Evidence for humid conditions during the last glacial from leaf wax patterns in the loess–paleosol sequence El Paraíso, Central Spain
Evidence for humid conditions during the last glacial from leaf wax patterns in the loess–paleosol sequence El Paraíso, Central Spain
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西班牙中部埃尔帕拉伊索黄土-古土壤序列中的叶蜡图案表明末次冰期期间潮湿条件的证据
DOI：
10.1016/j.quaint.2016.01.061
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发表时间：
2016
影响因子：
2.2
通讯作者：
R. Zech
中科院分区：
文献类型：
--
作者：
I. Schäfer;M. Bliedtner;D. Wolf;D. Faust;R. Zech
地中海地区受到人为气候变化的首要影响，并遭受干旱化和干旱期的影响。重建过去的气候和环境变化可能有助于将这些后果置于背景中，确定潜在机制并改进预测。在这里，我们展示了来自西班牙中部埃尔帕拉伊索的黄土-古土壤序列 (LPS) 的叶蜡分析以及当今生长在那里的一些植物。几乎整个LPS中的长链烷烃以C29、C31和C33为主，表明存在草类和适应干旱的树种，例如杜松和油橄榄。然而，与海洋同位素阶段 (MIS) 2 (∼29–14 ka) 相关的样本具有较高的 C25、C27 和 C29 丰度，这可能表明存在较不适应干旱的落叶树木和更潮湿的条件。可以暂时解释正链烷酸模式以证实这些结果，但不够稳健，因为需要更多的植物物种进行比较。我们的发现和解释与气候模型研究相一致，这些研究表明 MIS 2 期间西风带和风暴路径向南移动，并有河流和湖泊记录，以及南欧温带树木的冰川保护区。化合物特异性同位素分析有望很快提供有关古气候和水文变化的更多信息，并有助于建立更精确和稳健的年龄控制。
The Mediterranean region is affected by the first consequences of anthropogenic climate change and suffers from aridization and drought periods. Reconstructing past climate and environmental changes might help to put those consequences into context, identify underlying mechanisms and improve predictions. Here we present leaf wax analyses for the loess–paleosol sequence (LPS) from El Paraíso, located in Central Spain and a selection of plants growing there today. The long-chainn-alkanes in almost the whole LPS are characterized by the dominance of C29, C31and C33, indicating the presence of grasses and drought-adapted tree species, such asJuniperusandOlea. However, samples correlated with marine isotope stage (MIS) 2 (∼29–14 ka) have higher abundances of C25, C27and C29, which may signal the presence of less drought-adapted deciduous trees and more humid conditions.n-Alkanoic acid patterns can tentatively be interpreted to confirm these results, but are less robust, because more plant species are needed for comparison. Our findings and interpretation are in line with climate modelling studies that suggest a southward shift of the westerlies and storm tracks during MIS 2, with fluvial and lacustrine records, and with glacial refugia for temperate trees in southern Europe. Compound-specific isotope analyses will hopefully soon provide additional information about paleoclimatic and -hydrologic changes and help establish a more precise and robust age control.
陆地植物中各个正构烷烃沿气候梯度的 ΔD 值 â 对沉积生物标志物记录的影响
影响因子：
3
作者：
Sachse;Gleixner
通讯作者：
Gleixner