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Recent progress on combining geomorphological and geochronological data with ice sheet modelling, demonstrated using the last British–Irish Ice Sheet
Journal of Quaternary Science ( IF 1.9 ) Pub Date : 2019-07-12 , DOI: 10.1002/jqs.3098
Jeremy C. Ely 1 , Chris D. Clark 1 , Richard C. A. Hindmarsh 2 , Anna L. C. Hughes 3 , Sarah L. Greenwood 4 , Sarah L. Bradley 5 , Edward Gasson 6 , Lauren Gregoire 7 , Niall Gandy 7 , Chris R. Stokes 8 , David Small 8
Affiliation  

Palaeo-ice sheets are important analogues for understanding contemporary ice sheets, offering a record of ice sheet behaviour that spans millennia. There are two main approaches to reconstructing palaeo-ice sheets. Empirical reconstructions use the available glacial geological and chronological evidence to estimate ice sheet extent and dynamics but lack direct consideration of ice physics. In contrast, numerically modelled simulations implement ice physics, but often lack direct quantitative comparison with empirical evidence. Despite being long identified as a fruitful scientific endeavour, few ice sheet reconstructions attempt to reconcile the empirical and model-based approaches. To achieve this goal, model-data comparison procedures are required. Here, we compare three numerically modelled simulations of the former British–Irish Ice Sheet with the following lines of evidence: (a) position and shape of former margin positions, recorded by moraines; (b) former ice-flow direction and flow-switching, recorded by flowsets of subglacial bedforms; and (c) the timing of ice-free conditions, recorded by geochronological data. These model–data comparisons provide a useful framework for quantifying the degree of fit between numerical model simulations and empirical constraints. Such tools are vital for reconciling numerical modelling and empirical evidence, the combination of which will lead to more robust palaeo-ice sheet reconstructions with greater explicative and ultimately predictive power.

中文翻译:

结合地貌和地质年代数据与冰盖建模的最新进展,使用最后一个英国 - 爱尔兰冰盖展示

古冰盖是理解当代冰盖的重要类似物,提供了跨越数千年的冰盖行为记录。重建古冰盖有两种主要方法。经验重建使用可用的冰川地质和年代证据来估计冰盖范围和动力学,但缺乏对冰物理的直接考虑。相比之下,数值模拟的模拟实现了冰物理,但往往缺乏与经验证据的直接定量比较。尽管长期以来被认为是一项富有成果的科学努力,但很少有冰盖重建试图调和经验和基于模型的方法。为了实现这一目标,需要模型数据比较程序。这里,我们将前英国 - 爱尔兰冰盖的三个数值模拟模拟与以下证据进行了比较:(a)由冰碛记录的前边缘位置的位置和形状;(b) 以前的冰流方向和流动切换,由冰下床型的流集记录;(c) 无冰条件的时间,由地质年代学数据记录。这些模型-数据比较为量化数值模型模拟和经验约束之间的拟合程度提供了一个有用的框架。这些工具对于协调数值建模和经验证据至关重要,两者的结合将导致更强大的古冰盖重建具有更大的解释力和最终预测能力。(b) 以前的冰流方向和流动切换,由冰下床型的流集记录;(c) 无冰条件的时间,由地质年代学数据记录。这些模型-数据比较为量化数值模型模拟和经验约束之间的拟合程度提供了一个有用的框架。这些工具对于协调数值建模和经验证据至关重要,两者的结合将导致更强大的古冰盖重建具有更大的解释力和最终预测能力。(b) 以前的冰流方向和流动切换,由冰下床型的流集记录;(c) 无冰条件的时间,由地质年代学数据记录。这些模型-数据比较为量化数值模型模拟和经验约束之间的拟合程度提供了一个有用的框架。这些工具对于协调数值建模和经验证据至关重要,两者的结合将导致更强大的古冰盖重建具有更大的解释力和最终预测能力。这些模型-数据比较为量化数值模型模拟和经验约束之间的拟合程度提供了一个有用的框架。这些工具对于协调数值建模和经验证据至关重要,两者的结合将导致更强大的古冰盖重建具有更大的解释力和最终预测能力。这些模型-数据比较为量化数值模型模拟和经验约束之间的拟合程度提供了一个有用的框架。这些工具对于协调数值建模和经验证据至关重要,两者的结合将导致更强大的古冰盖重建具有更大的解释力和最终预测能力。
更新日期:2019-07-12
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