The Archaean Earth - Coupling between geodynamics and 3D climate modelling

太古代地球 - 地球动力学与 3D 气候建模之间的耦合

• 批准号: 404675609
• 负责人: Dr. Ludmila Carone
• 金额: --
• 依托单位: Abteilung Planeten- und Sternentstehung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/404675609?language=en
• 关键词: Archaean; Earth; Coupling; between; geodynamics

The Archaean (3.8 - 2.5 Gyrs) is a geological eon that brought with it great transitions in the development of the habitable Earth. The atmosphere composition probably changed drastically: To explain the faint young Sun paradox at the beginning of the Archaean, an atmosphere with large amounts of greenhouse gases are needed. At the end, the atmosphere contained roughly present day atmospheric levels of greenhouse gases and started to accumulate free oxygen. The geological processes also changed drastically: Plate tectonics probably developed during the Archaean and influenced atmosphere composition via an early carbon cycle. The first continental crust that survived until today also formed and grew during the Archaean. The exposed continental crust influences the atmosphere composition, e.g. by acting as sink for carbon dioxide and oxygen via weathering processes. In this project, we will couple for the first time a 3D/1D climate and a 2D state-of-the-art mantle convection model to investigate the properties of the atmosphere (composition and extent), surface temperatures and different onset times for plate tectonics during the Archaean. We will thus address the young Sun paradox and investigate the coupled evolution of the Archaean atmosphere and geodynamics - providing new context for geological and geochemical data - from early to late Archaean. The model will incorporate rigorously and physically motivated constraints together with geological and geochemical evidence for outgassing rates, ocean temperatures, Archaean atmosphere composition, plate tectonics on-set and crustal growth during the Archaean derived by collaborators in the project "Building a Habitable Earth".

古细菌（3.8-2.5 Gyrs）是一种地质元素，在宜居地球的发展中带来了巨大的过渡。大气成分可能发生了巨大变化：为了解释古细菌开始时淡淡的年轻太阳悖论，需要大量的温室气体。最后，大气包含当今大气的温室气体水平，并开始积聚游离氧气。地质过程也发生了巨大变化：板块构造可能在古细菌期间开发，并通过早期的碳循环影响大气组成。直到今天生存下来的第一批大陆地壳也在古细菌期间形成和成长。暴露的大陆壳影响大气成分，例如通过通过风化过程充当二氧化碳和氧气的水槽。在这个项目中，我们将首次融入3D/1D气候和2D最先进的对流模型，以研究大气（组成和范围），表面温度和板块构造期间的不同发作时间。因此，我们将解决年轻的太阳悖论，并研究古细菌和地球动力学的耦合演变 - 从早期到后期的古细菌为地质和地球化学数据提供新的环境。该模型将严格，身体上动机的限制以及地质和地球化学证据，以超过燃料率，海洋温度，天生大气组成，板块构造，板块构造和地壳生长，在该项目“建造可居住地”的合作者中得出的古学生长。