Regional differences in sediment oxygen uptake rates in polymetallic nodule and co-rich polymetallic crust mining areas of the Pacific Ocean

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2024-04-05 DOI:10.1016/j.dsr.2024.104295
Sung-Uk An , Ju-Wook Baek , Sung-Han Kim , Hyun-Min Baek , Jae Seong Lee , Kyung-Tae Kim , Kyeong Hong Kim , Kiseong Hyeong , Sang-Bum Chi , Chan Hong Park
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Abstract

The potential impact of manganese mining on benthic remineralization in the Pacific Ocean was assessed in this study. We estimated total sediment oxygen uptake rates (TOU) using in situ autonomous benthic chambers at the polymetallic nodule and Co-rich polymetallic crust mining sites of Korea: at the Clarion-Clipperton Fracture Zone (PILOT site) in the eastern Pacific and the open-sea seamounts (OSM) 9-1 and OSM17 in the western Pacific, respectively. The TOU rates in the shallow seamount areas (0.58 ± 0.01–2.22 ± 0.04 mmol O2 m−2 d−1) were significantly higher than in the PILOT station (0.21 ± 0.05 mmol O2 m−2 d−1), indicating that relatively labile organic matter could be deposited according to the regional oceanographic features and water depth. The highest TOU found among the seamount areas was in the wide summit area at OSM9-1, which may be due to environmental conditions such as seasonal wind-driven mixing, upwelling around the seamount slope, and topography, which can increase productivity seasonally. Our findings suggest that organic carbon quality and hydrodynamics can be closely linked to benthic carbon mineralization in the targeted polymetallic mining areas of the Pacific.

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太平洋多金属结核和共富多金属结壳矿区沉积物摄氧量的区域差异
本研究评估了锰矿开采对太平洋底栖生物再矿化的潜在影响。我们在韩国的多金属结核和富钴多金属结壳矿区(分别位于东太平洋的克拉里昂-克利珀顿断裂带(PILOT矿区)和西太平洋的公海海山(OSM)9-1和OSM17)使用原位自主底栖室估算了沉积物总摄氧率(TOU)。浅海海山区域的 TOU 率(0.58±0.01-2.22±0.04 mmol O2 m-2 d-1)明显高于 PILOT 站(0.21±0.05 mmol O2 m-2 d-1),表明相对易变的有机物可根据区域海洋特征和水深沉积。在海山区域中,TOU 最高的是 OSM9-1 的宽顶区,这可能是由于季节性风驱动的混合、海山斜坡周围的上升流和地形等环境条件,这些都会季节性地提高生产力。我们的研究结果表明,有机碳的质量和水动力与太平洋目标多金属采矿区的底栖碳矿化密切相关。
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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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