Bown Johann, van Haren Hans, Meredith Michael P, Venables Hugh J, Laan Patrick, Brearley J Alexander, de Baar Hein J W
NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands
NIOZ, Royal Netherlands Institute for Sea Research and Utrecht University, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands.
Philos Trans A Math Phys Eng Sci. 2018 Jun 28;376(2122). doi: 10.1098/rsta.2017.0172.
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'.
在南半球夏季（2013年和2014年），对南极半岛西部一个小型沿海海湾——莱德湾中溶解态铁（DFe）和溶解态锰（DMn）的空间分布、生物地球化学循环及外源进行了调查。在莱德湾内的11个站位对整个水柱中的溶解态浓度进行了测量。DFe和DMn的浓度范围很大，分别在0.58至32.7纳摩尔之间和0.18至26.2纳摩尔之间，从表层到底层呈现出强烈的梯度变化。DFe和DMn的表层浓度高于南大洋和南极沿海水域的报道浓度，且在深层水中检测到极高浓度。冰川融水和浅海沉积物可能是真光层中DFe和DMn的主要来源，而与局部沉积物再悬浮和垂直混合相关的侧向平流是中层水和深层水的重要来源。在夏季，从中层水和深层水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，被认为会因一系列海槛溢流而增强，从而增加来自底部沉积物的铁和锰的输入，并将它们的浓度提升至真光层。本文是主题为“南极半岛西部的海洋系统：快速变化区域的现状与发展战略”这一特刊的一部分。
