Cenozoic Antarctic glaciation: An integrated atmosphere - Ocean - Ice Sheet Model Approach

新生代南极冰川作用：综合大气-海洋-冰盖模型方法

• 批准号: 27462663
• 负责人: Dr. Martin Butzin
• 金额: --
• 依托单位: Alfred-Wegener-Institut (AWI) Helmholtz-Zentrum für Polar- und Meeresforschung
• 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 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/27462663?language=en
• 关键词: Cenozoic; Antarctic; glaciation; integrated; atmosphere

The widespread glaciation of Antarctica and the associated shift towards colder temperatures at the Eocene-Oligocene boundary (about 35 million years ago) represents one of the most fundamental reorganisations of global climate in the earth s history. During the same time, the opening of the Southern Ocean gateways, the Drake Passage and the Tasman Gateway, led to the formation of the Antarctic Circumpolar Current and hence to the isolation of the Antarctic continent. Apart from the oceanic regime, other global phenomena such as the declining atmospheric carbon dioxide concentration and the orbital configuration, contributed to the onset of a persistent Antarctic glaciation. With this project we address the impact of each of these processes on the formation of the Antarctic Ice Sheet. We put special emphasis on the ocean circulation, latent heat transport as well as on ice sheet dynamics in an integrated modelling approach. Shifts in atmospheric circulation, temperature changes, and snow accumulation over Antarctica and their forcing factors will be analysed in detail. The identification of thresholds for the Antarctic ice sheet development will yield novel views for palaeoclimatic records at the Eocene-Oligocene transition.

南极洲广泛的冰川作用以及始新世-渐新世边界（约3500万年前）向更冷温度的转变代表了地球历史上全球气候最根本的重组之一。在同一时期，南大洋门户德雷克海峡和塔斯曼门户的开放导致了南极绕极流的形成，从而导致了南极大陆的孤立。除海洋状况外，大气中二氧化碳浓度下降和轨道结构等其他全球现象也促成了南极持续冰川作用的开始。通过这个项目，我们解决了这些过程中的每一个对南极冰盖形成的影响。我们特别强调海洋环流，潜热输送以及冰盖动力学的综合建模方法。将详细分析南极上空大气环流的变化、温度变化和积雪及其影响因素。确定南极冰盖发展的阈值将为始新世-渐新世过渡期的古气候记录提供新的视角。