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首页> 外文期刊>Geophysical Research Letters >Size distributions of organic nitrogen and carbon in remote marine aerosols: Evidence of marine biological origin based on their isotopic ratios
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Size distributions of organic nitrogen and carbon in remote marine aerosols: Evidence of marine biological origin based on their isotopic ratios

机译：偏远海洋气溶胶中有机氮和碳的尺寸分布：基于同位素比值的海洋生物起源证据

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摘要

Size-segregated aerosol samples were collected over the western North Pacific in summer 2008 for the measurements of organic nitrogen (ON) and organic carbon (OC). ON and OC showed bimodal size distributions. Their concentrations showed positive correlation with those of biogenic tracers, methanesulfonic acid (MSA) and azelaic acid (C_9). We found that average ON and OC concentrations were twice greater in aerosols collected in the oceanic region with higher biological productivity than in the regions with lower productivity. The average ON/ OC ratios are higher (0.49 ± 0.11) in more biologically influenced aerosols than those (0.35 ± 0.10) in less influenced aerosols. Stable carbon isotopic analysis indicates that marine-derived carbon accounted for ～72% of total carbon in more biologically influenced aerosols. These results provide evidence that organic aerosols in this region are enriched in ON that is linked to oceanic biological activity and the subsequent emissions to the atmosphere.
机译：在2008年夏季，在北太平洋西部收集了按大小分类的气溶胶样品，用于测量有机氮（ON）和有机碳（OC）。 ON和OC显示出双峰大小分布。它们的浓度与生物示踪剂，甲磺酸（MSA）和壬二酸（C_9）的浓度呈正相关。我们发现，在具有较高生物生产力的海洋区域收集的气溶胶中，平均ON和OC浓度要比生产力较低的区域的平均ON和OC浓度高两倍。受生物影响较大的气溶胶的平均ON / OC比较高（0.49±0.11），而受生物影响较小的气溶胶的平均ON / OC比较高（0.35±0.10）。稳定的碳同位素分析表明，在受到更多生物影响的气溶胶中，海洋来源的碳约占总碳的72％。这些结果提供了证据，表明该地区的有机气溶胶富含ON，这与海洋生物活动及随后的大气排放有关。

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