Mineral Aerosols as a Source of Marine Dissolved Silica: A Ge/Si Mass Balance Approach

摘要：本文将采用Ge/Si质量平衡法结合实验室溶解实验，研究粉尘对海洋硅循环的影响。实验室工作将是对气溶胶与雨水和海水反应过程中Si和Ge溶解的实验研究，通过该实验可以评估颗粒到达海洋表面后气溶胶成分的变化。此外，通过对海洋沉积物、沉积物捕集器样品和海水的风成组分的研究，PI将构建气溶胶和沉积物之间的Ge-Si质量平衡，以约束从尘埃到海洋的Si通量。由于冰期和间冰期之间的风况和相关的海洋沙尘输入可能非常不同，因此该研究可能对理解与冰期/间冰期旋回相关的生物地球化学变化具有重要意义。

ABSTRACTOCE-9977103This work will study the impact of dust on the marine Si cycle using a Ge/Si mass balance approach coupled with laboratory dissolution experiments. The laboratory work will be an experimental study of Si and Ge dissolution from aerosols during reaction with rainwater and seawater, by which changes in aerosol composition after the particles reach the surface ocean can be assessed. Additionally, through studies on the eolian component of pelagic sediments, sediment trap samples, and seawater, the PI would construct a Ge-Si mass balance between aerosols and sediments to constrain the Si flux from dust to the oceans. Because the wind regime and associated dust input into the ocean between glacial and interglacial periods is likely very different, this study could have important implication to understanding biogeochemical changes associated with glacial/interglacial cycles.