利用高分辨率海洋模型追踪晚始新世南极冰山融化情况,探寻 IRD 的可能出处

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Mark Vinz Elbertsen, Erik van Sebille, Peter Kristian Bijl
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引用次数: 0

摘要

摘要始新世-更新世过渡时期的特征是南极大规模冰盖的形成。然而,人们发现了始新世早期冰川作用的证据,包括在南奥克尼微大陆上的大洋钻探计划第 113 航段 696 号站点发现的冰器残片(Carter 等人,2017 年)。这表明,在始新世晚期,海洋末端冰川应该出现在威德尔海南部地区,为南奥克尼产生了足够大的冰山,使其能够在始新世的高海洋温度下生存下来。在这里,我们利用拉格朗日冰山追踪技术,在晚始新世的高分辨率涡解海洋模型(Nooteboom 等人,2022 年)中显示,在晚始新世期间,从今天的菲尔奇纳冰架地区和德龙宁毛德地近海释放的冰山可以到达南奥克尼微大陆。始新世温暖气候下的高融化率要求冰山的初始质量至少在 1 亿吨左右,冰山厚度为几十米,这样才能到达南奥克尼微大陆。虽然这些尺寸在当今南极洲周围常见冰山尺寸范围的大端,但最低估计值并非不可行,因此,本研究证实了之前的发现,即冰川作用和冰山碎裂在晚始新世是可能发生的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Possible provenance of IRD by tracing late Eocene Antarctic iceberg melting using a high-resolution ocean model
Abstract. The Eocene-Oligocene Transition is characterised by the inception of the large-scale Antarctic ice sheet. However, evidence of earlier glaciation during the Eocene has been found, including the presence of ice-rafted debris at Ocean Drilling Program Leg 113 Site 696 on the South Orkney Microcontinent (Carter et al., 2017). This suggests marine-terminating glaciers should have been present in the southern Weddell Sea region during the late Eocene, generating sufficiently large icebergs to South Orkney to survive the high Eocene ocean temperatures. Here, we use Lagrangian iceberg tracing in a high-resolution eddy-resolving ocean model of the late Eocene (Nooteboom et al., 2022) to show that icebergs released from offshore the present-day Filchner Ice Shelf region and Dronning Maud Land could reach the South Orkney Microcontinent during the late Eocene. The high melt rates under the Eocene warm climate require a minimum initial iceberg mass on the order of 100 Mt and an iceberg thickness of several tens of metres to be able to reach the South Orkney Microcontinent. Although these sizes are at the larger end of the present-day range of common iceberg sizes around Antarctica, the minimum estimates are not unfeasible and, hence, the present study confirms previous findings suggesting glaciation and iceberg calving were possible in the late Eocene.
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来源期刊
Climate of The Past
Climate of The Past 地学-气象与大气科学
CiteScore
7.40
自引率
14.00%
发文量
120
审稿时长
4-8 weeks
期刊介绍: Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.
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