Aligning and synchronization of MIS5 proxy records from Lake Ohrid (FYROM) with independently dated Mediterranean archives: implications for DEEP core chronology
Aligning and synchronization of MIS5 proxy records from Lake Ohrid (FYROM) with independently dated Mediterranean archives: implications for DEEP core chronology
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DOI：
10.5194/bg-13-2757-2016
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发表时间：
2016-05
期刊：
影响因子：
4.9
通讯作者：
G. Zanchetta;E. Regattieri;B. Giaccio;B. Wagner;R. Sulpizio;A. Francke;H. Vogel;L. Sadori;A. Masi;Gaia Sinopoli;J. Lacey;M. Leng;N. Leicher
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作者：
G. Zanchetta;E. Regattieri;B. Giaccio;B. Wagner;R. Sulpizio;A. Francke;H. Vogel;L. Sadori;A. Masi;Gaia Sinopoli;J. Lacey;M. Leng;N. Leicher
抽象的。在ICDP SCOPSCO项目期间在奥赫里德湖获得的深部沉积物序列，利用海洋同位素15-1阶段的火山地层学信息、旋回地层学和轨道调谐方法确定了年代。虽然这种方法适合于建立一个长期演替的一般年代学框架，但它不足以解决更详细的古气候学问题，如海洋和陆地记录之间或不同区域之间的气候事件的超前和滞后。在这里，我们展示了不同连接点的使用如何影响约140ka至70ka之间的旋回地层学和轨道调整，以及结果如何与直接/间接辐射测年地中海海洋和大陆代理记录相关联。这里提出的替代年龄模型与Francke等人最初提出的模型有一致的差异。(2015)同一时间间隔，特别是在MIS6-5E过渡阶段。根据这一新的年龄模型，来自深层沉积物记录的不同指标支持从冰期到间冰期的温度上升，这几乎与地中海西部观测到的海表面温度快速上升同步。结果表明，对独立的时间联系点的详细研究对于调整不同的记录和突出气候事件的异步性是多么重要。此外，Francke等人也提出了自己的观点。(2016)已将为Tephra OH-DP-0499提出的新年表纳入最终的深度年龄模型。这大大减少了深部地点年龄模型和这里提出的最后一次冰川-间冰期过渡模型之间的年代学差异。
Abstract. The DEEP site sediment sequence obtained during the ICDP SCOPSCO project at Lake Ohrid was dated using tephrostratigraphic information, cyclostratigraphy, and orbital tuning through the marine isotope stages (MIS) 15-1. Although this approach is suitable for the generation of a general chronological framework of the long succession, it is insufficient to resolve more detailed palaeoclimatological questions, such as leads and lags of climate events between marine and terrestrial records or between different regions. Here, we demonstrate how the use of different tie points can affect cyclostratigraphy and orbital tuning for the period between ca. 140 and 70 ka and how the results can be correlated with directly/indirectly radiometrically dated Mediterranean marine and continental proxy records. The alternative age model presented here shows consistent differences with that initially proposed by Francke et al. (2015) for the same interval, in particular at the level of the MIS6-5e transition. According to this new age model, different proxies from the DEEP site sediment record support an increase of temperatures between glacial to interglacial conditions, which is almost synchronous with a rapid increase in sea surface temperature observed in the western Mediterranean. The results show how a detailed study of independent chronological tie points is important to align different records and to highlight asynchronisms of climate events. Moreover, Francke et al. (2016) have incorporated the new chronology proposed for tephra OH-DP-0499 in the final DEEP age model. This has reduced substantially the chronological discrepancies between the DEEP site age model and the model proposed here for the last glacial-interglacial transition.