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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Modern dirty sea ice characteristics and sources: The role of anchor ice
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Modern dirty sea ice characteristics and sources: The role of anchor ice

机译：现代脏海冰的特征和来源：锚冰的作用

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Extensive dirty ice patches with up to 7 kg m~(-2) sediment concentrations in layers of up to 10 cm thickness were encountered in 2005 and 2007 in numerous areas across the central Arctic. The Fe grain fingerprint determination of sources for these sampled dirty ice floes indicated both Russian and Canadian sources, with the latter dominating. The presence of benthic shells and sea weeds along with thick layers (2–10 cm) of sediment covering 5–10 m~2 indicates an anchor ice entrainment origin as opposed to suspension freezing for some of these floes. The anchor ice origin might explain the dominance of Canadian sources where only narrow flaw leads occur that would not favor suspension freezing as an entrainment process. Expandable clays, commonly used as an indicator of a Kara Sea origin for dirty sea ice, are present in moderately high percentages (＞20%) in many circum‐Arctic source areas, including the Arctic coasts of North America. Some differences between the Russian and the North American coastal areas are found in clay mineral abundance, primarily the much higher abundance of chlorite in North America and the northern Barents Sea as opposed to the rest of the Russian Arctic. However, sea ice clay mineralogy matched many source areas, making it difficult to use as a provenance tool by itself. The bulk mineralogy (clay and non‐clay) does not match specific sources possibly due to reworking of the sediment in dirty floes through summer melting or the failure to characterize all possible source areas.
机译：2005年和2007年，在北极中部的许多地区都遇到了厚厚不洁的冰块，其沉积物浓度高达7 kg m〜（-2），层厚达10 cm。这些采样的肮脏浮冰的铁晶粒指纹图谱来源的确定表明俄罗斯和加拿大的来源均以后者为主。底栖壳和海草的存在以及覆盖5-10 m〜2的厚沉积物（2-10 cm）的沉积物表明锚定夹带冰的起源，而不是其中一些絮凝体的悬浮冻结。锚冰的起源可能解释了加拿大水源的优势，那里只有狭窄的裂缝出现，而这不利于悬浮过程的夹带。可膨胀的粘土通常被用来指示卡拉海起源于肮脏的海冰，在许多北北极地区，包括北美的北极海岸，都以中等较高的比例（＞ 20％）存在。俄罗斯和北美沿海地区之间的粘土矿物丰度存在一些差异，主要是北美和巴伦支海北部的亚氯酸盐丰度远高于俄罗斯北极其他地区。但是，海冰粘土矿物学与许多来源地区相匹配，因此很难单独用作物产工具。大量的矿物学（粘土和非粘土）与特定的来源不匹配，这可能是由于夏季融化过程中肮脏的絮凝物中的沉积物再加工或无法表征所有可能的来源区域所致。

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