Centennial-millennial scale global climate-linked monsoonal and non-monsoonal changes in the eastern Arabian Sea during the last 42,800 years

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Marine Geology Pub Date : 2024-05-12 DOI:10.1016/j.margeo.2024.107307
Mohmmad Arif Ansari , Arif H. Ansari , Ravi Mishra , Mohammad Arif , Partha Sarathi Jena , Ankur Dabhi , Ravi Bhushan , Dharmendra P. Singh , Abhayanand S. Maurya , Prasanta K. Das , Ishwar Chandra Rahi , Shailesh Agrawal
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Abstract

The Arabian Sea significantly impacts the global climate due to its hosting of one of the largest sedimentary bodies in the Modern Ocean basin and thickest oxygen minimum zone. It makes the study of fine-scale evolutionary changes in the Arabian Sea imperative to address the ongoing challenges in developing a strong and cohesive model for predicting rapid climate change in the future. Therefore, this study carried out environmental magnetic, grain size, stable isotope, total organic carbon (TOC), trace elements (TE), and rare earth elements (REE) investigations on a well-dated 2.68 m long sediment core from the eastern Arabian Sea to understand the fluctuation in monsoon and non-monsoon-driven sediment supply and associated primary productivity changes during the late Quaternary. The careful observations of chronological changes in the investigated parameters concerning coeval major global events enabled us to successfully identify the response of major global climatic events that occurred around 42.8–28 ka, 17 ka, 14.5 ka, 11.7 ka, 9.7 ka, 8.2 ka, 4.6–3.9, and 2–0.6 ka. These global events also played a crucial role in co-regulating the water column oxygen conditions in the Arabian Sea. Comparing our record with a sedimentary record from off Chennai, Bay of Bengal, suggests that opposite variations (anti-phasing) between southwest (SW) monsoon and northeast (NE) monsoon is a post-25 ka phenomenon. Pre-25 ka SW and NE monsoon showed similar variations (same phase), and we speculate that this anti-phasing between the SW and NE monsoon was cyclically driven by the earth's axial precession cycle.

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过去 42 800 年间阿拉伯海东部百年-千年尺度的全球季风和非季风气候变化
阿拉伯海是现代大洋盆地最大的沉积体之一,也是最厚的最小含氧区,因此对全球气候有重大影响。因此,研究阿拉伯海精细尺度的演化变化势在必行,以应对当前为预测未来快速气候变化而开发强大而有凝聚力的模型所面临的挑战。因此,本研究对阿拉伯海东部一个年代久远、长 2.68 米的沉积物岩芯进行了环境磁性、粒度、稳定同位素、总有机碳(TOC)、微量元素(TE)和稀土元素(REE)调查,以了解第四纪晚期季风和非季风驱动的沉积物供应波动以及相关的初级生产力变化。通过仔细观察所调查的参数与同时发生的全球重大事件有关的年代变化,我们成功地确定了发生在 42.8-28 ka、17 ka、14.5 ka、11.7 ka、9.7 ka、8.2 ka、4.6-3.9 和 2-0.6 ka 前后的全球重大气候事件的响应。这些全球性事件在共同调节阿拉伯海水体氧气条件方面也发挥了至关重要的作用。将我们的记录与孟加拉湾钦奈附近的沉积记录相比较,表明西南季风与东北季风之间的相反变化(反相位)是 25 ka 年以后的现象。25 ka年以前的西南季风和东北季风表现出相似的变化(同相),我们推测西南季风和东北季风之间的反相变化是由地球的轴向前倾周期周期性驱动的。
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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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