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Integrating timescales with time-transfer functions:a practical approach for an INTIMATE database

机译:将时间尺度与时间传递函数集成:INTImaTE数据库的实用方法

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摘要

The purpose of the INTIMATE project is to integrate palaeo-climate information from terrestrial, ice and marine records so that the timing of environmental response to climate forcing can be compared in both space and time. One of the key difficulties in doing this is the range of different methods of dating that can be used across different disciplines. For this reason, one of the main outputs of INTIMATE has been to use an event-stratigraphic approach which enables researchers to co-register synchronous events (such as the deposition of tephra from major volcanic eruptions) in different archives (Blockley et al., 2012). However, this only partly solves the problem, because it gives information only at particular short intervals where such information is present. Between these points the ability to compare different records is necessarily less precise chronologically. What is needed therefore is a way to quantify the uncertainties in the correlations between different records, even if they are dated by different methods, and make maximum use of the information available that links different records.This paper outlines the design of a database that is intended to provide integration of timescales and associated environmental proxy information. The database allows for the fact that all timescales have their own limitations, which should be quantified in terms of the uncertainties quoted. It also makes use of the fact that each timescale has strengths in terms of describing the data directly associated with it. For this reason the approach taken allows users to look at data on any timescale that can in some way be related to the data of interest, rather than specifying a specific timescale or timescales which should always be used. The information going into the database is primarily: proxy information (principally from sediments and ice cores) against depth, age depth models against reference chronologies (typically IntCal or ice core), and time-transfer functions that relate different timescales to each other, through the use of event stratigraphies or global phenomena such as cosmogenic isotope production rate variations.
机译:INTIMATE项目的目的是整合来自陆地,冰和海洋记录的古气候信息,以便可以在空间和时间上比较环境对气候强迫的响应时间。这样做的主要困难之一是可以在不同学科中使用的各种约会方法。出于这个原因,INTIMATE的主要输出之一是使用事件地层学方法,该方法使研究人员能够在不同的档案中共同记录同步事件(例如主要火山喷发中的提非拉沉积)(Blockley等, 2012)。但是,这仅部分解决了该问题,因为它仅在存在此类信息的特定短间隔内提供信息。在这些点之间,按时间顺序比较不同记录的能力必然不太精确。因此,我们需要一种量化不同记录之间相关性不确定性的方法,即使这些不确定性是通过不同的方法标注日期的,也可以最大程度地利用链接不同记录的可用信息。旨在提供时间表和相关环境代理信息的集成。该数据库考虑到所有时标都有其自身的局限性,应根据所引用的不确定性对其进行量化。它还利用了以下事实:每个时标在描述与之直接相关的数据方面都有优势。由于这个原因,所采用的方法允许用户查看可以以某种方式与感兴趣的数据相关的任何时间尺度上的数据,而不是指定应始终使用的特定时间尺度或多个时间尺度。进入数据库的信息主要是:针对深度的代理信息(主要来自沉积物和冰芯),针对参考年代的年龄深度模型(通常是IntCal或冰芯),以及通过不同时间尺度相互关联的时间传递函数使用事件地层学或全球性现象,例如宇宙成因同位素生产率的变化。

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