf. We establish a new, orbitally-tuned chronology for Site U1464, primarily based on similar to 400 thousand year (kyr) eccentricity cyclicity in %CaCO3, and observe strong obliquity variability (41 and 54 kyr periodicities) but almost no precession signal in the dust-flux records. We propose that the 41 kyr cycle in Northwest Australian dust flux could be a linear response to East Asian winter monsoon intensity and/or the summer inter-tropical insolation gradient (SITIG), whereas the 54 kyr cyclicity might be a non-linear response to obliquity amplitude modulation via the SITIG effect on the cross-equatorial atmospheric circulations. This study establishes a new orbitally-constrained chronology for International Ocean Discovery Program Site U1464 Australian Northwest shelf sediments preserve similar to 400 kyr eccentricity cycles in %CaCO3 and similar to 41 kyr obliquity cycles in dust proxy records Obliquity in Northwest Australian dust flux may be related to the East Asian winter monsoon and summer inter-tropical insolation gradient |
| WOS研究方向 | Geology ; Oceanography ; Paleontology |
| 语种 | 英语 |
| WOS记录号 | WOS:001335498100001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/81240]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Zhao, Song |
| 作者单位 | 1.Karl Franzens Univ Graz, Dept Earth Sci, NAWI Graz Geoctr, Graz, Austria 2.Univ Melbourne, Sch Geog Earth & Atmospher Sci, Melbourne, Vic, Australia 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 5.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia 6.Aix Marseille Univ, CNRS, IRD, INRAE,CEREGE, Aix En Provence, France |
| 推荐引用方式 GB/T 7714 | Zhao, Song,Grant, Katharine M.,Heslop, David,et al. Early Pleistocene Orbital-Scale Variability in Australian Northwest Shelf Sediments[J]. PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,2024,39(10):24. |
| APA | Zhao, Song,Grant, Katharine M.,Heslop, David,Gallagher, Stephen J.,Bolton, Clara T.,&Auer, Gerald.(2024).Early Pleistocene Orbital-Scale Variability in Australian Northwest Shelf Sediments.PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY,39(10),24. |
| MLA | Zhao, Song,et al."Early Pleistocene Orbital-Scale Variability in Australian Northwest Shelf Sediments".PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY 39.10(2024):24. |
入库方式： OAI收割
来源：广州地球化学研究所
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