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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >The effects of continental margins and water mass circulation on the distribution of dissolved aluminum and manganese in Drake Passage
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The effects of continental margins and water mass circulation on the distribution of dissolved aluminum and manganese in Drake Passage

机译：大陆边缘和水质循环对德雷克海峡中溶解铝和锰分布的影响

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摘要

A total of 232 samples were analyzed for concentrations of dissolved aluminum ([A1]) and manganese ([Mn]) in Drake Passage.Both [Al] and [Mn] were extremely low (～0.3 and 0.1 nM, respectively) in the surface layer of the middle Drake Passage,most likely due to limited input and biological uptake/scavenging.Elevated [Al] (>14 nM) and [Mn] (>2 nM) over the South American continental shelf are related to land run-off, whereas elevated concentrations (>1 nM and >2 nM,respectively) near the Antarctic Peninsula are most likely related to sediment re-suspension. Re-suspension of sedimentary particles and pore waters influences the distribution of [Al] and [Mn] over the continental slopes on both sides of Drake Passage.The influence of the continental margins and accumulated dust input potentially explains the higher [Al] observed eastward in the Atlantic section of the Southern Ocean.In the northern Drake Passage,elevated [Al] (～0.8 nM) and [Mn] (～0.3 nM) near the seafloor are most likely the result of bottom sediment re-suspension by the relatively strong currents.In the deep southern Drake Passage sediment re-suspension associated with the inflow of Weddell Sea Deep Water appears to cause elevated [Al] (>1 nM) and [Mn] (～0.4 nM).In the deep northern Drake Passage,North Atlantic Deep Water brings in elevated [Al] and Southeast Pacific Deep Slope Water brings in the signature of Pacific hydrothermal vents.Elevated [Mn] and δ~3 He were correlated in this water layer and are most likely originating from the volcanically active ridges in the Pacific Ocean.
机译：分析了总共232个样品的德雷克通道中的溶解铝（[A1]）和锰（[Mn]）的浓度。在样品中[Al]和[Mn]都非常低（分别约为0.3和0.1 nM）。中部Drake通道的表层，最有可能是由于有限的输入和生物吸收/清除作用。南美大陆架上的[Al]（> 14 nM）和[Mn]（> 2 nM）升高与土地流失有关。关闭，而南极半岛附近浓度升高（分别> 1 nM和> 2 nM）最有可能与沉积物的重新悬浮有关。沉积颗粒和孔隙水的再悬浮影响了德雷克海峡两岸大陆坡上[Al]和[Mn]的分布。大陆边缘和积尘输入的影响可能解释了向东观测到的[Al]越高在南大洋通道中。在北德雷克海峡，海床附近的[Al]（〜0.8 nM）和[Mn]（〜0.3 nM）升高是底部沉积物重新悬浮的结果。在南部德雷克海峡深处，与韦德海流入有关的沉积物重新悬浮似乎导致[Al]（> 1 nM）和[Mn]（〜0.4 nM）升高。在北部德雷克海峡深处，北大西洋深水带入高位[Al]，东南太平洋深坡水带入太平洋热液喷口。高位[Mn]和δ〜3 He与该水层相关，最有可能源自火山活动帕西的山脊菲克海洋。

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