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.

为了响应全球变暖，北极和南极的冰盖正在发生变化，北极海冰的夏季程度大大减少。观察到的北极海冰的最新快速减少比对气候模型的最悲观的预测更为极端，这表明这些模型没有充分控制海冰还原的过程。卫星观测，现场工作和建模所有指向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内部海冰应力与海冰覆盖状态的变形和状态之间的关系，称为海冰流变学。，因此，在给定的位置，各个方向都具有相等的抵抗力。然而，已经知道了十多年的冰盖是高度各向异性的，并且在各个长度上都存在定向的裂纹，并且这些裂纹控制着优先变形的方向。尽管研究人员已经意识到各向异性力学的重要性，但直到最近才建立了各向异性流变学模型，并将其纳入气候模型的海冰组成部分。该项目旨在通过结合最近生产的高分辨率卫星变形图和计算机建模的结合来消除控制各向异性创造和破坏的过程中的基本不确定性。这项研究的主要结果将是将各向异性海冰流变学的新代表纳入了CICE海冰模型，这是许多气候模型中使用的海冰模型，包括英国Hadley中心系列气候模型。我们将使用CICE研究各向异性流变学在产生北极海冰最近和快速减少的作用。

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

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

Warm Winter, Thin Ice?

暖冬，薄冰？