Do paleoclimate proxies agree? A test comparing 19 late Holocene climate and sea-ice reconstructions from Icelandic marine and lake sediments
Do paleoclimate proxies agree? A test comparing 19 late Holocene climate and sea-ice reconstructions from Icelandic marine and lake sediments
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DOI：
10.1002/jqs.1487
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发表时间：
2011-08-01
影响因子：
2.3
通讯作者：
Vare, Lindsay L.
中科院分区：
文献类型：
--
作者：
Axford, Yarrow;Andresen, Camilla S.;Vare, Lindsay L.
保存在沉积物中的地球化学、矿物学和生物学指标被广泛用于重建过去的气候变化，但代用指标作为气候指标的效用通过实验室实验、现代空间校准或与仪器气候数据的下芯比较得到验证的程度不同。多代理研究提供了另一种评估代理解释的方法。本文提出了一个多代理评估比较19个次百年解决晚全新世代理记录，涵盖公元300-1900年期间，从7个冰岛海洋和湖泊的核心网站。我们采用简单的代理重建之间的统计比较，以评估其相关性随着时间的推移，并最终，他们的效用作为区域气候的代理。研究的指标包括底栖有孔虫和浮游有孔虫的氧同位素组成、海冰生物标志物IP 25的丰度、海洋沉积物中的外来石英（冰岛周围流冰的替代物）、海洋碳酸盐丰度、总有机碳浓度、chironomicl组合、湖泊生物硅和湖泊沉积物中的碳/氮比。大多数经过检验的代用记录，包括温度和海冰代用记录，在数百年的时间尺度上彼此之间有很强的相关性，因此似乎确实记录了区域气候的变化。版权所有（C）2011约翰威利父子有限公司
Geochemical, mineralogical and biological indicators preserved in sediments are widely used to reconstruct past climate change, but proxies differ in the degree to which their utility as climate indicators has been validated via laboratory experiments, modern spatial calibrations, or down-core comparisons with instrumental climate data. Multi-proxy studies provide another means of evaluating interpretations of proxies. This paper presents a multi-proxy assessment comparing 19 sub-centennially resolved late Holocene proxy records, covering the period 300-1900 AD, from seven Icelandic marine and lacustrine core sites. We employ simple statistical comparisons between proxy reconstructions to evaluate their correlations over time and, ultimately, their utility as proxies for regional climate. Proxies examined include oxygen isotopic composition of benthic and planktonic foraminifera, abundance of the sea-ice biomarker IP25, allochthonous quartz in marine sediments (a proxy for drift ice around Iceland), marine carbonate abundance, total organic carbon concentration, chironomicl assemblages, lacustrine biogenic silica and carbon/nitrogen ratios in lake sediments. Most of the examined proxy records, including temperature and sea-ice proxies, correlate strongly with each other over multi-centennial timescales, and thus do appear to record changes in regional climate. Copyright (C) 2011 John Wiley & Sons, Ltd.