Control of surface exposure age on highly reactive iron of atmospheric dust
文献类型：期刊论文
| 作者 | Ouyang, Shenghui2; Zhao, Wancang1; Li, Le3,4 |
| 刊名 | GLOBAL AND PLANETARY CHANGE
 |
| 出版日期 | 2025-09-01 |
| 卷号 | 252页码:8 |
| 关键词 | Asian desert 234U/238U Highly reactive iron Carbon cycle Tibetan Plateau |
| ISSN号 | 0921-8181 |
| DOI | 10.1016/j.gloplacha.2025.104880 |
| 通讯作者 | Li, Le(lile@qdio.ac.cn) |
| 英文摘要 | Highly reactive iron (FeHR) oxyhydroxides in atmosphere dust play a critical role in determining the bioavailability of dust-derived iron in the ocean, thereby exerting substantial control over open-ocean biogeochemistry. However, the FeHR content in atmosphere dust exhibits significant variability across different landscapes, and the underlying factors contributing to this variability remain poorly understood. One hypothesis suggests that the FeHR content is controlled by chemical kinetics, which transform FeHR into more crystallized oxyhydroxides, but quantifying this process at the landscape scale has been challenging. In this study, we investigate potential factors controlling FeHR by analyzing its relationship with surface exposure age (determined by uranium comminution dating), chemical weathering intensity, lithology, and climatic conditions using sediment samples from major Asian deserts. Our results show that the ratio of FeHR to total iron (FeT) exhibits a strong first-order kinetic relationship with surface exposure age, and a weak negative correlation with chemical weathering intensity but no correlation with climatic condition and lithology, suggesting that kinetic process dictated by surface exposure age plays a pivotal role during the transformation of iron species. This finding underscores the significance of cold, rapidly eroding terrains in producing FeHR. The kinetic control of exposure age on iron reactivity may induce a positive feedback loop between atmospheric CO2 levels and glacial activity, potentially contributing to the onset of ice ages and the associated increase in climate variability. |
| WOS关键词 | SEDIMENT TRANSPORT ; TIBETAN PLATEAU ; EOLIAN DEPOSITS ; SOURCE REGION ; OCEAN ; TIME ; PHYTOPLANKTON ; FERRIHYDRITE ; SOLUBILITY ; PROVENANCE |
| 资助项目 | National Natural Science Foundation of China[42325302] ; National Natural Science Foundation of China[42473067] ; Taishan Scholars Program of Shandong Province[tsqn202408275] ; Natural Science Foundation of Shandong Prov-ince[ZR2024QD106] |
| WOS研究方向 | Physical Geography ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001498058500002 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/202169]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Li, Le |
| 作者单位 | 1.Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing 400715, Peoples R China 2.Nanjing Univ, Frontiers Sci Ctr Crit Earth Mat Cycling, Dept Earth & Planetary Sci, Nanjing 210023, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Key Lab Ocean Observat & Forecasting, Qingdao 266071, Peoples R China 4.Qingdao Marine Sci & Technol Ctr, Lab Marine Geol, Qingdao 266237, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ouyang, Shenghui,Zhao, Wancang,Li, Le. Control of surface exposure age on highly reactive iron of atmospheric dust[J]. GLOBAL AND PLANETARY CHANGE,2025,252:8. |
| APA | Ouyang, Shenghui,Zhao, Wancang,&Li, Le.(2025).Control of surface exposure age on highly reactive iron of atmospheric dust.GLOBAL AND PLANETARY CHANGE,252,8. |
| MLA | Ouyang, Shenghui,et al."Control of surface exposure age on highly reactive iron of atmospheric dust".GLOBAL AND PLANETARY CHANGE 252(2025):8. |
入库方式： OAI收割
来源：海洋研究所
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