Quantification of ikaite in Antarctic sea ice
Quantification of ikaite in Antarctic sea ice
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DOI：
10.1017/s0954102012001150
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发表时间：
2012-02
影响因子：
1.6
通讯作者：
M. Fischer;D. Thomas;A. Krell;G. Nehrke;J. Göttlicher;L. Norman;K. Meiners;C. Riaux-Gobin;G. Dieckmann
中科院分区：
文献类型：
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作者：
M. Fischer;D. Thomas;A. Krell;G. Nehrke;J. Göttlicher;L. Norman;K. Meiners;C. Riaux-Gobin;G. Dieckmann
摘要 海冰中的碳酸钙沉淀被认为可能推动海洋大量吸收二氧化碳。然而，人们对海冰内 CaCO3 的定量空间和时间分布知之甚少，尽管推测大量溶解的有机物和/或磷酸盐（海冰中常见）可能会抑制其形成。在这项水合碳酸钙作为伊卡石的定量研究中，海冰芯和盐水样本是在 2007 年 9 月至 12 月两次探险期间从堆积和陆地的固定海冰中收集的，一次在南极东部地区，另一次在阿德利岛附近。分析样品的 CaCO3、盐度、溶解有机碳/氮、无机磷酸盐和总碱度。这些参数与 CaCO3 沉淀之间没有明显的关系。伊凯特石主要存在于海冰的最上层，测量的最大浓度高达每升融化海冰 126 毫克伊凯特石，尽管伊凯特石的时间和水平空间分布都高度不均匀。在一些采样点的海冰顶部的雪中也发现了沉淀物。
Abstract Calcium carbonate precipitation in sea ice is thought to potentially drive significant CO2 uptake by the ocean. However, little is known about the quantitative spatial and temporal distribution of CaCO3 within sea ice, although it is hypothesized that high quantities of dissolved organic matter and/or phosphate (common in sea ice) may inhibit its formation. In this quantitative study of hydrous calcium carbonate as ikaite, sea ice cores and brine samples were collected from pack and land fast sea ice between September and December 2007 during two expeditions, one in the East Antarctic sector and the other off Terre Adélie. Samples were analysed for CaCO3, salinity, dissolved organic carbon/nitrogen, inorganic phosphate, and total alkalinity. No relationship between these parameters and CaCO3 precipitation was evident. Ikaite was found mostly in the uppermost layers of sea ice with maximum concentrations of up to 126 mg ikaite per litre melted sea ice being measured, although both the temporal and horizontal spatial distributions of ikaite were highly heterogeneous. The precipitate was also found in the snow on top of the sea ice at some of the sampling locations.