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首页> 外文期刊>Paleoceanography >Surface water conditions and calcium carbonate preservation in the Fram Strait during marine isotope stage 2, 28.8-15.4 kyr
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Surface water conditions and calcium carbonate preservation in the Fram Strait during marine isotope stage 2, 28.8-15.4 kyr

机译：海洋同位素第2阶段28.8-15.4千瓦时弗拉姆海峡的地表水条件和碳酸钙保存

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摘要

We present a high-resolution record of calcium carbonate preservation alongside the distribution pattern of planktic foraminifera from the Fram Strait. The record covers the marine isotope stage (MIS) 2, 28.8 to 15.4 kyr, including the Last Glacial Maximum (LGM) and the early deglaciation in multidecadal temporal resolution. The investigation is based on the distribution patterns of planktic foraminifera, stable isotopes, mean shell weight of Neogloboquadrina pachyderma, the degree of fragmentation of planktic shells, CaCO_3 content, and geochemical and sedimentological data. The dissolution proxies indicate long-lasting periods of markedly reduced preservation of calcium carbonate at ~28.8-27.2, ~24.1-23.2, and~16.6-15.4 kyr in addition to a number of short-lasting periods (< 300 year) during the LGM. These periods are accompanied by a simultaneous and significant reduction in specimens of subpolar planktic foraminifera indicating a southward expansion of Arctic surface water masses. Prolonged periods with high abundances of subpolar foraminiferal species and good preservation of calciumcarbonate are attributed to increased influence of Atlantic watermasses, which appears to persist throughout most of theMIS 2. Comparison to Holocene (MIS 1) shell weight records shows that the preservation during MIS 2 was overall better, even during the events of dissolution. This was probably a reflection of the low concentration of atmospheric CO_2 at the time.
机译：我们呈现了碳酸钙保存的高分辨率记录以及弗拉姆海峡浮游有孔虫的分布模式。记录涵盖了海洋同位素阶段2（MIS）2，28.8至15.4 kyr，包括最后冰川期（LGM）和多年代际时间分辨率上的早期冰消。该调查基于浮游有孔虫的分布模式，稳定的同位素，新球藻的平均壳重，浮游壳的碎裂程度，CaCO_3含量以及地球化学和沉积学数据。溶解代理表明，在LGM期间，碳酸钙的长期保存期显着减少，约为〜28.8-27.2，〜24.1-23.2和〜16.6-15.4，而且还存在许多短暂的时期（<300年） 。这些时期伴随着亚极板状有孔虫标本的同时大量​​减少，表明北极地表水团向南扩展。亚极有孔虫物种的丰度较高且碳酸钙的良好保存时间延长，是由于大西洋水质的影响增加，在整个MIS 2的大部分时间里这种情况似乎持续存在。与全新世（MIS 1）壳重记录的比较表明，MIS 2期间的保存即使在解散事件中总体上还是更好。这可能是当时大气中CO_2浓度低的反映。

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