Reconstruction of late Holocene autumn/winter precipitation variability in SW Romania from a high-resolution speleothem trace element record
Reconstruction of late Holocene autumn/winter precipitation variability in SW Romania from a high-resolution speleothem trace element record
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DOI：
10.1016/j.epsl.2018.07.027
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发表时间：
2018-10
影响因子：
5.3
通讯作者：
Sophie F. Warken;J. Fohlmeister;A. Schröder‐Ritzrau;S. Constantin;C. Spötl;A. Gerdes;J. Esper;N. Frank;J. Arps;Mihai Terente;D. Riechelmann;A. Mangini;D. Scholz
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文献类型：
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作者：
Sophie F. Warken;J. Fohlmeister;A. Schröder‐Ritzrau;S. Constantin;C. Spötl;A. Gerdes;J. Esper;N. Frank;J. Arps;Mihai Terente;D. Riechelmann;A. Mangini;D. Scholz
我们展示了罗马尼亚西南部石笋的第一个高分辨率微量元素（Mg/Ca、Sr/Ca、Ba/Ca）记录，涵盖过去 3.6 ka，这为定量气候重建提供了潜力。精确的年龄控制基于三种独立的测年方法，特别是最近 250 年，其中化学层计数与 20 世纪放射性碳弹峰值的识别和 230Th/U 测年相结合。对滴水和洞穴植物元素变化的长期洞穴监测和模型模拟表明，与降水相关的过程是洞穴植物镁/钙比的主要驱动因素。根据仪器气候数据进行的校准显示，洞穴中的镁/钙比值与秋冬季（10 月至 3 月）降水存在显着的反相关性（r = -0.61，p < 0.01），在考虑年龄不确定性和自相关性时，这种相关性在统计上是稳健的。这种关系用于定量重建秋/冬季降水。在全新世晚期，我们的数据表明喀尔巴阡/巴尔干地区过去区域冬季水气候的异质模式，以及北大西洋强迫的主导影响的间歇性减弱。与其他区域古水文重建一致，观测到的变化揭示了周期性出现的强烈的西北-东南水文气候梯度。我们假设，这种模式是由于北大西洋强迫和其他气候特征（例如东大西洋/俄罗斯西部（EAWR）模式）的汇合而导致 NAO 影响范围的东部边缘在中欧东部发生变化造成的。
We present the first high-resolution trace element (Mg/Ca, Sr/Ca, Ba/Ca) record from a stalagmite in southwestern Romania covering the last 3.6 ka, which provides the potential for quantitative climate reconstruction. Precise age control is based on three independent dating methods, in particular for the last 250 yr, where chemical lamina counting is combined with the identification of the 20th century radiocarbon bomb peak and230Th/U dating. Long-term cave monitoring and model simulations of drip water and speleothem elemental variability indicate that precipitation-related processes are the main drivers of speleothem Mg/Ca ratios. Calibration against instrumental climate data shows a significant anti-correlation of speleothem Mg/Ca ratios with autumn/winter (October to March) precipitation (r = −0.61,p< 0.01), which is statistically robust when considering age uncertainties and auto-correlation. This relationship is used to develop a quantitative reconstruction of autumn/winter precipitation.During the late Holocene, our data suggest a heterogeneous pattern of past regional winter hydroclimate in the Carpathian/Balkan realm, along with intermittent weakening of the dominant influence of North Atlantic forcing. In agreement with other regional paleo-hydrological reconstructions, the observed variability reveals periodically occurring strong NW–SE hydro-climate gradients. We hypothesize, that this pattern is caused by shifts of the eastern edge of the area of influence of the NAO across central-eastern Europe due to the confluence of North Atlantic forcing, and other climatic features such as the East Atlantic/Western Russia (EAWR) pattern.