Accurate dating of stalagmites from low seasonal contrast tropical Pacific climate using Sr 2D maps, fabrics and annual hydrological cycles.
Accurate dating of stalagmites from low seasonal contrast tropical Pacific climate using Sr 2D maps, fabrics and annual hydrological cycles.
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DOI：
10.1038/s41598-021-81941-x
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发表时间：
2021-01-26
影响因子：
4.6
通讯作者：
Mattey DP
中科院分区：
文献类型：
--
作者：
Faraji M;Borsato A;Frisia S;Hellstrom JC;Lorrey A;Hartland A;Greig A;Mattey DP
热带太平洋石笋通常受到测年不确定性的影响，因为它们的铀浓度较低和/或初始230度含量较高。这给在一个易受气候变化影响的区域确定干旱和雨季的可靠趋势和周期带来了问题。在这里，我们使用同步加速器微X射线荧光二维锶浓度测绘和生长纹层光学成像来约束库克群岛石笋的年代学。LA-ICPMS产生的一维镁、锶、钡和钠的变化序列被锚定在二维锶和光学图谱上。用主成分分析检验了镁、锶、钡、钠的年水文意义，结果表明，镁、钠与旱季、风输送的海洋气溶胶有关，与寄主岩源的锶、钡特征相似。然后利用微量元素年带法生成一个日历年主年表，在336年中测年不确定度最大为 ± 15年。我们的方法表明，可以从热带环境中形成的洞穴中获得准确的年表和耦合的水文气候指标，在热带环境中，低季节性和有问题的U-Th测年将阻碍使用高分辨率气候指标数据集。
Tropical Pacific stalagmites are commonly affected by dating uncertainties because of their low U concentration and/or elevated initial 230Th content. This poses problems in establishing reliable trends and periodicities for droughts and pluvial episodes in a region vulnerable to climate change. Here we constrain the chronology of a Cook Islands stalagmite using synchrotron µXRF two-dimensional mapping of Sr concentrations coupled with growth laminae optical imaging constrained by in situ monitoring. Unidimensional LA-ICP-MS-generated Mg, Sr, Ba and Na variability series were anchored to the 2D Sr and optical maps. The annual hydrological significance of Mg, Sr, Ba and Na was tested by principal component analysis, which revealed that Mg and Na are related to dry-season, wind-transported marine aerosols, similar to the host-rock derived Sr and Ba signatures. Trace element annual banding was then used to generate a calendar-year master chronology with a dating uncertainty maximum of ± 15 years over 336 years. Our approach demonstrates that accurate chronologies and coupled hydroclimate proxies can be obtained from speleothems formed in tropical settings where low seasonality and problematic U–Th dating would discourage the use of high-resolution climate proxies datasets.
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利用华北北京石花洞季节性微量元素循环优化石笋年代学
影响因子：
4.6
作者：
Ban F;Baker A;Marjo CE;Duan W;Li X;Han J;Coleborn K;Akter R;Tan M;Nagra G
通讯作者：
Nagra G
影响因子：
5
作者：
Belli, R.;Borsato, A.;Greig, A.
通讯作者：
Greig, A.
DOI：
10.1002/joc.2412
发表时间：
2012-11-01
期刊：
INTERNATIONAL JOURNAL OF CLIMATOLOGY
影响因子：
--
作者：
Diamond, H. J.;Lorrey, A. M.;Levinson, D. H.
通讯作者：
Levinson, D. H.
影响因子：
5.3
作者：
Hellstrom, JC;McCulloch, MT
通讯作者：
McCulloch, MT
影响因子：
5
作者：
Borsato, Andrea;Frisia, Silvia;Susini, Jean
通讯作者：
Susini, Jean