Trace Element Biogeochemistry in the High-Latitude North Atlantic Ocean: Seasonal Variations and Volcanic Inputs
Trace Element Biogeochemistry in the High-Latitude North Atlantic Ocean: Seasonal Variations and Volcanic Inputs
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DOI：
10.1029/2020gb006674
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发表时间：
2021-03-01
影响因子：
5.2
通讯作者：
Moore, C. Mark
中科院分区：
文献类型：
--
作者：
Achterberg, Eric P.;Steigenberger, Sebastian;Moore, C. Mark
我们展示了 2010 年春季和夏季高纬度北大西洋航线的溶解微量元素和总可溶解微量元素。提供了冰岛和伊尔明格盆地的铝、镉、钴、铜、锰、镍、铅和锌的地表和全深度数据，并评估了春季埃亚菲亚德拉冰盖火山喷发的生物吸收和输入的后果。火山喷发期间，埃亚菲亚德拉冰川产生的火山灰导致冰岛附近地表水中的铝、锰和锌含量显着增加，而 3 个月后的夏季巡航期间，铝、锰和锌含量已恢复到该地区更典型的值。表面微量元素表观季节性去除率与生物输出量一致。对该地区地表混合层微量元素供应的评估（不包括火山输入）表明，深冬混合是主要来源，扩散混合是次要来源（深冬通量的 13.5% [溶解的 Cd、DCd] 和 -2.43% [DZn] 之间），大气输入仅是 DA1 和 DZn 的重要来源（DA1 高达 42%，DZn 高达深冬 + 的 4.2%）扩散通量），其他元素通常小于 1%。通过对流对表面混合层的元素供应比率与我们在春季和夏季计算的表观去除比率相当。鉴于深度混合主导了地表水的营养物和微量元素供应，预计该地区水柱分层的增加可能会减少供应，对初级生产和生物碳泵产生潜在影响。
We present dissolved and total dissolvable trace elements for spring and summer cruises in 2010 in the high-latitude North Atlantic. Surface and full depth data are provided for Al, Cd, Co, Cu, Mn, Ni, Pb, and Zn in the Iceland and Irminger Basins, and consequences of biological uptake and inputs by the spring Eyjafjallajokull volcanic eruption are assessed. Ash from Eyjafjallajokull resulted in pronounced increases in Al, Mn, and Zn in surface waters in close proximity to Iceland during the eruption, while 3 months later during the summer cruise levels had returned to more typical values for the region. The apparent seasonal removal ratios of surface trace elements were consistent with biological export. Assessment of supply of trace elements to the surface mixed layer for the region, excluding volcanic inputs, indicated that deep winter mixing was the dominant source, with diffusive mixing being a minor source (between 13.5% [dissolved Cd, DCd] and -2.43% [DZn] of deep winter flux), and atmospheric inputs being an important source only for DA1 and DZn (DA1 up to 42% and DZn up to 4.2% of deep winter + diffusive fluxes) and typically less than 1% for the other elements. Elemental supply ratios to the surface mixed layer through convection were comparable to apparent removal ratios we calculated between spring and summer. Given that deep mixing dominated nutrient and trace element supply to surface waters, predicted increases in water column stratification in this region may reduce supply, with potential consequences for primary production and the biological carbon pump.