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A MIS 9/MIS 8 speleothem record of hydrological variability from Macedonia (F.Y.R.O.M.)
Global and Planetary Change ( IF 3.9 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.gloplacha.2018.01.003
Eleonora Regattieri , Giovanni Zanchetta , Ilaria Isola , Petra Bajo , Natale Perchiazzi , Russell N. Drysdale , Chiara Boschi , John C. Hellstrom , Alexander Francke , Bernd Wagner

Abstract The period corresponding to Marine Isotope Stages 9 (MIS 9) offers the opportunity to study orbital and sub-orbital scale climate variability under boundary conditions different from those of better studied intervals such as the Holocene and the Last Interglacial. Yet, it is poorly represented in independently-dated continental archives around the Mediterranean Region. Here, we present a speleothem stable isotope record (δ18O and δ13C) from the Former Yugoslavian Republic of Macedonia (F.Y.R.O.M., southern Balkans), which consists of two periods of growth broadly covering the ca. 332 to 292 ka and the ca. 264 to 248 ka intervals (MIS 9e-b and late MIS 8). We interpret the speleothem δ18O as mostly related to regional hydrology, with variations that can be interpreted as due to changes in rainfall amount, with higher/lower values associated to drier/wetter condition. This interpretation is corroborated by a change in mineralogical composition between aragonite and calcite at ca. 328 ka, which marks increasing precipitation at the onset of MIS 9 and occurs within a trend of decreasing δ18O values. Also the comparison with the multiproxy climate record available from the nearby Lake Ohrid seems to support the proposed interpretation. The MIS 9e interglacial appears to be characterized by wettest conditions between ca. 326 and 321 ka, i.e. lasting ca. 5 kyr. Decreasing precipitation and enhanced millennial scale variability matches the glacial inception (MIS9 d to b), with drier events at ca. 319 ka (ca. 2 kyr long) and 310 ka (ca. 1 kyr long), and a major rainfall reduction between 306 and 298 ka. The latter is followed by a prominent wetter period between 298 and 295 ka, for which carbon data values suggest high infiltration rate. Rainfall decreases again after 295 ka, and remain low until the growth interruption at ca. 292 ka. Resumption of the growth and progressive soil development, expressed by the carbon isotope record, occurred during the late part of MIS 8. Despite the rather high temporal uncertainty (average 6 ka), the speleothem hydrological record complements the environmental information provided by the Lake Ohrid record and also fits well to the framework of regional and extra-regional variability, showing similarities with pollen records from southern and western Europe, both at orbital and at sub-orbital time scale.

中文翻译:

来自马其顿 (FYROM) 的 MIS 9/MIS 8 洞穴水文变化记录

摘要 对应于海洋同位素第 9 阶段 (MIS 9) 的时期提供了在边界条件下研究轨道和亚轨道尺度气候变化的机会,这些边界条件与全新世和末次间冰期等更好研究的间隔不同。然而,它在地中海地区周围独立年代的大陆档案中很少见。在这里,我们展示了来自前南斯拉夫的马其顿共和国(FYROM,巴尔干南部)的洞穴铁矿稳定同位素记录(δ18O 和 δ13C),它由两个大致覆盖约 332 至 292 ka 和约。264 至 248 ka 间隔(MIS 9e-b 和晚期 MIS 8)。我们将洞穴的 δ18O 解释为主要与区域水文有关,其变化可以解释为由于降雨量的变化,与干燥/潮湿条件相关的更高/更低的值。这种解释得到了大约 20 年文石和方解石矿物组成变化的证实。328 ka,这标志着在 MIS 9 开始时降水增加,并出现在 δ18O 值下降的趋势内。此外,与附近奥赫里德湖提供的多代理气候记录的比较似乎支持所提出的解释。MIS 9e 间冰期的特征似乎是在约 326 和 321 ka,即持久约。5 基尔。降水减少和千禧年尺度变异性增强与冰川开始(MIS9 d 至 b)相匹配,在约 319 ka(约 2 kyr 长)和 310 ka(约 1 kyr 长),306 至 298 ka 之间的降雨量大幅减少。后者之后是 298 至 295 ka 之间的显着湿润期,碳数据值表明高渗透率。降雨量在 295 ka 后再次减少,并且一直保持低水平,直到大约在生长中断。292 卡。MIS 8 后期发生了由碳同位素记录表示的生长恢复和土壤渐进发展。尽管时间不确定性相当高(平均 6 ka),但洞穴水文记录补充了奥赫里德湖提供的环境信息记录并且也非常适合区域和区域外变异的框架,在轨道和亚轨道时间尺度上与南欧和西欧的花粉记录显示出相似性。降雨量在 295 ka 后再次减少,并且一直保持低水平,直到大约在生长中断。292 卡。MIS 8 后期发生了由碳同位素记录表示的生长恢复和土壤渐进发展。尽管时间不确定性相当高(平均 6 ka),但洞穴水文记录补充了奥赫里德湖提供的环境信息记录并且也非常适合区域和区域外变异的框架,在轨道和亚轨道时间尺度上与南欧和西欧的花粉记录显示出相似性。降雨量在 295 ka 后再次减少,并且一直保持低水平,直到大约在生长中断。292 卡。MIS 8 后期发生了由碳同位素记录表示的生长恢复和土壤渐进发展。尽管时间不确定性相当高(平均 6 ka),但洞穴水文记录补充了奥赫里德湖提供的环境信息记录并且也非常适合区域和区域外变异的框架,在轨道和亚轨道时间尺度上与南欧和西欧的花粉记录显示出相似性。
更新日期:2018-03-01
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