用稳定的更新世海岸线的正演地层模型改进熔融模式

IF 2.8 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Patrick Boyden, Paolo Stocchi, Alessio Rovere
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引用次数: 0

摘要

摘要末次间冰期(约128-116 ka)的最暖高峰被认为是一个过程模拟,经常被研究以更好地了解未来变暖气候对地球系统的影响。特别是,为了更好地约束冰盖对末次间冰期海平面峰值的贡献,通过对古相对海平面指标的野外观测已经做出了重大努力。沿着热带海岸边缘,这些观测主要基于化石浅层珊瑚礁序列,这也提供了收集可靠的u系列时间限制的可能性。然而,许多更新世珊瑚礁序列的保存往往仅限于间冰期内一系列离散的相对海平面位置,在那里保存了适合定年的珊瑚。反过来,这限制了我们理解整个间冰期古相对海平面持续演变的能力,也影响了揭示亚平稳海平面振荡存在和模式的可能性。虽然岩石地层和地貌性质的解释通常用于克服这一障碍,但在处理缺失的相或不完整的层序时,地质解释可能会出现与主观性相关的问题。在这项研究中,我们试图从传统的方法退后一步,为马达加斯加西南部(印度洋)的一个地点生成合成第四纪亚热带边缘珊瑚礁的光谱。我们使用Dionisos正演地层模型(Beicip-Franlab)在该位置建立了一个化石礁。在每个模式运行中,我们使用由一个耦合的ice - selen冰川均衡调整模式产生的不同的格陵兰岛和南极洲冰盖融化情景。然后用合成的珊瑚礁序列对照地层记录来测试这些融化情景。我们认为这种地层模拟可以为解释末次间冰期礁层序提供进一步的定量控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Refining patterns of melt with forward stratigraphic models of stable Pleistocene coastlines
Abstract. The warmest peak of the Last Interglacial (ca. 128–116 ka) is considered a process analogue and is often studied to better understand the effects of a future warmer climate on the Earth's system. In particular, significant efforts have been made to better constrain ice sheet contributions to the peak Last Interglacial sea level through field observation of paleo relative sea level indicators. Along tropical coastal margins, these observations are predominantly based on fossil shallow coral reef sequences, which also provide the possibility of gathering reliable U-series chronological constraints. However, the preservation of many Pleistocene reef sequences is often limited to a series of discrete relative sea level positions within the interglacial, where corals suitable for dating were preserved. This, in turn, limits our ability to understand the continuous evolution of paleo relative sea level through an entire interglacial, also affecting the possibility of unraveling the existence and pattern of sub-stadial sea level oscillations. While the interpretation of lithostratigraphic and geomorphologic properties is often used to overcome this hurdle, geological interpretation may present issues related to subjectivity when dealing with missing facies or incomplete sequences. In this study, we try to step back from a conventional approach, generating a spectrum of synthetic Quaternary subtropical fringing reefs for a site in southwestern Madagascar (Indian Ocean). We use the Dionisos forward stratigraphic model (from Beicip-Franlab) to build a fossil reef at this location. In each model run, we use distinct Greenland and Antarctica ice sheet melt scenarios produced by a coupled ANICE–SELEN glacial isostatic adjustment model. The resulting synthetic reef sequences are then used test these melt scenarios against the stratigraphic record. We propose that this sort of stratigraphic modeling may provide further quantitative control when interpreting Last Interglacial reef sequences.
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来源期刊
Earth Surface Dynamics
Earth Surface Dynamics GEOGRAPHY, PHYSICALGEOSCIENCES, MULTIDISCI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
5.40
自引率
5.90%
发文量
56
审稿时长
20 weeks
期刊介绍: Earth Surface Dynamics (ESurf) is an international scientific journal dedicated to the publication and discussion of high-quality research on the physical, chemical, and biological processes shaping Earth''s surface and their interactions on all scales.
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