Classifying past climate change in the Chew Bahir basin, southern Ethiopia, using recurrence quantification analysis

Classifying past climate change in the Chew Bahir basin, southern Ethiopia, using recurrence quantification analysis
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使用递归量化分析对埃塞俄比亚南部丘巴赫盆地过去的气候变化进行分类

DOI:
10.1007/s00382-019-04641-3
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发表时间:
2019
期刊:
影响因子:
4.6
通讯作者:
Schaebitz
Schaebitz
中科院分区:
地球科学2区
文献类型:
--
作者:
Trauth;Duesing;Foerster;Kraemer;Marwan;Maslin;Schaebitz

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周伯海尔钻探项目(CBDP)旨在通过对记录了周伯海尔盆地环境变化的沉积岩心的分析,测试气候与非洲演化之间的可能联系。在这个统计项目中,我们认为Chew Burir古湖是一个动力系统,由其不同组成部分之间的相互作用组成,如水体、湖下沉积物和生活在湖内和湖周围的生物。循环是这类动力系统的一个共同特征,系统状态中的循环模式反映了典型的影响。识别和定义这些影响对我们理解系统的动态有很大的帮助。周伯勒盆地降水、蒸发和风速的不同反复变化可能导致湖泊中类似(但不完全相同)的条件(例如,湖的深度和面积、湖水的碱度和盐度、水体中的物种组合以及沉积物中的成岩作用)。循环图(RP)是系统内此类循环状态的图形显示。随后引入了复杂性测量,以补充复发曲线图的目测检查,并提供用于复发量化分析(RQA)的定量描述。我们在此介绍并讨论了在CBDP期间收集的六个短(约17米)沉积物岩芯的环境记录的RQA结果,这些岩芯跨越了过去45个百万年。对这些记录中不同类型的可变性和过渡性进行了分类,以增进我们对生物圈对气候变化的反应,特别是该地区人类的反应的了解。
The Chew Bahir Drilling Project (CBDP) aims to test possible linkages between climate and evolution in Africa through the analysis of sediment cores that have recorded environmental changes in the Chew Bahir basin. In this statistical project we consider the Chew Bahir palaeolake to be a dynamical system consisting of interactions between its different components, such as the waterbody, the sediment beneath lake, and the organisms living within and around the lake. Recurrence is a common feature of such dynamical systems, with recurring patterns in the state of the system reflecting typical influences. Identifying and defining these influences contributes significantly to our understanding of the dynamics of the system. Different recurring changes in precipitation, evaporation, and wind speed in the Chew Bahir basin could result in similar (but not identical) conditions in the lake (e.g., depth and area of the lake, alkalinity and salinity of the lake water, species assemblages in the water body, and diagenesis in the sediments). Recurrence plots (RPs) are graphic displays of such recurring states within a system. Measures of complexity were subsequently introduced to complement the visual inspection of recurrence plots, and provide quantitative descriptions for use in recurrence quantification analysis (RQA). We present and discuss herein results from an RQA on the environmental record from six short (< 17 m) sediment cores collected during the CBDP, spanning the last 45 kyrs. The different types of variability and transitions in these records were classified to improve our understanding of the response of the biosphere to climate change, and especially the response of humans in the area.
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