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首页> 外文期刊>Marine Chemistry >Particulate iron delivery to the water column of the Amundsen Sea, Antarctica
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Particulate iron delivery to the water column of the Amundsen Sea, Antarctica

机译：颗粒铁输送到南极洲阿蒙森海的水柱

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The Amundsen Sea, West Antarctica, is home to the most productive polynyas of the Southern Ocean, where summer primary production can reach 3 g C m~(-2) d~(-1). The remoteness of this region has meant that systematic studies of biogeochemistry in the Amundsen Sea polynyas have been limited, despite their importance to overall Antarctic shelf productivity and proximity to the fastest thinning glaciers on the continent. Particulate iron inputs to the productive shelf waters of the Amundsen Sea may be important to the overall bioavailability of Fe in this region of natural Fe fertilization. Here we discuss findings from the US-Swedish 2007-08 expedition aboard the I/B Oden, during which 12 stations were sampled for particulate trace metal analyses at depths of 8-800 m in the eastern and central polynyas as well as in sea ice covered waters, both on the Amundsen continental shelf and in deep waters north of the shelf break. Suspended particulate samples were collected in two size fractions, 0.45-5 μm and > 5 μm. Particulate Fe concentrations ranged from as low as 10 pmol L~(-1) in open Antarctic Circumpo-lar Current (ACC) waters off the continental shelf to > 100,000 pmol L~(-1) near the Crosson Ice Shelf, and were dominated by particles > 5 μm at all stations. The relative concentrations of total particulate Fe, Al, Mn and P show the near-ubiquitous influence of crustal particles in the water column at stations on the Amundsen continental shelf. However, many samples had Fe/Al and Mn/Al ratios substantially in excess of mean crustal ratios, especially in the small size fraction (0.45-5 urn), suggesting that more labile Fe oxyhydroxides and authigenic MnO_2 phases, resulting from sediment resuspension, are also present at relatively high concentrations. In contrast, Fe/P ratios indicate that Fe associated with biogenic particles rarely accounts for more than 20% of total particulate Fe, even in offshore stations. A detailed examination of particulate elemental composition and spatial distribution in the context of water mass temperature and salinity gradients suggests that particle delivery processes associated with melting ice shelves and sediment resuspension dominate the particulate Fe sources to the Amundsen Sea water column.
机译：南极西部的阿蒙森海（Amundsen Sea）是南大洋生产力最高的多年生动物的发源地，夏季的初级产量可达到3 g C m〜（-2）d〜（-1）。尽管该地区对南极大陆架的整体生产力以及与该大陆最快的稀疏冰川的接近度非常重要，但该地区的偏僻意味着对阿蒙森海多年生植物生物地球化学的系统研究受到了限制。在阿蒙森海的生产性陆架水域中投入的颗粒铁可能对于该地区天然铁肥中铁的整体生物利用度很重要。在这里，我们讨论了I / B Oden上美国瑞典2007-08探险队的调查结果，在此期间，对12个站点进行了采样，以对东部和中部波利亚尼亚州以及海冰中8-800 m的深度进行微粒痕量金属分析在Amundsen大陆架和该架断裂以北的深水区中的有盖水域。悬浮颗粒样品以两个尺寸部分（0.45-5μm和> 5μm）收集。铁的浓度范围从大陆架外南极开放圆弧流（ACC）中低至10 pmol L〜（-1）到Crosson冰架附近的> 100,000 pmol L〜（-1）并占主导地位所有站的颗粒物均大于5μm。总颗粒铁，铝，锰和磷的相对浓度表明，在阿蒙森大陆架各站的水柱中，地壳颗粒几乎无处不在。但是，许多样品的Fe / Al和Mn / Al比大大超过了平均地壳比，尤其是在小颗粒部分（0.45-5 urn）中，这表明由于沉积物的重悬浮而产生的不稳定的羟基氧化铁和自生的MnO_2相，也存在相对较高的浓度。相反，Fe / P比率表明，即使在近海站，与生物颗粒相关的Fe很少占总颗粒Fe的20％以上。在水质温度和盐度梯度的背景下，对颗粒元素组成和空间分布的详细检查表明，与融冰架和沉积物再悬浮相关的颗粒输送过程主导着颗粒颗粒铁源到Amundsen海水柱。

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