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首页> 外文期刊>Marine Chemistry >Relationships among aerosol water soluble organic matter, iron and aluminum in European, North African, and Marine air masses from the 2010 US GEOTRACES cruise
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Relationships among aerosol water soluble organic matter, iron and aluminum in European, North African, and Marine air masses from the 2010 US GEOTRACES cruise

机译：2010年美国GEOTRACES巡洋舰中欧洲，北非和海洋气团中的气溶胶水溶性有机物，铁和铝之间的关系

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摘要

The atmospheric delivery of soluble and bioavailable iron (Fe) is essential for the biogeochemical functioning of many oceanic ecosystems where Fe is a limiting micronutrient for biological production. Aerosol samples associated with air masses characterized as European-influenced, primarily marine (no continental influence within 5 day back trajectories), or North African-influenced were collected along a cruise track in the eastern North Atlantic Ocean during a 2010 US GEOTRACES cruise. Aerosols were analyzed for total and soluble Fe and aluminum (Al) and organic matter (OM) loadings and OM chemical characteristics, to explore potential relationships between aerosol OM and Fe and Al that contribute to higher Fe and Al solubilities in combustion-influenced aerosols. Similar to the results from previous studies, North African-influenced air masses contained higher aerosol Fe (4.7-86 nmol m~(-3)) and Al (13-240 nmol m~(-3)) total loadings than European-influenced air masses (Fe: 0.63-2.7 nmol m~(-3); Al: 2.5-5.9 nmol m~(-3)), but Fe and Al relative solubilities were much higher for European (Fe: 2.1-4.6%; Al: 1.9-3.2%) versus North African-influenced aerosols (Fe: 0.22-0.70%; Al: 0.39-1.1%). Water soluble organic carbon (WSOC) to trace metal ratios correlated positively with this trend in Fe and Al relative solubilities, as European-influenced WSOC/trace metal ratios ranged from -2 to 32 while North African-influenced aerosol WSOC/trace metal ratios ranged from 0.04 to 0.51. Aerosols from primarily marine air masses showed the lowest Fe, Al, and OM loadings of all samples and Fe (0.71-2.5%) and Al (0.36-9.2%) solubilities that were variable and did not fit the patterns described for the continentally-influenced samples. Principal component analysis was employed on aerosol water soluble OM (WSOM) solution state ~1H nuclear magnetic resonance spectra and revealed the European-influenced aerosol WSOM to be characterized by higher contributions from acetic acid (a common photoproduct of atmospheric OM) and aliphatic hydrogens, while North African-influenced aerosol WSOM was characterized by carbohydrate-like compounds and compounds with unsaturations. The abundance of the acetic acid photoproduct in European-influenced aerosol WSOM suggests this WSOM to be rich in carboxyl groups that are thought to be strong Fe-binding ligands and provides evidence for the potential role of WSOM in maintaining aerosol Fe and Al solubilities.
机译：大气中可溶性和可生物利用的铁（Fe）的输送对于许多海洋生态系统的生物地球化学功能至关重要，在这些生态系统中，Fe是生物生产的微量营养素。在2010年美国GEOTRACES巡洋舰航行期间，沿着北大西洋东部的一条航迹收集了与空气质量相关的气溶胶样品，这些空气样品的特征是受欧洲影响，主要是海洋（在5天后的轨迹内没有大陆影响）或受北非影响。分析气溶胶的总和可溶性铁和铝（Al）以及有机物（OM）含量和OM化学特性，以探究气溶胶OM与Fe和Al之间的潜在关系，这些关系有助于在受燃烧影响的气溶胶中提高Fe和Al的溶解度。与之前的研究结果相似，受北非影响的气团的总气溶胶Fe（4.7-86 nmol m〜（-3））和Al（13-240 nmol m〜（-3））的总装量高于欧洲影响的气溶胶。空气质量（Fe：0.63-2.7 nmol m〜（-3）; Al：2.5-5.9 nmol m〜（-3）），但欧洲的Fe和Al相对溶解度更高（Fe：2.1-4.6％; Al ：1.9-3.2％）与受北非影响的气溶胶（铁：0.22-0.70％；铝：0.39-1.1％）相比。水溶性有机碳（WSOC）与痕量金属的比率与铁和铝的相对溶解度的趋势呈正相关，因为欧洲影响的WSOC /痕量金属的比率为-2至32，而北非影响的气溶胶WSOC /痕量金属的比率为从0.04到0.51。来自主要海洋气团的气溶胶在所有样品中显示出最低的Fe，Al和OM含量，并且Fe（0.71-2.5％）和Al（0.36-9.2％）的溶解度是可变的，不符合欧洲大陆描述的模式。受影响的样本。对气溶胶水溶性OM（WSOM）溶液状态〜1H核磁共振光谱进行了主成分分析，结果表明，受欧洲影响的气溶胶WSOM的特征是乙酸（大气OM的常见光产物）和脂肪族氢的贡献更大，而受北非影响的气溶胶WSOM的特征是类似碳水化合物的化合物和不饱和化合物。受欧洲影响的气溶胶WSOM中大量的乙酸光产物表明该WSOM富含羧基，这些羧基被认为是牢固的铁结合配体，并为WSOM在维持Fe和Al气溶胶溶解度方面的潜在作用提供了证据。

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