Last interglacial (MIS 5e) surface water conditions at the Vøring Plateau (Norwegian Sea), based on dinoflagellate cysts
Last interglacial (MIS 5e) surface water conditions at the Vøring Plateau (Norwegian Sea), based on dinoflagellate cysts
复制标题
基于甲藻包囊的沃尔令高原（挪威海）末次间冰期 (MIS 5e) 地表水状况
DOI：
10.1111/j.1751-8369.2008.00062.x
复制
发表时间：
2008
期刊：
影响因子：
1.9
通讯作者：
H. Bauch
中科院分区：
文献类型：
--
作者：
Nicolas Van Nieuwenhove;H. Bauch
本文研究了末次间冰期沉积物中甲藻孢囊的含量，该沉积物来自于挪威海Vøring高原的一个岩芯。定性和定量分析的数据，并与表面样品和公布的全新世数据的核心比较，揭示了全新世晚期和MIS 5e之间的水文表面条件的显着差异。在最后一次间冰期的样本中，有更多的共同优势的从属物种表明，此时地表水的季节性更明显。这是由Bitectatodinium tepikiense的显着存在的支持，这是一个物种，几乎没有从该地区的大部分全新世。季节性信号进一步证实了传递函数重建，这也表明了一个更强的分层的上层水柱在MIS 5e。此外，组合数据清楚地表明，最佳的，完全海洋间冰期的条件只占上风晚MIS 5e（约之间。117.5和116.5 Kya），这与全新世早期的气候最佳时期形成对比。稳定的氧同位素值从南极有孔虫的MIS 5e最佳值是可比的平均全新世值，但一般约。比末次间冰期早期高0.3‰。这些较高的d18O值很可能是增强和长期影响的Saalian冰消期融水的结果，从而证实了一个完全不同的结构的海面的存在，所建议的dinocyst数据。
Sediments from the last interglacial, marine isotope stage 5e (MIS 5e), have been studied for their dinoflagellate cyst content in a core retrieved from the Vøring Plateau, Norwegian Sea. Qualitative and quantitative analyses of the data, and comparison with the surface sample and published Holocene data from the core, reveal distinct differences in hydrological surface conditions between the late Holocene and MIS 5e. A higher number of co-dominant, subordinate species in the last interglacial samples suggests there was a more pronounced seasonality of the surface water at this time. This is supported by the significant presence of Bitectatodinium tepikiense, a species that was virtually absent from the area for most of the Holocene. The seasonality signal is further substantiated by transfer-function reconstructions, which also indicates a stronger stratification of the upper water column during MIS 5e. Moreover, the assemblage data clearly show that optimal, fully marine interglacial conditions prevailed only late in MIS 5e (between ca. 117.5 and 116.5 Kya), which is in contrast with the climatic optimum early in the Holocene. Stable oxygen isotope values from planktic foraminifera for this MIS 5e optimum are comparable with the average Holocene values, but are generally ca. 0.3‰ higher than those of the earlier part of the last interglacial (sensu stricto). These higher d18O values are likely to be the result of the enhanced and prolonged influence of Saalian deglacial meltwater, thus corroborating the existence of a quite differently structured sea surface, as suggested by the dinocyst data.