Abrupt or gradual? Change point analysis of the late Pleistocene–Holocene climate record from Chew Bahir, southern Ethiopia

Abrupt or gradual? Change point analysis of the late Pleistocene–Holocene climate record from Chew Bahir, southern Ethiopia
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突然的还是渐进的?

DOI:
10.1017/qua.2018.30
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发表时间:
2018
影响因子:
2.3
通讯作者:
Schaebitz
Schaebitz
中科院分区:
地球科学3区
文献类型:
--
作者:
Trauth;Foerster;Junginger;Schaebitz

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我们对埃塞俄比亚裂谷南部Chew Bahir盆地的晚更新世-全新世湖泊沉积物记录进行了变化点分析,以确定过去气候变化的幅度和持续时间。在非洲湿润期(AHP)开始的240年(从~ 15700年到15460年)和持续结束的990年(从~4875年到3885年)期间,变化最为显著。AHP被一个与高纬度新森林期相一致的明显的干燥期所中断,该干燥期在~ 13260年突然开始(不到100年),并持续到~ 11730年。AHP之前的干湿转换可能反映了高纬度Dansgaard-Oeschger旋回,这是由~ 45-20 ka之间的钾记录与NorthGRIP冰芯记录的相互关联所表明的。这些发现可能有助于关于过去气候转变的幅度、持续时间和机制的辩论,以及它们对早期现代人类文化发展的可能影响。
We used a change point analysis on a late Pleistocene–Holocene lake-sediment record from the Chew Bahir basin in the southern Ethiopian Rift to determine the amplitude and duration of past climate transitions. The most dramatic changes occurred over 240 yr (from ~15,700 to 15,460 yr) during the onset of the African Humid Period (AHP), and over 990 yr (from ~4875 to 3885 yr) during its protracted termination. The AHP was interrupted by a distinct dry period coinciding with the high-latitude Younger Dryas stadial, which had an abrupt onset (less than ~100 yr) at ~13,260 yr and lasted until ~11,730 yr. Wet-dry-wet transitions prior to the AHP may reflect the high-latitude Dansgaard-Oeschger cycles, as indicated by cross-correlation of the potassium record with the NorthGRIP ice core record between ~45–20 ka. These findings may contribute to the debates regarding the amplitude, and duration and mechanisms of past climate transitions, and their possible influence on the development of early modern human cultures.
E. T. Brown、T. C. Johnson、C. A. Scholz、A. S. Cohen 和 J. W. King 对“热带非洲气候的突变与过去 55,000 年的两极跷跷板有关”的评论
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