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首页> 外文期刊>Marine Chemistry >Particulate iron and other trace elements in near-surface waters of the high latitude North Atlantic following the 2010 Eyjafjallajoekull eruption
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Particulate iron and other trace elements in near-surface waters of the high latitude North Atlantic following the 2010 Eyjafjallajoekull eruption

机译：在2010年Eyjafjallajoekull爆发之后，在高纬度北大西洋的近似地表水域中的颗粒状铁和其他微量元素

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In situ pumps were used to collect size-fractionated particles (53 mu m and 1-53 mu m) from the upper ocean of the high latitude North Atlantic during spring and summer 2010, and samples were subsequently analysed for Al, P, Ti, V, Mn, Fe, Co, Ni, Cu, Zn, Cd, Ba and Pb. Two research cruises during May 2010 coincided with an eruption of the Eyjafjallajokull volcano in southern Iceland, which resulted in widespread dispersal of ash over the region. Ash deposition caused a noticeable perturbation of particulate trace element concentrations and content within marine particles in the Iceland Basin, relative to the Irminger Basin, most evident for lithogenic elements (Al, Ti, Fe), but also noticeable in elemental ratios for the other elements. The initial volcanic ash influence had largely disappeared by the third research cruise in July/August 2010, although there was evidence for a recent wind erosion event having transported remobilized volcanic ash from southern Iceland to the northern Iceland Basin in early July, further perturbing local trace element biogeochemistry. During summer 2010, concentrations of all measured elements except Ba were typically lower 10 m beneath the surface mixed layer relative to those within it, driven primarily by a rapid decrease in the concentrations of large (53 mu m) biogenic particles. Depth-dependent trends were more variable over the next hundred metres for all elements except the biogenic elements P and Cd, for which concentrations decreased further. The continued loss of biogenic material with depth due to remineralization (reflected by particulate P concentrations) led to an increase in content per mass of material for all other elements measured. The observed differences in upper ocean particulate P and Fe distributions highlight the mechanism driving seasonal Fe limitation in the high latitude North Atlantic: rapid loss of P by remineralization regenerates dissolved phosphate close to the base of the mixed layer, while most particulate Fe persists deeper in the water column, removing the potential for resupply of dissolved Fe to surface waters.
机译：在春季和夏季2010年夏季，使用原位泵从高纬度北大西洋的上海收集大小分馏的颗粒（＆ 53 mu m和1-53 mu m），随后对Al，p， Ti，V，Mn，Fe，Co，Ni，Cu，Zn，Cd，Ba和Pb。 2010年5月期间的两项研究巡航恰逢冰岛南部的Eyjafjallajokull火山爆发，导致该地区的灰烬广泛分散。相对于Irminger盆地，冰岛盆地中的海洋颗粒内的颗粒状痕量浓度和含量的显着扰动引起了颗粒状痕量元素浓度和含量的显着扰动，最明显（Al，Ti，Fe），但在其他元素的元素比例中也明显。初期的火山灰影响力在2010年7月/ 8月的第三次研究巡航主要是消失的，尽管有证据表明最近的风蚀事件从7月初到冰岛南部到北部冰岛盆地的重新排列的火山灰，进一步扰乱了本地痕迹元素生物地球化学。在2010年夏季，除了BA之外的所有测量元素的浓度通常在表面混合层下方的10米相对于其中的那些，主要通过大（＆53μm）生物颗粒的浓度快速降低而驱动。除了生物元素P和CD之外的所有元素，依赖于百米的深度依赖性趋势更具变化，浓度进一步降低。由于再矿化（通过颗粒P浓度反射）导致对所有其他材料的含量增加，对所有其他元素的含量增加，对所有其他元素的含量增加。上海颗粒状P和FE分布的观察到差异突出了驾驶季节性Fe限制的机制在高纬度北大西洋：通过再矿化再生溶解磷酸盐近距离混合层的磷酸盐，而大多数颗粒FE持续水柱，除去溶解的Fe的潜力将溶解到表面水域。

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