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Atmospheric Processing of Iron-Bearing Mineral Dust Aerosol and Its Effect on Growth of a Marine Diatom, Cyclotella meneghiniana
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-12-31 , DOI: 10.1021/acs.est.0c06995 Eshani Hettiarachchi 1 , Sergei Ivanov 2 , Thomas Kieft 3 , Harland L. Goldstein 4 , Bruce M. Moskowitz 5 , Richard L. Reynolds 4, 5 , Gayan Rubasinghege 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-12-31 , DOI: 10.1021/acs.est.0c06995 Eshani Hettiarachchi 1 , Sergei Ivanov 2 , Thomas Kieft 3 , Harland L. Goldstein 4 , Bruce M. Moskowitz 5 , Richard L. Reynolds 4, 5 , Gayan Rubasinghege 1
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Iron (Fe) is a growth-limiting micronutrient for phytoplankton in major areas of oceans and deposited wind-blown desert dust is a primary Fe source to these regions. Simulated atmospheric processing of four mineral dust proxies and two natural dust samples followed by subsequent growth studies of the marine planktic diatom Cyclotella meneghiniana in artificial sea-water (ASW) demonstrated higher growth response to ilmenite (FeTiO3) and hematite (α-Fe2O3) mixed with TiO2 than hematite alone. The processed dust treatment enhanced diatom growth owing to dissolved Fe (DFe) content. The fresh dust-treated cultures demonstrated growth enhancements without adding such dissolved Fe. These significant growth enhancements and dissolved Fe measurements indicated that diatoms acquire Fe from solid particles. When diatoms were physically separated from mineral dust particles, the growth responses become smaller. The post-mineralogy analysis of mineral dust proxies added to ASW showed a diatom-induced increased formation of goethite, where the amount of goethite formed correlated with observed enhanced growth. The current work suggests that ocean primary productivity may not only depend on dissolved Fe but also on suspended solid Fe particles and their mineralogy. Further, the diatom C. meneghiniana benefits more from mineral dust particles in direct contact with cells than from physically impeded particles, suggesting the possibility for alternate Fe-acquisition mechanism/s.
中文翻译：
含铁矿物质粉尘气溶胶的大气处理及其对海洋硅藻，Cyclotella meneghiniana的生长的影响
铁（Fe）是海洋主要地区浮游植物生长受限的微量元素，沉积的风吹沙漠尘是这些地区主要的铁源。四个矿尘代理和两个自然尘埃样本模拟大气处理随后浮游硅藻海洋的后续生长的研究小环meneghiniana在人造海水（ASW）表现出较高的生长响应于钛铁矿（FeTiO 3）和赤铁矿（α-的Fe 2 O 3）与TiO 2混合比赤铁矿单独。经过处理的粉尘处理由于溶解的Fe（DFe）含量而促进了硅藻的生长。新鲜的经粉尘处理的培养物在不添加此类溶解铁的情况下显示出生长的增强。这些显着的生长促进作用和溶解的铁含量表明硅藻从固体颗粒中获取铁。当硅藻与矿物尘埃颗粒物理分离时，生长响应变小。矿物学后对添加到ASW中的矿物粉尘代理的分析表明，硅藻土诱导的针铁矿形成增加，其中针铁矿形成的数量与观察到的生长增强相关。当前的工作表明，海洋的初级生产力可能不仅取决于溶解的铁，还取决于悬浮的固体铁颗粒及其矿物学。此外，硅藻C. meneghiniana 直接与细胞接触的矿物尘埃颗粒比受物理阻碍的颗粒具有更多的益处，这提示了替代性的铁捕获机制的可能性。
更新日期：2021-01-19
中文翻译：
含铁矿物质粉尘气溶胶的大气处理及其对海洋硅藻，Cyclotella meneghiniana的生长的影响
铁（Fe）是海洋主要地区浮游植物生长受限的微量元素，沉积的风吹沙漠尘是这些地区主要的铁源。四个矿尘代理和两个自然尘埃样本模拟大气处理随后浮游硅藻海洋的后续生长的研究小环meneghiniana在人造海水（ASW）表现出较高的生长响应于钛铁矿（FeTiO 3）和赤铁矿（α-的Fe 2 O 3）与TiO 2混合比赤铁矿单独。经过处理的粉尘处理由于溶解的Fe（DFe）含量而促进了硅藻的生长。新鲜的经粉尘处理的培养物在不添加此类溶解铁的情况下显示出生长的增强。这些显着的生长促进作用和溶解的铁含量表明硅藻从固体颗粒中获取铁。当硅藻与矿物尘埃颗粒物理分离时，生长响应变小。矿物学后对添加到ASW中的矿物粉尘代理的分析表明，硅藻土诱导的针铁矿形成增加，其中针铁矿形成的数量与观察到的生长增强相关。当前的工作表明，海洋的初级生产力可能不仅取决于溶解的铁，还取决于悬浮的固体铁颗粒及其矿物学。此外，硅藻C. meneghiniana 直接与细胞接触的矿物尘埃颗粒比受物理阻碍的颗粒具有更多的益处，这提示了替代性的铁捕获机制的可能性。
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