Cenozoic climate: Earth system modeling and analysis

工作包5的主要目标是分析中新世中期和晚期（第一个项目期）和始新世-渐新世（第二个项目期）特定过程的气候影响。全球海洋环流的重组、植被带的大规模转移、地形变化和全球碳化学变化被认为对新生代主要气候转变起主导作用。因此，它是至关重要的，不仅要更好地了解这些单独的系统的行为，而且要调查耦合系统的完整动态，反馈和协同作用。我们将通过使用复杂地球系统模型COSMOS（见导言中的建模策略）的适当选择的组件，以及使用中等复杂性地球系统模型（EMIC）行星模拟器的敏感性研究，来解决气候系统组件之间的众多相互作用。将与WP 1、WP 3和WP 4合作进行包括协同作用在内的反馈分析。在我们的工作包中，我们考虑了大气-海洋-海冰-植被系统的动力学，重点是大尺度海洋环流，包括高纬度和季风环流的大气动力学，以及陆面效应的相对作用。通过同位素建模和统计工具，将中新世中期和晚期的气候情景与代用数据进行了比较。模拟还提供了一个框架，以了解全球能源预算和遥相关的气候条件，这大大偏离了现在。

The major objectives of the Work Package 5 are to analyse the climatic effects of specific processes for the Mid- and Late Miocene (first project period) and the Eocene-Oligocene (second project period). Reorganizations of the global ocean circulation, large-scale shifts of vegetation zones, topographical changes and changes in the global carbon chemistry are supposed to play a dominant role for the major Cenozoic climate transitions. Consequently, it is of utmost importance not only to understand the behaviour of these individual systems in better detail but also to investigate the full dynamics, feedbacks, and synergisms of the coupled system. We will address the numerous interactions between the climate system components by use of suitably choosen components of the complex Earth System Model COSMOS (see Modelling Strategy in the introduction), accompanied by sensitivity studies using the Earth System Model of intermediate complexity (EMIC) Planet Simulator. Feedback analysis including synergisms will be performed in cooperation with WP1, WP3 and WP4. In our work package, we consider the dynamics of the atmosphere-ocean-sea ice-vegetation system with focus on the relative roles of the large-scale ocean circulation, the atmospheric dynamics including high latitude and monsoon circulation, as well as land surface effects. Climate scenarios for the Mid- and Late Miocene are compared with proxy data, both through isotope modelling and statistical tools. The simulations provide furthermore a framework to understand global energy budgets and teleconnections for climate conditions, which strongly deviate from the present.