Quantifying uncertainties in marine volcanic ash layer records from ocean drilling cores
Quantifying uncertainties in marine volcanic ash layer records from ocean drilling cores
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DOI：
10.1016/j.margeo.2014.08.010
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发表时间：
2014-11-01
期刊：
影响因子：
2.9
通讯作者：
Barnard, Nick H.
中科院分区：
文献类型：
--
作者：
Mahony, Sue H.;Sparks, R. S. J.;Barnard, Nick H.
海洋钻探提供了整个海洋沉积物的全球记录。1966年建立了一个国际合作海洋研究方案，国际海洋发现方案是这方面的最新表现。在每次考察期间，船上的科学团队都会生成和收集大量数据。可以认为，由于每次考察的工作人员和目标不同，船上岩心目视描述中记录的数据的一致性会有很大差异。在全球火山活动研究中使用船载VCD数据需要对VCD数据进行地面实况调查，以评估灰层报告的一致性，并确定岩心中火山灰层记录不足/过度的数量。对DSDP、ODP、IODP和JAMSTEC岩心中的大约1400个灰层进行了检查，发现平均70-75%的记录火山灰层如所述存在，平均17-20%记录过度，10-15%记录不足。造成这种差异的因素有很多，例如VCD格式、没有时间在船上对每一个灰层进行取样、取芯后灰层颜色发生了重大变化，或各次考察之间VCD记录和火山灰层识别和描述方案的差异。这些发现很重要，将使进一步的研究更有信心的基础上汇编的数据从船上VCD。(C)2014作者由爱思唯尔公司出版
Ocean drilling provides a global record of deposits throughout the oceans. An international collaborative ocean research programme was established in 1966, and the International Ocean Discovery Program (IODP) is the most recent manifestation of this. During each expedition a large amount of data are generated and collected by the shipboard science team. It could be suggested that due to the different staff and objectives during each expedition there would be significant variations in the consistency of data recorded in the shipboard visual core descriptions (VCDs). Use of shipboard VCD data in a global study of volcanism through time required the ground truthing of VCD data, to assess the consistency of ash layer reporting and to identify the amount of under/over recording of volcanic ash layers in cores. Approximately 1400 ash layers in DSDP, ODP, IODP and JAMSTEC cores were examined and it was found that on average 70-75% of recorded volcanic ash layers were present as described, an average of 17-20% were over recorded and 10-15% were under recorded. A number of factors could contribute to this variability, such as VCD format, lack of time for shipboard sampling of every ash layer, significant ash layer colour changes since time of coring, or differences in VCD recording and volcanic ash layer identification and description schemes between expeditions. These findings are important and will allow greater confidence in further studies based on data compiled from shipboard VCDs. (C) 2014 The Authors. Published by Elsevier B.V.