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首页> 外文期刊>Paleoceanography >Mg/Ca and Sr/Ca ratios in planktonic foraminifera: Proxies for upper water column temperature reconstruction
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Mg/Ca and Sr/Ca ratios in planktonic foraminifera: Proxies for upper water column temperature reconstruction

机译：浮游有孔虫中的Mg / Ca和Sr / Ca比：水柱上部温度重建的代理

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[1] Reliable temperature estimates from both surface and subsurface ocean waters are needed to reconstruct past upper water column temperature gradients and past oceanic heat content. This work examines the relationships between trace element ratios in fossil shells and seawater temperature for surface-dwelling foraminifera species, Globigerinoides ruber (white) and Globigerina bulloides, and deep-dwelling species, Globorotalia inflata, Globorotalia truncatulinoides (dextral and sinistral) and Pulleniatina obliquiloculata. Mg/Ca and Sr/Ca ratios in shells picked in 29 modern core tops from the North Atlantic Ocean are calibrated using calculated isotopic temperatures. Mg/Ca ratios on G. ruber and G. bulloides agree with published data and relationships. For deep- dwelling species, Mg/Ca calibration follows the equation Mg/Ca = 0.78 (+/- 0.04) x exp (0.051 (+/- 0.003) x T) with a significant correlation coefficient of R-2 = 0.74. Moreover, there is no significant difference between the different deep- dwellers analyzed. For the Sr/Ca ratio, the surface dwellers and P. obliquiloculata do not record any temperature dependence. For the Globorotalia species, the thermo dependence of Sr/Ca ratio can be described by a single linear relationship: Sr/Ca = ( 0.0182 (+/- 0.001) x T) + 1.097 (+/- 0.018), R-2 = 0.85. Temperature estimates with a 1 sigma error of +/- 2.0 degrees C and +/- 1.3 degrees C can be derived from the Mg/Ca and Sr/Ca ratios, respectively, as long as the Sr geochemistry in the ocean has been constant through time.
机译：[1]为了重建过去的上层水柱温度梯度和过去的海洋热量，需要从地表和地下海水获得可靠的温度估计。这项工作研究了表面居住的有孔虫物种，Globorgerinoides ruber（白色）和Globigerina Bulloides以及深居物种，Globorotalia inflata，Globorotalia truncatulinoides（右旋和鼻窦）和Pulleniatina obliquiloculata的化石贝壳中微量元素比率与海水温度之间的关系。 。使用计算出的同位素温度对在北大西洋29个现代岩心顶中采集的贝壳中的Mg / Ca和Sr / Ca比率进行校准。紫丁香和大丁香中的Mg / Ca比值与已公开的数据和关系一致。对于深居物种，Mg / Ca校准遵循方程Mg / Ca = 0.78（+/- 0.04）x exp（0.051（+/- 0.003）x T），相关系数显着为R-2 = 0.74。而且，所分析的不同深层居民之间没有显着差异。对于Sr / Ca比率，表面居民和斜生毕赤酵母没有记录任何温度依赖性。对于globorotalia物种，Sr / Ca比值的热依赖性可以通过一个线性关系来描述：Sr / Ca =（0.0182（+/- 0.001）x T）+ 1.097（+/- 0.018），R-2 = 0.85。可以从Mg / Ca和Sr / Ca比分别得出+/- 2.0摄氏度和+/- 1.3摄氏度的1 sigma误差的温度估算值，只要海洋中Sr的地球化学一直保持恒定即可。时间。

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