Water isotopologues as a quantitative paleosalinity proxy
Water isotopologues as a quantitative paleosalinity proxy
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DOI：
10.1029/2010pa002043
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
A. Legrande;G. Schmidt
中科院分区：
文献类型：
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作者：
A. Legrande;G. Schmidt
[1]古盐度重建是古海洋学研究的一个目标，因为它们有可能提供对过去海洋环流的洞察。虽然温度重建已通过使用多个独立的代理进行了评估，现有的盐度重建的技能仍然很难量化。我们研究了两种不同的方法的适用性，使用一组耦合的水同位素启用的大气环流模式实验作为数值模拟的真实的气候系统。这些模拟全新世，在大约1000年的时间步长，明确跟踪水同位素和盐度的变化。我们的模拟表明，过去的盐度变化的定量重建仅基于推断的δ18Osw变化有很大的误差和不确定性。然而，我们发现成对的δ18Osw和δD变化（结合生物标志物和方解石代理）有望提供更好的定量估计盐度变化。
[1] Paleosalinity reconstructions are a goal of paleoceanographic study because of their potential to provide insight into past ocean circulation. While temperature reconstructions have been assessed by using multiple independent proxies, the skill of existing salinity reconstructions remains poorly quantified. We examine the applicability of two different approaches using a set of coupled water isotope–enabled general circulation model experiments as a numerical analog for the real climate system. These simulations for the Holocene, at roughly 1000 year time steps, explicitly track variability in both the water isotopologues and salinity. Our simulations suggest that quantitative reconstructions of past salinity variability based solely on inferred δ18Osw variability have very large errors and uncertainties. However, we find that paired δ18Osw and δD variability (from combining biomarker and calcite proxies) holds promise for providing better quantitative estimates of salinity variability.