气候变化领域集成服务门户(CCPortal): The transferability of adjoint inversion products between different ice flow models

CCPortal

DOI	10.5194/tc-15-1975-2021
	The transferability of adjoint inversion products between different ice flow models
	Barnes J.M.; Dias Dos Santos T.; Goldberg D.; Hilmar Gudmundsson G.; Morlighem M.; De Rydt J.
发表日期	2021
ISSN	19940416
起始页码	1975
结束页码	2000
卷号	15 期号:4
英文摘要	Among the most important challenges faced by ice flow models is how to represent basal and rheological conditions, which are challenging to obtain from direct observations. A common practice is to use numerical inversions to calculate estimates for the unknown properties, but there are many possible methods and not one standardised approach. As such, every ice flow model has a unique initialisation procedure. Here we compare the outputs of inversions from three different ice flow models, each employing a variant of adjoint-based optimisation to calculate basal sliding coefficients and flow rate factors using the same observed surface velocities and ice thickness distribution. The region we focus on is the Amundsen Sea Embayment in West Antarctica, the subject of much investigation due to rapid changes in the area over recent decades. We find that our inversions produce similar distributions of basal sliding across all models, despite using different techniques, implying that the methods used are highly robust and represent the physical equations without much influence by individual model behaviours. Transferring the products of inversions between models results in time-dependent simulations displaying variability on the order of or lower than existing model intercomparisons. Focusing on contributions to sea level, the highest variability we find in simulations run in the same model with different inversion products is 32 %, over a 40-year period, a difference of 3.67 >mm<. There is potential for this to be improved with further standardisation of modelling processes, and the lowest variability within a single model is 13 %, or 1.82 >mm< over 40 years. While the successful transfer of inversion outputs from one model to another requires some extra effort and technical knowledge of the particular models involved, it is certainly possible and could indeed be useful for future intercomparison projects. © 2021 BMJ Publishing Group. All rights reserved.
英文关键词	flow measurement; flow modeling; ice flow; ice thickness; sliding; Amundsen Sea; Antarctica; Southern Ocean; West Antarctica
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202271
作者单位	Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom; Department of Earth System Science, University of California, Irvine, CA, United States; Centro Polar e Climático, Universidade Federal Do Rio Grande Do sul, Porto Alegre, RS, Brazil; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom
推荐引用方式 GB/T 7714	Barnes J.M.,Dias Dos Santos T.,Goldberg D.,et al. The transferability of adjoint inversion products between different ice flow models[J],2021,15(4).
APA	Barnes J.M.,Dias Dos Santos T.,Goldberg D.,Hilmar Gudmundsson G.,Morlighem M.,&De Rydt J..(2021).The transferability of adjoint inversion products between different ice flow models.Cryosphere,15(4).
MLA	Barnes J.M.,et al."The transferability of adjoint inversion products between different ice flow models".Cryosphere 15.4(2021).