Distribution and biogeochemical behaviour of iron in the East Antarctic sea ice
Distribution and biogeochemical behaviour of iron in the East Antarctic sea ice
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DOI：
10.1016/j.marchem.2006.06.010
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发表时间：
2007-07-01
期刊：
影响因子：
3
通讯作者：
Chou, Lei
中科院分区：
文献类型：
--
作者：
Lannuzel, Delphine;Schoemann, Veronique;Chou, Lei
我们试图评估的相对重要性，与其他可能的来源相比，海冰在供应铁东南极表层海洋沃茨。在2003年9月至10月的“东方的ARISE”南极巡航期间（南纬64度至65度/东经112度至119度，南极光号RV），收集并处理了雪、盐水、海水和海冰样品，用于铁分析。测定了总溶解铁和溶解铁的含量以及相关的物理、化学和生物学参数。我们观察到的最显著的特征是，海冰中的总溶解铁浓度比底层海水中测得的浓度高出一个数量级。此外，海冰中的总溶解铁更集中在寒冷的“冬季”型站比温暖的“春季”。这可能是由于春天到来时冰的渗透性增强，这使得冰盖内的盐水排水成为可能，并使与水柱的交换成为可能。在融化期间，从海冰输入到表面沃茨的铁可能代表多达70%的估计每日总通量进入表面海水时，考虑到现有的数据尘埃沉积，外星铁，垂直扩散和上升流。我们的研究结果强调了浮冰对东南极海洋生态系统中Fe地球化学循环的潜在重要贡献。(C)2006 Elsevier B. V.保留所有权利。
We have attempted to evaluate the relative importance, compared to other possible sources, of sea ice in supplying Fe to East Antarctic surface ocean waters. Samples of snow, brine, seawater and sea ice were collected and processed for Fe analysis during the "ARISE in the East" Antarctic cruise during September-October 2003 (64 degrees-65 degrees S/112 degrees-119 degrees E, RV Aurora Australis). Total-dissolvable and dissolved Fe concentrations were measured together with relevant physical, chemical and biological parameters. The most striking feature we observed is that total-dissolvable Fe concentrations in sea ice were up to an order of magnitude higher than those measured in the underlying seawater. Moreover, total-dissolvable Fe in sea ice is more concentrated at cold "winter" type stations than at the warm "spring" ones. This probably results from the enhanced ice permeability as spring arrives, which allows brine drainage within the ice cover and renders exchanges with the water column possible. During the melting period, iron inputs to surface waters from sea ice may represent as much as 70% of the estimated daily total flux into surface seawater when taking into account available data on dust deposition, extraterrestrial iron, vertical diffusion and upwelling. Our results highlight the potentially important contribution of pack ice to the Fe biogeochemical cycle in the East Antarctic oceanic Ecosystem. (C) 2006 Elsevier B.V. All rights reserved.