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".

太古宙(3.8-2.5旋回)是一个地质时代，它带来了宜居地球发展的巨大转变。大气层的组成可能发生了巨大的变化：为了解释太古代初微弱的年轻太阳悖论，需要一个含有大量温室气体的大气层。最后，大气中的温室气体含量大致相当于现在的水平，并开始积累自由氧气。地质过程也发生了巨大变化：板块构造可能是在太古宙期间发展起来的，并通过早期的碳循环影响了大气成分。第一个幸存至今的陆壳也是在太古宙期间形成和生长的。裸露的陆壳影响大气成分，例如，通过风化过程充当二氧化碳和氧气的汇。在这个项目中，我们将首次将3D/1D气候和2D最先进的地幔对流模型结合起来，以研究太古代期间大气的性质(成分和程度)、表面温度和板块构造的不同起始时间。因此，我们将讨论年轻的太阳悖论，并研究太古代大气和地球动力学的耦合演化--为地质和地球化学数据提供新的背景--从太古宙早期到晚太古代。该模型将纳入严格的和实际驱动的约束，以及关于太古代放气速率、海洋温度、太古代大气成分、现场板块构造和太古代地壳生长的地质和地球化学证据，这些证据是由“建设宜居地球”项目的合作者得出的。