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| DOI | 10.3389/fclim.2024.1338556 |
| Alkaline mineral addition to anoxic to hypoxic Baltic Sea sediments as a potentially efficient CO2-removal technique | |
| 发表日期 | 2024 |
| EISSN | 2624-9553 |
| 起始页码 | 6 |
| 卷号 | 6 |
| 英文摘要 | Recent studies have begun to explore the potential of enhanced benthic weathering (EBW) in the Baltic Sea as a measure for climate change mitigation. To augment the understanding of EBW under seasonally changing conditions, this study aims to investigate weathering processes under anoxia to hypoxia in corrosive bottom waters, which reflect late summer conditions in the Baltic Sea. Dunite and calcite were added to sediment cores retrieved from Eckernf & ouml;rde Bay (Western Baltic Sea) with a constant flow-through of deoxygenated, CO2-enriched Baltic Sea bottom water. The addition of both materials increased benthic alkalinity release by 2.94 mu mol cm(-2) d(-1) (calcite) and 1.12 mu mol cm(-2) d(-1) (dunite), compared to the unamended control experiment. These excess fluxes are significantly higher than those obtained under winter conditions. The comparison with bottom water oxygen concentrations emphasizes that highest fluxes of alkalinity were associated with anoxic phases of the experiment. An increase in Ca and Si fluxes showed that the enhanced alkalinity fluxes could be attributed to calcite and dunite weathering. First order rate constants calculated based on these data were close to rates published in previous studies conducted under different conditions. This highlights the suitability of these proxies for mineral dissolution and justifies the use of these rate constants in modeling studies investigating EBW in the Baltic Sea and areas with similar chemical conditions. Generally stable pH profiles over the course of the experiment, together with the fact that the added minerals remained on the sediment surface, suggest that corrosive bottom waters were the main driving factor for the dissolution of the added minerals. These factors have important implications for the choice of mineral and timing for EBW as a possible marine carbon dioxide removal method in seasonally hypoxic to anoxic regions of the Baltic Sea. |
| 英文关键词 | enhanced benthic weathering; carbon sequestration; dunite and carbonate dissolution; micro-profiles; anoxia; hypoxia |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Environmental Sciences ; Environmental Studies |
| WOS记录号 | WOS:001162880300001 |
| 来源期刊 | FRONTIERS IN CLIMATE
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304843 |
| 作者单位 | Helmholtz Association; GEOMAR Helmholtz Center for Ocean Research Kiel; University of Kiel; Utrecht University |
| 推荐引用方式 GB/T 7714 | . Alkaline mineral addition to anoxic to hypoxic Baltic Sea sediments as a potentially efficient CO2-removal technique[J],2024,6. |
| APA | (2024).Alkaline mineral addition to anoxic to hypoxic Baltic Sea sediments as a potentially efficient CO2-removal technique.FRONTIERS IN CLIMATE,6. |
| MLA | "Alkaline mineral addition to anoxic to hypoxic Baltic Sea sediments as a potentially efficient CO2-removal technique".FRONTIERS IN CLIMATE 6(2024). |
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