Shelf ice - ocean dynamics and their interaction in the vicinity of ice rumples: A coupled 3D-model and application to selected Antarctic regions

陆架冰 - 海洋动力学及其在冰皱附近的相互作用：耦合 3D 模型及其在选定南极地区的应用

• 批准号: 26948946
• 负责人: Professor Dr. Manfred A. Lange
• 金额: --
• 依托单位: Energy, Environment and Water Research Center (EEWRC)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26948946?language=en
• 关键词: Shelf; ice; ocean; dynamics; their

By the Larsen Ice Shelf collapse at the Antarctic Peninsula during the last decade, it is well-known that ice shelves react sensitively to climate change. The stability of ice shelves depends on the existence of embayments and is largely influenced by ice rises and ice rumples acting as pinning points. Due to their smaller spatial extent, ice rumples react more sensitively to climate change than ice rises. This study will elucidate the role of ice rumples in the context of climate change impacts on Antarctic ice shelves. An increased surface accumulation will probably lead to thickening and thus more stable conditions of the ice shelves, while ocean warming and increasing surface temperatures will presumably lead to thinning ice shelves. In addition, sea-level rise can cause a total disintegration as a result of changed conditions at the contact between ice-shelf base and bedrock. This project strives to investigate the combined effects of these four processes. Our comprehensive investigation will include all components in the vicinity of an ice rumple: the ice shelf, the ocean and the grounded ice portion. We will improve and couple three existing numerical models for grounded ice bodies, ice shelves, and ocean, respectively. The resulting model package will be applied to selected regions of the Weddell or Ross Sea sector under different plausible climate scenarios. A comparison to results of previous uncoupled models will be carried out.

在过去的十年中，南极半岛的拉森冰架崩塌，众所周知，冰架对气候变化反应敏感。冰架的稳定性取决于河口的存在，并在很大程度上受到起固定点作用的冰升和冰皱的影响。由于其较小的空间范围，冰皱比冰升对气候变化的反应更敏感。本研究将阐明在气候变化对南极冰架影响的背景下，冰皱的作用。表面积累的增加可能会导致冰架变厚，从而使冰架的状况更加稳定，而海洋变暖和表面温度的升高可能会导致冰架变薄。此外，由于冰架底部和基岩接触处的条件发生了变化，海平面上升可能导致冰架完全解体。本项目致力于研究这四个过程的综合影响。我们的全面调查将包括冰堆附近的所有组成部分：冰架、海洋和接地冰部分。我们将分别对地面冰体、冰架和海洋三个现有的数值模型进行改进和耦合。由此产生的整套模型将应用于威德尔或罗斯海地区在不同可能的气候情景下的选定地区。将与以前的非耦合模型的结果进行比较。