专家简介：
相阳，美国路易斯安那州立大学助理教授、国际科学计划GEOTRACES青年学者委员会委员。2015年本科毕业于维多利亚老品牌vic3308海洋化学专业，2021年于美国加州大学圣克鲁兹分校获化学海洋学博士学位，同年获加州大学校长毕业奖学金。2021获得美国华盛顿大学CICOES博士后奖学金，于华盛顿大学联合美国国家海洋和大气管理局开展博士后研究。研究基于GEOTRACES大洋航次和长时间序列站，结合化学分析和箱式模型探讨全球尺度海洋颗粒物及痕量金属的生物地球化学循环。参与发表SCI论文十余篇，多篇第一作者/通讯作者文章发表于Global Biogeochemical Cycles、Geophysical Research Letters、Journal of Geophysical Research: Oceans和ACS ES&T Water等国际主流期刊。参与编写地球化学权威综术性论著Treatise on Geochemistry (Third Edition)。担任Nature Communications、Geochimica et Cosmochimica Acta和Global Biogeochemical Cycles等期刊审稿人以及美国国家基金委NSF评审专家。
报告摘要：
Dissolved oxygen (DO) plays a critical role in marine biogeochemical cycles, particularly the biological carbon pump (BCP), which transports surface-produced organic matter into the ocean interior, mediated by different physical and biological mechanisms. The DO can serve as an effective chemical tracer to quantify the strength of the BCP as the total carbon export. However, in situ observations of DO-derived export globally are still lacking, especially on shorter time scales, which hinders our ability to validate satellite-derived export algorithms. Dissolved oxygen also exerts a major control on the cycling of redox-sensitive metals like iron (Fe) and manganese (Mn), with important implications for primary production. The interplay between DO, Fe, and Mn in the ocean is of particular importance within the expanding oxygen minimum zones (OMZs) in the context of a rapidly changing climate. This presentation will explore the use of DO, particulate Fe, and Mn as tracers to elucidate key biogeochemical processes across a range of oxygen concentrations in the global ocean, examining their sources, sinks, and internal cycling. Overall, this work will provide valuable insights into the BCP, lateral transport of dissolved and particulate constituents, and the geochemical consequences of potential future deep-sea mining operations.
