Paleoceanographic implications of the difference in deep-sea sediment mixing between large and fine particles
Paleoceanographic implications of the difference in deep-sea sediment mixing between large and fine particles
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DOI：
10.1029/2000pa000537
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发表时间：
2001-06-01
期刊：
影响因子：
--
通讯作者：
Bard, E
中科院分区：
文献类型：
--
作者：
Bard, E
越来越多的古海洋学研究是在深海沉积物的不同粒级上进行的。虽然这一直是一个有争议的问题，一段时间以来，生物扰动过程取决于颗粒的大小，原则上，可以解耦的古海洋学记录在同一个核心。这个问题的研究，通过使用一个简单的混合模型，它允许推导的分析方程的预期相移和相对衰减的信号进行不同尺寸的馏分。取决于若干参数，时移和相对衰减可以分别为几千年和50%的量级。然而，高沉积速率（> 10-20 cm/kyr）最大限度地减少了这些潜在的并发症，使我们能够在精心选择的沉积环境中研究千年尺度的事件。
More and more paleoceanographic studies are performed on different size fractions of deep-sea sediments. Although it has been a controversial issue for some time, the bioturbation process depends on the particle size and can, in principle, decouple paleoceanographic records obtained in the same core. This problem is studied by using a simple mixing model which allows the derivation of analytical equations for both the expected phase shift and relative attenuation of signals carried by different size fractions. Depending on several parameters, the time shift and relative attenuation can be on the order of a few millenia and 50%, respectively. However, high sedimentation rates (> 10-20 cm/kyr) minimize these potential complications allowing us to study millenium-scale events in well-chosen sedimentary environments.