No change in the neodymium isotope composition of deep water exported from the North Atlantic on glacial-interglacial time scales
No change in the neodymium isotope composition of deep water exported from the North Atlantic on glacial-interglacial time scales
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DOI：
10.1130/g23204a.1
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发表时间：
2007-01-01
期刊：
影响因子：
5.8
通讯作者：
Prytulak, Julie
中科院分区：
文献类型：
--
作者：
Foster, Gavin L.;Vance, Derek;Prytulak, Julie
量化过去的环流是测试我们对现代和未来气候系统理解的重要组成部分。海洋沉淀物中钕（Nd）的同位素组成作为过去循环模式的记录器具有相当大的前景，但其强大的应用需要端元组成的知识，以正确地解卷积下游信号。在这里，我们表明，使用原位，高时间分辨率分析的铁锰结壳从北大西洋，在更广泛的北方半球冰盖的时候，深水的Nd同位素组成与现代的间冰期值没有什么不同。这一结果令人惊讶，但大大简化了钕同位素作为过去大西洋环流强度和模式示踪剂的使用。
Quantifying past circulation is a vital part of testing our understanding of the modern and future climate system. The isotopic composition of neodymium (Nd) in marine precipitates has considerable promise as a recorder of past circulation patterns, but its robust application requires knowledge of the end-member compositions in order to correctly deconvolute a downstream signal. We show here, using in situ, high temporal resolution analyses of ferromanganese crusts from the North Atlantic, that the Nd isotopic composition of deep water during times of much more extensive Northern Hemisphere ice cover was no different than the modern-day interglacial value. This result is surprising, but greatly simplifies the use of Nd isotopes as tracers of the strength and patterns of circulation in the Atlantic in the past.