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Anisotropic sea ice mechanics in the Arctic

北极的各向异性海冰力学

基本信息

批准号：
NE/K011510/1
负责人：
Daniel Feltham
金额：
$ 36.88万
依托单位：
University of Reading
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FK011510%2F1
关键词：
Anisotropic sea ice mechanics Arctic

项目摘要

In response to global warming, the ice covers of the Arctic and Antarctic are changing, with a significant reduction in the summer extent of Arctic sea ice. The observed recent, rapid reduction of Arctic sea ice is more extreme than the predictions of even the most pessimistic of climate models, which suggests that these models do not present the processes controlling the reduction of sea ice adequately. Satellite observations, field work, and modelling all point to the importance of sea ice dynamics in controlling the mass balance of Arctic sea ice. The greatest uncertainty in sea ice dynamics is in the relationship between internal sea ice stresses and the deformation and state of the sea ice cover, known as the sea ice rheology.The description of sea ice rheology in existing climate models treats the ice cover as isotropic, so that at a given location there is equal resistance to failure in all directions. However, it has been known for over a decade that the ice cover is highly anisotropic, with oriented cracks present at all length scales, and these cracks control the directions of preferential deformation. While researchers have been aware of the importance of anisotropic mechanics, only recently has a model of anisotropic rheology been constructed and incorporated into the sea ice component of a climate model. This project aims to eliminate fundamental uncertainty in the processes controlling anisotropy creation and destruction through a combination of recently produced, high-resolution satellite deformation maps and computer modelling. A major result of the research will be a new representation of anisotropic sea ice rheology incorporated into the CICE sea ice model, which is the sea ice model used in many climate models, including the UK Hadley Centre series of climate models. We will use CICE to investigate the role of anisotropic rheology in producing the recent and rapid reduction of Arctic sea ice.

为了应对全球变暖，北极和南极的冰盖正在发生变化，北极海冰的夏季范围大幅减少。最近观测到的北极海冰迅速减少的情况甚至比最悲观的气候模型的预测更为极端，这表明这些模型没有充分展示控制海冰减少的过程。卫星观测、实地工作和建模都指出了海冰动力学在控制北极海冰质量平衡方面的重要性。海冰动力学中最大的不确定性在于海冰内部应力与海冰覆盖层的变形和状态之间的关系，称为海冰流变学。现有气候模式中对海冰流变学的描述将冰盖视为各向同性，因此在给定位置，各个方向的破坏阻力相等。然而，人们已经知道，十多年来，冰盖是高度各向异性的，与定向裂缝存在于所有的长度尺度，这些裂缝控制的方向优先变形。虽然研究人员已经意识到各向异性力学的重要性，但直到最近才构建了各向异性流变学模型，并将其纳入气候模型的海冰部分。该项目的目的是通过结合最近制作的高分辨率卫星变形图和计算机建模，消除控制各向异性产生和破坏过程中的根本不确定性。该研究的一个主要成果将是将各向异性海冰流变学的新表示纳入CICE海冰模型，该模型是许多气候模型中使用的海冰模型，包括英国哈德利中心系列气候模型。我们将使用CICE来研究各向异性流变学在北极海冰最近快速减少中的作用。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Characterizing Arctic sea ice topography using high-resolution IceBridge data.

使用高分辨率冰桥数据表征北极海冰地形。

DOI：
10.5194/tc-10-1161-2016
发表时间：
2016
期刊：
The cryosphere
影响因子：
0
作者：
Petty A
通讯作者：
Petty A

Micromechanics of sea ice frictional slip from test basin scale experiments.

试验盆规模实验中海冰摩擦滑移的微观力学。

DOI：
10.1098/rsta.2015.0354
发表时间：
2017
期刊：
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
影响因子：
0
作者：
Sammonds PR
通讯作者：
Sammonds PR

Warm Winter, Thin Ice?

暖冬，薄冰？

DOI：
10.5194/tc-2017-287
发表时间：
2018
期刊：
影响因子：
0
作者：
Stroeve J
通讯作者：
Stroeve J

Stress and deformation characteristics of sea ice in a high-resolution, anisotropic sea ice model.

DOI：
10.1098/rsta.2017.0349
发表时间：
2018-09-28
期刊：
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
影响因子：
0
作者：
Heorton HDBS;Feltham DL;Tsamados M
通讯作者：
Tsamados M