Evidences of strong sources of DFe and DMn in Ryder Bay, Western Antarctic Peninsula.
Evidences of strong sources of DFe and DMn in Ryder Bay, Western Antarctic Peninsula.
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南极半岛西部莱德湾存在强大 DFe 和 DMn 来源的证据。
DOI：
10.1098/rsta.2017.0172
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Bown J
中科院分区：
文献类型：
--
作者：
Bown J
2013年和2014年夏季，对南极西部半岛沿岸小海湾莱德湾（Ryder Bay）溶解态铁和溶解态锰（DFe和DMn）的空间分布、地球化学循环和外源特征进行了研究。在莱德湾内的11个站的整个水柱溶解浓度进行了测量。DFe和DMn的浓度范围很大，分别在0.58和32.7 nM之间，以及在0.18和26.2 nM之间，表现出从表面到底部的强梯度。DFe和DMn的表面浓度高于南大洋和南极沿海沃茨报告的浓度，在深水中检测到极高的浓度。冰川融水和浅层沉积物可能是真光层DFe和DMn的主要来源，而与当地沉积物再悬浮和垂直混合相关的横向平流是中层和深层沃茨的重要来源。在夏季，中层和深层沃茨的垂直混合以及从玛格丽特海槽到莱德湾发生的沉积物再悬浮被一系列底床溢流放大，增加了来自底部沉积物的铁和锰的输入，并增加了它们在真光层的浓度。本文是主题"西南极半岛的海洋系统：在迅速变化区域取得进展的现状和战略。
The spatial distribution, biogeochemical cycling and external sources of dissolved iron and dissolved manganese (DFe and DMn) were investigated in Ryder Bay, a small coastal embayment of the West Antarctic Peninsula, during Austral summer (2013 and 2014). Dissolved concentrations were measured throughout the water column at 11 stations within Ryder Bay. The concentration ranges of DFe and DMn were large, between 0.58 and 32.7 nM, and between 0.18 and 26.2 nM, respectively, exhibiting strong gradients from the surface to the bottom. Surface concentrations of DFe and DMn were higher than concentrations reported for the Southern Ocean and coastal Antarctic waters, and extremely high concentrations were detected in deep water. Glacial meltwater and shallow sediments are likely to be the main sources of DFe and DMn in the euphotic zone, while lateral advection associated with local sediment resuspension and vertical mixing are significant sources for intermediate and deep waters. During summer, vertical mixing of intermediate and deep waters and sediment resuspension occurring from Marguerite Trough to Ryder Bay are thought to be amplified by a series of overflows at the sills, enhancing the input of Fe and Mn from bottom sediment and increasing their concentrations up to the euphotic layer.This article is part of the theme issue ‘The marine system of the West Antarctic Peninsula: status and strategy for progress in a region of rapid change’.