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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Magnetic characterisation of present-day deep-sea sediments and sources in the North Atlantic
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Magnetic characterisation of present-day deep-sea sediments and sources in the North Atlantic

机译：北大西洋现今深海沉积物和来源的磁性特征

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摘要

The North Atlantic plays a key role in global climate through formation of North Atlantic Depp Water, which drives the thermohaline circulation. To understand past and future climate change, it is essential to understand the processes occurring within the present-day North Atlantic but ocean-wide studies of present-day sediment distribution and sources are relatively sparse. Here, we use magnetic measurements to characterise the surface sediments of the North Atlantic and identify the major climatic and oceanorgraphic controls on their magnetic signatures. The magnetic data, and subsequent cluster analysis, identify distinct spatial patterns of sediment sources and transport pathways. Much of the sedimentary magnetic signal appears to be controlled by detrital inputs, especially of windblown dust, and ice-rafted debris (IRD), with a range of different sources. These sediment transport pathways can be validated by making direct comparison of the sediment magnetic properties with source rocks and soils, and with iceberg trajectory and observation data. The spatial distributions of the IRD-dominated sediments substantiate those mapped previously using lithological tracers, provide additional spatial information on sediment sources and pathways, and suggest that deep water currents are less significant than proposed in controlling present-day sediment mineralogy and distribution. The data form a present-day basis for comparison with glacial-stage IRD and dust distributions, and modes of ocean circulation.
机译：北大西洋通过形成北大西洋Depp水，在全球气候中发挥关键作用，该水推动了热盐环流。要了解过去和未来的气候变化，必须了解当今北大西洋内发生的过程，但是对当今沉积物分布和来源进行的全海域研究相对较少。在这里，我们使用磁测量来表征北大西洋的地表沉积物，并确定其磁特征的主要气候和海洋地理控制。磁数据和随后的聚类分析确定了沉积物源和输运路径的独特空间格局。大部分沉积磁信号似乎受碎屑输入的控制，尤其是风吹尘埃和浮冰碎屑（IRD）的碎屑输入，并具有一系列不同的来源。这些沉积物的输送途径可以通过直接比较沉积物的磁性与源岩和土壤以及冰山的轨迹和观测数据来验证。 IRD为主的沉积物的空间分布证实了先前使用岩性示踪剂测绘的沉积物的空间分布，提供了有关沉积物来源和途径的其他空间信息，并表明深水流在控制当今沉积物的矿物学和分布方面不如拟议的重要。这些数据构成了当今与冰河期IRD和沙尘分布以及海洋环流模式进行比较的基础。

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