An integrated carbon and oxygen isotope approach to reconstructing past environmental variability in the northeast Atlantic Ocean
An integrated carbon and oxygen isotope approach to reconstructing past environmental variability in the northeast Atlantic Ocean
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DOI：
10.1016/j.palaeo.2019.03.005
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发表时间：
2019-06-01
影响因子：
3
通讯作者：
Slater, Sophie M.
中科院分区：
文献类型：
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作者：
Reynolds, David J.;Hall, Ian R.;Slater, Sophie M.
由于温度和海水同位素组成（δ O-18(w)）的综合影响，在不使用独立的δ O-18(w)代用物的情况下，往往无法使用来自海洋碳酸盐的氧同位素（δ O-18）记录来重建海水绝对温度。本文研究了长寿命的海洋双壳贝Glycymeris的碳同位素记录（δ C-13（壳））作为δ O-18(w)变率的代表。我们的分析表明，G. glycymeris δ C-13（壳）数据具有很强的个体发生趋势（-0.013 ppm / yr(-1), R = 0.98, P < 0.001, N = 51）。这些分析表明，结合个体发生趋势，54%的G. glycymeris δ C-13（壳）记录的变异可以用海洋susess效应、物理（盐度和河流输入）和生物过程（初级生产）的组合来解释。这些δ C-13（壳）数据与δ O-18（壳）和生长增量宽度序列（它们分别对海水温度和初级生产力敏感）相结合，可以为过去的环境变化提供新的见解，并有助于限制过去海水温度变化重建的不确定性。
The combined influence of temperature and the isotopic composition of the seawater (delta O-18(w)) often precludes the use of oxygen isotope (delta O-18) records, derived from marine carbonates, to reconstruct absolute seawater temperatures, without the application of an independent delta O-18(w) proxy. Here we investigate the application of carbon isotope records (delta C-13(shell)), derived from the long-lived marine bivalve Glycymeris glycymeris, as a proxy for delta O-18(w) variability. Our analyses indicate G. glycymeris delta C-13(shell) data derived from growth increments > 20 years of age contain strong ontogenetic trends (-0.013 parts per thousand yr(-1), R = 0.98, P < 0.001, N = 51). These analyses demonstrate that, coupled with the ontogenetic trends, 54% of the variability in G. glycymeris delta C-13(shell) records can be explained by a combination of the marine Suess effect and physical (salinity and riverine input) and biological processes (primary production). The application of these delta C-13(shell) data in conjunction with co-registered delta O-18(shell) and growth increment width series, each of which have been shown to be sensitive to seawater temperature and primary productivity respectively, can therefore provide new insights into past environmental variability and help constrain uncertainties on reconstructions of past seawater temperature variability.