Giant diatom blooms driven by deep water upwelling since late MIS3? Evidence from the rim of the Mariana Trench

IF 2.8 2区生物学 Q1 MARINE & FRESHWATER BIOLOGY

Frontiers in Marine Science Pub Date : 2025-05-14 DOI:10.3389/fmars.2025.1556799

Junyu Lin, Dong Xu, Yue Li, Liming Ye, Qian Ge, Yeping Bian, Xibin Han, Weiyan Zhang, Shenghui Cheng

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Abstract

Laminated Diatom Mats (LDMs) in the low-latitude Western Pacific provide key insights into global climate and carbon cycling. While Ethmodiscus rex (E. rex) LDMs research has advanced, two critical aspects remain to be elucidated: (1) the precise chronology of LDMs formation, and (2) its relationship with oceanic circulation patterns and associated nutrient flux variations. In this study, we employed AMS 14C dating coupled with carbonate content variations to constrain the formation age of LDMs, complemented by comprehensive geochemical and clay mineral analyses of core E20, we found: (1) Diatom blooms occurred mainly from Last Glacial Maximum (LGM) to early Holocene; (2) Sediments are mostly volcanic, with increased material in E. rex layers suggesting stronger deep currents transported volcanic debris; (3) Blooms weren’t solely caused by Asian dust-derived nutrients. We propose deep current intensification and topographic upwelling drove diatom growth, highlighting deep ocean processes’ role in surface productivity and LDMs formation. This advances understanding of their climate and carbon cycle significance.

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自MIS3晚期以来，由深水上涌驱动的巨大硅藻华？马里亚纳海沟边缘的证据

低纬度西太平洋的层压硅藻垫（ldm）为了解全球气候和碳循环提供了关键的见解。虽然黄斑蝶ldm的研究取得了进展，但仍有两个关键方面有待阐明：(1)ldm形成的精确年代学；(2)ldm与海洋环流模式和相关营养通量变化的关系。利用AMS - 14C测年法结合碳酸盐含量变化对E20岩心硅藻华的形成年龄进行了限定，并对E20岩心进行了综合地球化学和粘土矿物分析，结果表明：(1)硅藻华主要发生在末次盛冰期至全新世早期；(2)沉积层以火山碎屑为主，雷克斯暴龙沉积层中物质增加，表明深部流携带火山碎屑较强；(3)藻华不仅仅是由亚洲沙尘衍生的营养物质引起的。我们提出深海洋流增强和地形上升流驱动硅藻生长，强调深海过程在地表生产力和ldm形成中的作用。这促进了对它们的气候和碳循环意义的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Frontiers in Marine Science Agricultural and Biological Sciences-Aquatic Science

CiteScore

5.10

自引率

16.20%

发文量

2443

审稿时长

14 weeks

期刊介绍： Frontiers in Marine Science publishes rigorously peer-reviewed research that advances our understanding of all aspects of the environment, biology, ecosystem functioning and human interactions with the oceans. Field Chief Editor Carlos M. Duarte at King Abdullah University of Science and Technology Thuwal is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers, academics, policy makers and the public worldwide. With the human population predicted to reach 9 billion people by 2050, it is clear that traditional land resources will not suffice to meet the demand for food or energy, required to support high-quality livelihoods. As a result, the oceans are emerging as a source of untapped assets, with new innovative industries, such as aquaculture, marine biotechnology, marine energy and deep-sea mining growing rapidly under a new era characterized by rapid growth of a blue, ocean-based economy. The sustainability of the blue economy is closely dependent on our knowledge about how to mitigate the impacts of the multiple pressures on the ocean ecosystem associated with the increased scale and diversification of industry operations in the ocean and global human pressures on the environment. Therefore, Frontiers in Marine Science particularly welcomes the communication of research outcomes addressing ocean-based solutions for the emerging challenges, including improved forecasting and observational capacities, understanding biodiversity and ecosystem problems, locally and globally, effective management strategies to maintain ocean health, and an improved capacity to sustainably derive resources from the oceans.