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Effects of soot deposition on particle dynamics and microbial processes in marine surface waters

机译：烟尘沉积对海洋表层水中颗粒动力学和微生物过程的影响

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摘要

Large amounts of soot are continuously deposited on the global ocean. Even though significant concentrations of soot particles are found in marine waters, the effects of these aerosols on ocean ecosystems are currently unknown. Using a combination of in situ and experimental data, and results from an atmospheric transport model, we show that the deposition of soot particles from an oil-fired power plant impacted biogeochemical properties and the functioning of the pelagic ecosystem in tropical oligotrophic oceanic waters off New Caledonia. Deposition was followed by a major increase in the volume concentration of suspended particles, a change in the particle size spectra that resulted from a stimulation of aggregation processes, a 5% decrease in the concentration of dissolved organic carbon (DOC), a decreases of 33 and 23% in viral and free bacterial abundances, respectively, and a factor ~2 increase in the activity of particle-attached bacteria suggesting that soot introduced in the system favored bacterial growth. These patterns were confirmed by experiments with natural seawater conducted with both soot aerosols collected in the study area and standard diesel soot. The data suggest a strong impact of soot deposition on ocean surface particles, DOC, and microbial processes, at least near emission hot spots.
机译：大量的烟灰不断地沉积在全球海洋上。尽管在海水中发现了高浓度的烟尘颗粒，但目前尚不清楚这些气溶胶对海洋生态系统的影响。使用原位和实验数据的组合以及大气传输模型的结果，我们表明，来自石油发电厂的烟尘颗粒沉积影响了新近热带贫营养海洋水域的生物地球化学性质和中上层生态系统的功能。喀里多尼亚。沉积后，悬浮颗粒的体积浓度显着增加，这是由于聚集过程的刺激而引起的粒径谱变化，溶解有机碳（DOC）浓度降低了5％，降低了33％病毒和游离细菌的丰度分别为30％和23％，并且颗粒附着细菌的活性增加了约2倍，这表明引入系统的烟so有利于细菌生长。通过在研究区域收集的烟灰气溶胶和标准柴油烟灰进行的天然海水实验证实了这些模式。数据表明烟灰沉积对海洋表面颗粒，DOC和微生物过程（至少在排放热点附近）有很大影响。

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