End-member modelling as a tool for climate reconstruction-An Eastern Mediterranean case study.
End-member modelling as a tool for climate reconstruction-An Eastern Mediterranean case study.
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DOI：
10.1371/journal.pone.0185136
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Schulz H
中科院分区：
文献类型：
--
作者：
Beuscher S;Krüger S;Ehrmann W;Schmiedl G;Milker Y;Arz H;Schulz H
东地中海是北非、欧洲和小亚细亚陆源沉积物的汇集地。因此，它的沉积物提供了有关源区气候动力学和相关运输过程的宝贵信息。本文提出了一个高分辨率的沉积岩心M40/4_SL71数据集，该数据集采集于克里特岛西南部，跨度近180 kyr。分析了黏土矿物组成、粉粒级内粒度分布及主微量元素丰度。我们测试了端元模型在这些沉积学数据集上的潜力，作为重建源区气候变化和相关碎屑输入的工具。对于每个数据集，我们建模了三个端成员。所有端元都被划分为特定的物源和沉积过程。其中3个端元与撒哈拉沙尘输入有关，5个端元与河流泥沙输入有关。其中一个末端成员与冲积层密切相关。撒哈拉沙尘的粒度和粘土矿物数据集的末端成员通常表明，在海因里希事件期间，沙尘出口到东地中海的数量在干旱阶段增加，短期增加。在非洲湿润期，沙尘出口减少了，但可能没有完全停止。两个河流端段的负荷模式与北半球日晒有很强的关系，所有河流端段在非洲湿润期都记录了增强的输入。腐冲力末端很可能反映了缺氧腐冲力层中氧化还原敏感元素的固定。我们的研究结果表明，端元模型是解释广泛和多学科数据集的有价值的工具。
The Eastern Mediterranean Sea is a sink for terrigenous sediments from North Africa, Europe and Asia Minor. Its sediments therefore provide valuable information on the climate dynamics in the source areas and the associated transport processes. We present a high-resolution dataset of sediment core M40/4_SL71, which was collected SW of Crete and spans the last ca. 180 kyr. We analysed the clay mineral composition, the grain size distribution within the silt fraction, and the abundance of major and trace elements. We tested the potential of end-member modelling on these sedimentological datasets as a tool for reconstructing the climate variability in the source regions and the associated detrital input. For each dataset, we modelled three end members. All end members were assigned to a specific provenance and sedimentary process. In total, three end members were related to the Saharan dust input, and five were related to the fluvial sediment input. One end member was strongly associated with the sapropel layers. The Saharan dust end members of the grain size and clay mineral datasets generally suggest enhanced dust export into the Eastern Mediterranean Sea during the dry phases with short-term increases during Heinrich events. During the African Humid Periods, dust export was reduced but may not have completely ceased. The loading patterns of two fluvial end members show a strong relationship with the Northern Hemisphere insolation, and all fluvial end members document enhanced input during the African Humid Periods. The sapropel end member most likely reflects the fixation of redox-sensitive elements within the anoxic sapropel layers. Our results exemplify that end-member modelling is a valuable tool for interpreting extensive and multidisciplinary datasets.
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从撒哈拉尘埃通量估算的非洲潮湿时期的强度。
影响因子：
3.7
作者：
Ehrmann W;Schmiedl G;Beuscher S;Krüger S
通讯作者：
Krüger S
DOI：
10.1016/s0031-0182(00)00056-0
发表时间：
2000-05-15
影响因子：
3
作者：
Foucault, A;Mélières, F
通讯作者：
Mélières, F
DOI：
10.1016/s0967-0645(96)00096-3
发表时间：
1997-01-01
影响因子：
3
作者：
Guerzoni, S;Molinaroli, E;Chester, R
通讯作者：
Chester, R
影响因子：
5.2
作者：
Caquineau, S;Gaudichet, A;Chatenet, B
通讯作者：
Chatenet, B
影响因子：
64.8
作者：
Grant, K. M.;Rohling, E. J.;Roberts, A. P.
通讯作者：
Roberts, A. P.