大气温室气体、轨道参数和southern ocean网关的作用：理想模式研究
The role of atmospheric greenhouse gases, orbital parameters, and southern ocean gateways: an idealized model study
摘要：
一组理想化的实验进行分析大气中二氧化碳浓度下降，海洋门户的开放，和不同的轨道参数的竞争效应。这些影响全球平均气候状态的强迫机制可能在触发过去的气候转变方面发挥了作用（例如在始新世-渐新世气候转变和南极冰盖的形成期间）。利用一个海气耦合环流模式对这三种强迫及其对全球气候的作用进行了敏感性模拟。模拟是在理想条件下进行的，以集中于要点。这三种强迫的结合引发了类似于南极冰川作用开始的气候转变。特别是南方高纬度地区气温下降，积雪不断堆积。此外，每个可能的强迫的相对重要性进行了探讨。所有这三种机制（大气中二氧化碳的减少、海洋门户的打开和轨道参数的改变）都使南极大陆的气候变冷。由轨道参数引起的变化强烈地依赖于结晶度变化的大小。
英文摘要：
A set of idealized experiments are performed to analyze the competing effects of declining atmospheric CO2 concentrations, the opening of an ocean gateway, and varying orbital parameters. These forcing mechanisms, which influence the global mean climate state, may have played a role for triggering climate transitions of the past (for example during the Eocene-Oligocene climate transition and the build-up of the Antarctic Ice Sheet). Sensitivity simulations with a coupled atmosphere-ocean general circulation model are conducted to test these three forcings and their roles for the global climate. The simulations are carried out under idealized conditions to focus on the essentials. The combination of all three forcings triggers a climate transition which resembles the onset of the Antarctic glaciation. In particular, the temperatures in the southern high latitudes decrease and snow accumulates constantly. Moreover, the relative importance of each possible forcing is explored. All three of the mechanisms (atmospheric CO2 decrease, opening of the ocean gateways, and changing orbital parameters) cool the climate of the southern polar continent. The change induced by the orbital parameters depends strongly on the magnitude of the change in obliquity.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
