Collapse of the Last Eurasian Ice Sheet in the North Sea Modulated by Combined Processes of Ice Flow, Surface Melt, and Marine Ice Sheet Instabilities
Collapse of the Last Eurasian Ice Sheet in the North Sea Modulated by Combined Processes of Ice Flow, Surface Melt, and Marine Ice Sheet Instabilities
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北海最后一个欧亚冰盖的崩塌是由冰流、表面融化和海洋冰盖不稳定的综合过程调节的
DOI：
10.1029/2020jf005755
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Gandy N
中科院分区：
文献类型：
--
作者：
Gandy N
英国-爱尔兰冰盖和芬诺斯堪的纳维亚冰盖的汇合和崩溃的记录被北海所掩盖，阻碍了末次冰期循环期间欧亚冰盖复合体这一部分的冰川动力学的重建。以前对北海冰川消退的数值模拟也很难捕捉到不列颠-爱尔兰和芬诺斯堪的亚冰盖的汇合和分离。我们运行了一个合奏的70个实验模拟北海的冰川消退23和18万年BP使用BISICLES冰盖模型。一套新的定量模型-数据比较工具被用来识别与冰流、边缘位置和退缩年龄的经验数据相匹配的冰消模拟，从而可以与大量的经验数据进行比较。在与经验数据最匹配的集合成员中，北海通过海洋挪威海峡冰流的崩溃而消退，解开了英国-爱尔兰冰盖和芬诺斯堪的纳维亚冰盖之间的汇合处。挪威海峡冰流的变薄导致表面温度反馈，快速的接地线撤退和冰流加速，进一步推动英国-爱尔兰和芬诺斯堪的亚冰盖的分离。这些模拟的北海冰川消退符合大多数的经验证据，因此提供物理上合理的见解，是一致的重建的基础上的经验证据，并允许模型和数据之间的定量比较。
The record of the confluence and collapse of the British‐Irish Ice Sheet and the Fennoscandian Ice Sheet is obscured by the North Sea, hindering reconstructions of the glacial dynamics of this sector of the Eurasian Ice Sheet complex during the last glacial cycle. Previous numerical simulations of the deglaciation of the North Sea have also struggled to capture the confluence and separation of the British‐Irish and Fennoscandian Ice Sheets. We ran an ensemble of 70 experiments simulating the deglaciation of the North Sea between 23 and 18 ka BP using the BISICLES ice sheet model. A novel suite of quantitative model‐data comparison tools was used to identify plausible simulations of deglaciation that match empirical data for ice flow, margin position, and retreat ages, allowing comparisons to large amounts of empirical data. In ensemble members that best match the empirical data, the North Sea deglaciates through the collapse of the marine‐based Norwegian Channel Ice Stream, unzipping the confluence between the British‐Irish Ice Sheet and the Fennoscandian Ice Sheet. Thinning of the Norwegian Channel Ice Stream causes surface temperature feedbacks, rapid grounding line retreat, and ice stream acceleration, further driving separation of the British‐Irish and the Fennoscandian Ice Sheets. These simulations of the North Sea deglaciation conform with the majority of empirical evidence, and therefore provide physically plausible insights that are consistent with reconstructions based on the empirical evidence, and permit a quantitative comparison between model and data.
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DOI：
10.1016/j.cageo.2006.06.016
发表时间：
2007-02
期刊：
Comput. Geosci.
影响因子：
--
作者：
Yingkui Li;Jacob Napieralski;J. Harbor;A. Hubbard
通讯作者：
Yingkui Li;Jacob Napieralski;J. Harbor;A. Hubbard
制定质量保证程序，用于评估与最后一个英国-爱尔兰冰盖冰川消融相关的遗留地质年代学数据
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
D. Small;C. Clark;R. Chiverrell;R. Smedley;M. Bateman;G. Duller;J. Ely;D. Fabel;A. Medialdea;S. Moreton
通讯作者：
S. Moreton
影响因子：
2.3
作者：
D. Evans;D. Roberts;M. Bateman;A. Medialdea;J. Ely;S. Moreton;C. Clark;D. Fabel
通讯作者：
D. Evans;D. Roberts;M. Bateman;A. Medialdea;J. Ely;S. Moreton;C. Clark;D. Fabel
挪威海峡的最后一次冰消期——地貌学、地层学和放射性碳测年
影响因子：
2.2
作者：
B. Morén;H. Sejrup;B. O. Hjelstuen;Marianne V. Borge;Cathrina Schäuble
通讯作者：
Cathrina Schäuble
冰流首次出现引发冰盖快速退缩：来自北海的证据
影响因子：
5.8
作者：
H. Sejrup;C. Clark;B. O. Hjelstuen
通讯作者：
B. O. Hjelstuen