Non‐synchronous deposition of North Atlantic Ash Zone II in Greenland ice cores, and North Atlantic and Norwegian Sea sediments: an example of complex glacial‐stage tephra transport
Non‐synchronous deposition of North Atlantic Ash Zone II in Greenland ice cores, and North Atlantic and Norwegian Sea sediments: an example of complex glacial‐stage tephra transport
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格陵兰冰芯以及北大西洋和挪威海沉积物中北大西洋灰烬带 II 的非同步沉积：复杂冰期火山灰迁移的一个例子
DOI：
10.1002/jqs.1499
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发表时间：
2011
影响因子：
2.3
通讯作者：
H. Sejrup
中科院分区：
文献类型：
--
作者：
J. Brendryen;H. Haflidason;H. Sejrup
Tephra提供了区域性年代地层标志层，可以以高度需要的准确性和精度将不同的气候档案联系起来。然而，这项工作的结果表明，间歇性存储的火山灰在冰盖和随后的冰山运输，特别是在冰川阶段，构成了一个潜在的来源，严重的错误应用于北欧海洋和北大西洋沉积物档案的火山灰年代学。北大西洋火山灰带II（NAAZ‐II）火山灰复合体的流纹岩组分的峰值碎片浓度，通常用于在海洋同位素阶段（MIS）3中将海洋和冰芯记录相关联，被证明滞后于喷发事件约。100-400年在一些北大西洋和挪威海的核心。虽然仍然允许千年时间尺度上的档案相互关联，但在处理短时间尺度（几年至几个世纪）的超前-滞后关系时，沉积的这种时间延迟是一个主要障碍。精确和准确地确定记录气候系统不同部分的档案之间的超前-滞后关系对于检验关于导致气候突变的过程的假设和评价气候模型的结果至关重要。版权所有© 2011约翰威利父子有限公司.
Tephra provides regional chronostratigraphical marker horizons that can link different climate archives with highly needed accuracy and precision. The results presented in this work exemplify, however, that the intermittent storage of tephra in ice sheets and during its subsequent iceberg transport, especially during glacial stages, constitutes a potential source of serious error for the application of tephrochronology to Nordic Seas and North Atlantic sediment archives. The peak shard concentration of the rhyolitic component of the North Atlantic Ash Zone II (NAAZ‐II) tephra complex, often used to correlate marine and ice core records in Marine Isotope Stage (MIS) 3, is shown to lag the eruption event by ca. 100–400 years in some North Atlantic and Norwegian Sea cores. While still allowing for a correlation of archives on millennial timescales, this time delay in deposition is a major obstacle when addressing the lead–lag relationship on short timescales (years to centuries). A precise and accurate determination of lead–lag relationships between archives recording different parts of the climate system is crucial in order to test hypotheses about the processes leading to abrupt climate change and to evaluate results from climate models. Copyright © 2011 John Wiley & Sons, Ltd.