Ice volume as a trigger for the amplification of Pleistocene millennial-scale climate fluctuations? A terrestrial perspective from Central Asia (Qaidam Basin)
冰量是更新世千年尺度气候波动放大的触发因素?
基本信息
- 批准号:323912628
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2016
- 资助国家:德国
- 起止时间:2015-12-31 至 2019-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Millennial-scale climate fluctuations have increasingly become recognized as a persistent feature of the warmer climates of the latest Pliocene and Early Pleistocene. However, when compared to the well-known millennial-scale fluctuations of the Late Pleistocene, the millennial-scale fluctuations under a warmer climate show markedly lower amplitudes and a lack of correlation to glacial-interglacial changes (i.e., lack of higher amplitudes during glacials compared to interglacials). One hypothesis to explain this difference is an ice-volume threshold that amplifies millennial-scale climate fluctuations and was not reached prior to the Mid-Pleistocene Transition (~1.2-0.7 Ma). The existence of the proposed threshold for the amplification of millennial-scale climate fluctuations and the exact role of northern hemisphere ice sheets as driver mechanisms, however, is still a matter of debate, especially for the intensification of northern hemisphere glaciation (iNHG; ~2.8-2.3 Ma). A solid evaluation of the influence of northern hemisphere ice sheets on the amplification of millennial-scale climate change urgently needs a sophisticated analysis of both marine and terrestrial records. While marine records get more and more available, there is still a lack of terrestrial-based climate records for iNHG. Therefore, it is planned to generate high-resolution (approx. 200 years) sedimentological (grain-size, XRF scanning) and palynological analyses of drill core SG-1b from the Qaidam Basin (NE Tibetan Plateau). The Qaidam Basin is located under the direct influence of the Siberian High, which is in turn directly linked to the amount of ice stored in the northern hemisphere. In addition, core SG-1b provides the opportunity to work at very high resolution and on the basis of maximum stratigraphic precision to answer the questions outlined below. It therefore provides an ideal target to unravel the role of northern hemisphere ice sheets as a trigger for amplitude changes in millennial-scale climate fluctuations. The main objectives of the proposed study are (i) to clarify if there are millennial-scale climate fluctuations of different amplitude in the Qaidam record during the last phase of iNHG (i.e., during MIS 104-94; 2.62-2.38 Ma), (ii) if yes, to figure out if they are related to glacial-interglacial changes, (iii) to clarify if an ice-volume threshold as a trigger for large-amplitude millennial-scale climate fluctuations exist during the early Pleistocene, (iv) to compare the resulting terrestrial data with available results from the marine realm, and (v) to decipher to what extent early Pleistocene glacials are comparable to those from the late Pleistocene.
千年尺度的气候波动越来越被认为是上新世晚期和更新世早期温暖气候的一个持续特征。然而,与众所周知的晚更新世千年尺度波动相比,气候变暖下的千年尺度波动显示出明显较低的振幅,并且与冰期-间冰期变化缺乏相关性(即冰期与间冰期相比缺乏更高的振幅)。解释这种差异的一种假设是,在中更新世过渡(~1.2-0.7 Ma)之前,没有达到一个放大千年尺度气候波动的冰量阈值。然而,提出的千年尺度气候波动放大阈值的存在以及北半球冰盖作为驱动机制的确切作用仍然存在争议,特别是北半球冰川作用的加剧(iNHG; ~2.8-2.3 Ma)。要切实评估北半球冰盖对千年尺度气候变化放大的影响,迫切需要对海洋和陆地记录进行精密分析。虽然海洋记录越来越多,但iNHG仍然缺乏基于陆地的气候记录。因此,计划生成高分辨率(约为。柴达木盆地受西伯利亚高压的直接影响,而西伯利亚高压又与北半球的冰储存量直接相关。此外,SG-1b岩心提供了以极高分辨率和最高地层精度工作的机会,以回答以下概述的问题。因此,它提供了一个理想的目标,以揭示北半球冰盖作为千年尺度气候波动幅度变化的触发因素的作用。提出的研究的主要目标是:(i)澄清在iNHG的最后阶段(即MIS 104-94期间)柴达木记录中是否存在不同幅度的千年尺度气候波动;2.62-2.38 Ma), (ii)如果有,则确定它们是否与冰期-间冰期变化有关,(iii)澄清在更新世早期是否存在触发千年尺度气候大波动的冰量阈值,(iv)将由此得到的陆地数据与海洋领域的现有结果进行比较,以及(v)破译早更新世冰川与晚更新世冰川在多大程度上可比较。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A late Pliocene to early Pleistocene (3.3–2.1 Ma) orbital chronology for the Qaidam Basin paleolake (NE Tibetan Plateau) based on the SG-1b drillcore record
- DOI:10.1127/nos/2020/0555
- 发表时间:2020-09
- 期刊:
- 影响因子:2.2
- 作者:Stefanie Kaboth‐Bahr;A. Koutsodendris;Yin Lu;Kai Nakajima;C. Zeeden;E. Appel;X. Fang;W. Rösler;O. Friedrich;J. Pross
- 通讯作者:Stefanie Kaboth‐Bahr;A. Koutsodendris;Yin Lu;Kai Nakajima;C. Zeeden;E. Appel;X. Fang;W. Rösler;O. Friedrich;J. Pross
Late Pliocene vegetation turnover on the NE Tibetan Plateau (Central Asia) triggered by early Northern Hemisphere glaciation
- DOI:10.1016/j.gloplacha.2019.06.001
- 发表时间:2019-09
- 期刊:
- 影响因子:3.9
- 作者:A. Koutsodendris;Frederik J. Allstädt;Oliver A. Kern;Ilias Kousis;F. Schwarz;Martina Vannacci;Amber Wou
- 通讯作者:A. Koutsodendris;Frederik J. Allstädt;Oliver A. Kern;Ilias Kousis;F. Schwarz;Martina Vannacci;Amber Wou
Sedimentological Evidence for Pronounced Glacial‐Interglacial Climate Fluctuations in NE Tibet in the Latest Pliocene to Early Pleistocene
- DOI:10.1029/2020pa003864
- 发表时间:2020-05
- 期刊:
- 影响因子:3.5
- 作者:Yin Lu;Nico Dewald;A. Koutsodendris;Stefanie Kaboth‐Bahr;W. Rösler;X. Fang;J. Pross;E. Appel
- 通讯作者:Yin Lu;Nico Dewald;A. Koutsodendris;Stefanie Kaboth‐Bahr;W. Rösler;X. Fang;J. Pross;E. Appel
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Professor Dr. Oliver Friedrich其他文献
Professor Dr. Oliver Friedrich的其他文献
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{{ truncateString('Professor Dr. Oliver Friedrich', 18)}}的其他基金
Pliocene dust storms across Asia as an analogue for future climate change?
亚洲上新世沙尘暴可以作为未来气候变化的类比吗?
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